Download this notebook from github.

---

A notebook to illustrate how to compute and correct Impulse Response in IW SLC product

compute IW1 impulse response

import warnings
warnings.filterwarnings("ignore")
from xsarslc.processing.impulseResponse import generate_IWS_AUX_file_ImpulseReponse
# SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/WV/S1A\_WV\_SLC\_\_1S/2018/050/S1A\_WV\_SLC\_\_1SSV\_20180219T221522\_20180219T222851\_020681\_0236CE\_8F55.SAFE:WV_051
subswathes = {'/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/271/S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE/':[1],
             }
subswath_number = 1

IRs_IW1_VV = generate_IWS_AUX_file_ImpulseReponse(subswathes, subswath_number , polarization='VV')

IRs_IW1_VV
IRs_IW1_VH = generate_IWS_AUX_file_ImpulseReponse(subswathes, subswath_number , polarization='VH')
IRs_IW1_VH

<xarray.Dataset> Size: 37kB
Dimensions:         (k_srg: 2048, k_az: 256)
Coordinates:
    pol             <U2 8B 'VH'
  * k_srg           (k_srg) float64 16kB -1.349 -1.347 -1.346 ... 1.346 1.347
  * k_az            (k_az) float64 2kB -0.2236 -0.2219 -0.2201 ... 0.2201 0.2219
Data variables:
    range_IR        (k_srg) float64 16kB 0.0006532 0.000653 ... 0.0006555
    mean_incidence  float64 8B 33.5
    azimuth_IR      (k_az) float64 2kB 0.002633 0.002634 ... 0.002637 0.002631
Attributes: (12/21)
    long_name:              Impulse response in range direction
    name:                   SENTINEL1_DS:/home/datawork-cersat-public/cache/p...
    short_name:             SENTINEL1_DS:S1A_IW_SLC__1SDV_20220928T095555_202...
    product:                SLC
    safe:                   S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_...
    swath:                  IW
    ...                     ...
    platform_heading:       -168.0316299165244
    comment:                denoised digital number, read at full resolution
    history:                digital_number: measurement/s1a-iw1-slc-v*-202209...
    radar_frequency:        5405000454.33435
    azimuth_time_interval:  0.002055556299999998
    subswath:               IW1

xarray.Dataset

• Dimensions:
  • k_srg: 2048
  • k_az: 256
• Coordinates: (3)
  • pol
    ()
    <U2
    'VH'

    array('VH', dtype='<U2')

  • k_srg
    (k_srg)
    float64
    -1.349 -1.347 ... 1.346 1.347

    long_name :

    wavenumber in slant range direction

    units :

    rad/m

    array([-1.348577, -1.34726 , -1.345943, ...,  1.344626,  1.345943,  1.34726 ])

  • k_az
    (k_az)
    float64
    -0.2236 -0.2219 ... 0.2201 0.2219

    long_name :

    wavenumber in azimuth direction

    units :

    rad/m

    array([-0.223626, -0.221879, -0.220132, ...,  0.218385,  0.220132,  0.221879])

• Data variables: (3)
  • range_IR
    (k_srg)
    float64
    0.0006532 0.000653 ... 0.0006555

    array([0.00065318, 0.00065297, 0.0006538 , ..., 0.00065617, 0.00065434,
           0.00065545])

  • mean_incidence
    ()
    float64
    33.5

    long_name :

    incidence at middle tile

    units :

    degree

    array(33.49548951)

  • azimuth_IR
    (k_az)
    float64
    0.002633 0.002634 ... 0.002631

    array([0.00263291, 0.00263436, 0.00263818, 0.00264205, 0.00265105,
           0.00266041, 0.00267208, 0.00268831, 0.00270652, 0.00272508,
           0.00275141, 0.00277531, 0.00280138, 0.00283636, 0.00287302,
           0.00291237, 0.00295736, 0.00300619, 0.00306046, 0.00311955,
           0.00318378, 0.003257  , 0.00333786, 0.00342369, 0.00352235,
           0.00363847, 0.00376266, 0.00390062, 0.00406006, 0.00424451,
           0.00445841, 0.00470459, 0.00499975, 0.00535286, 0.00579321,
           0.00634149, 0.00705897, 0.00803661, 0.00945346, 0.0117083 ,
           0.01591069, 0.02849958, 0.15020518, 0.4996229 , 0.67984825,
           0.68806996, 0.67513524, 0.67041504, 0.6611402 , 0.65977103,
           0.65365037, 0.64952384, 0.65222048, 0.6553592 , 0.65650046,
           0.659653  , 0.66754272, 0.67425239, 0.68196459, 0.69540784,
           0.70641276, 0.71585662, 0.73053674, 0.74578385, 0.76272116,
           0.78057055, 0.79669336, 0.81699884, 0.84018231, 0.85898676,
           0.88735214, 0.91380964, 0.94384396, 0.96347602, 0.99154193,
           1.02273283, 1.0479031 , 1.08038523, 1.11286678, 1.15098875,
           1.18436572, 1.21158808, 1.24474358, 1.27676433, 1.31828394,
           1.3541939 , 1.39108993, 1.43340141, 1.47170112, 1.5120505 ,
           1.55243531, 1.59554475, 1.63902263, 1.67230157, 1.71593087,
           1.7535696 , 1.79849479, 1.84444776, 1.87991013, 1.91924111,
    ...
           1.80908676, 1.76034823, 1.71731095, 1.67601611, 1.64149941,
           1.60879051, 1.56276616, 1.52054543, 1.4856599 , 1.44392367,
           1.40009218, 1.36647529, 1.33937978, 1.29241475, 1.25438408,
           1.21661781, 1.18176863, 1.1494251 , 1.12135357, 1.0887373 ,
           1.05739023, 1.02003813, 0.98993048, 0.96313483, 0.94007885,
           0.91148231, 0.89015383, 0.86930132, 0.84414485, 0.81970087,
           0.80074422, 0.77703967, 0.7622338 , 0.74714195, 0.73028554,
           0.71459371, 0.70411122, 0.69493601, 0.68172415, 0.67094877,
           0.66081148, 0.65886292, 0.65215079, 0.64824603, 0.64843188,
           0.64948724, 0.65035746, 0.65701359, 0.65690228, 0.6669102 ,
           0.67268811, 0.67688956, 0.67219607, 0.50147701, 0.14745342,
           0.02645859, 0.01563813, 0.01155644, 0.00937469, 0.00797967,
           0.00702113, 0.0063123 , 0.00576611, 0.00533688, 0.0049866 ,
           0.00469236, 0.0044451 , 0.00423471, 0.00405503, 0.00389631,
           0.00375236, 0.00363083, 0.00352414, 0.00342449, 0.00333481,
           0.00325786, 0.00318293, 0.00311742, 0.00306079, 0.00300667,
           0.00295523, 0.00291461, 0.00287201, 0.00283809, 0.00280352,
           0.0027763 , 0.00274964, 0.00272597, 0.0027066 , 0.00268706,
           0.00267319, 0.0026607 , 0.00264881, 0.00263978, 0.00263717,
           0.00263111])

• Indexes: (2)
  • k_srg
    PandasIndex

    PandasIndex(Index([-1.3485765365290956, -1.3472595672551413, -1.3459425979811872,
            -1.344625628707233, -1.3433086594332788, -1.3419916901593245,
           -1.3406747208853704, -1.3393577516114161,  -1.338040782337462,
           -1.3367238130635077,
           ...
            1.3354068437895537,  1.3367238130635077,   1.338040782337462,
            1.3393577516114161,  1.3406747208853704,  1.3419916901593245,
            1.3433086594332788,   1.344625628707233,  1.3459425979811872,
            1.3472595672551413],
          dtype='float64', name='k_srg', length=2048))

  • k_az
    PandasIndex

    PandasIndex(Index([ -0.2236262077765237, -0.22187912802826962,  -0.2201320482800155,
           -0.21838496853176143, -0.21663788878350734, -0.21489080903525323,
           -0.21314372928699915, -0.21139664953874507, -0.20964956979049096,
           -0.20790249004223688,
           ...
             0.2061554102939828,  0.20790249004223688,  0.20964956979049096,
            0.21139664953874507,  0.21314372928699915,  0.21489080903525323,
            0.21663788878350734,  0.21838496853176143,   0.2201320482800155,
            0.22187912802826962],
          dtype='float64', name='k_az', length=256))

• Attributes: (21)

  long_name :

  Impulse response in range direction

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/271/S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.52

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-09-28 09:55:57.799098

  stop_date :

  2022-09-28 09:56:22.922107

  footprint :

  POLYGON ((-62.23754368024279 -1.858692573563884, -63.01619444502543 -1.689763260246732, -63.34014112580896 -3.207344140643747, -62.56008100344361 -3.377844796320056, -62.23754368024279 -1.858692573563884))

  coverage :

  172km * 88km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -168.0316299165244

  comment :

  denoised digital number, read at full resolution

  history :

  digital_number: measurement/s1a-iw1-slc-v*-20220928t095557-20220928t095622-045203-056722-00*.tiff

  radar_frequency :

  5405000454.33435

  azimuth_time_interval :

  0.002055556299999998

  subswath :

  IW1

save IR file to netCDF

import os
out_file = "/tmp/IRs/S1_IR_IW1_VV.nc"
if not os.path.exists("/tmp/IRs/"):
    os.makedirs("/tmp/IRs/")
if 'footprint' in IRs_IW1_VV.attrs:
    IRs_IW1_VV.attrs.update({'footprint': str(IRs_IW1_VV.footprint)})
if 'multidataset' in IRs_IW1_VV.attrs:
    IRs_IW1_VV.attrs.update({'multidataset': str(IRs_IW1_VV.multidataset)})
IRs_IW1_VV.to_netcdf(out_file)
print(out_file)

/tmp/IRs/S1_IR_IW1_VV.nc

out_file = "/tmp/IRs/S1_IR_IW1_VH.nc"
if 'footprint' in IRs_IW1_VH.attrs:
    IRs_IW1_VH.attrs.update({'footprint': str(IRs_IW1_VH.footprint)})
if 'multidataset' in IRs_IW1_VH.attrs:
    IRs_IW1_VH.attrs.update({'multidataset': str(IRs_IW1_VH.multidataset)})
IRs_IW1_VH.to_netcdf(out_file)
print(out_file)

/tmp/IRs/S1_IR_IW1_VH.nc

concat IR

from xsarslc.processing.impulseResponse import merge_IR_polarization
merge_IR_polarization(IR_directory='/tmp/IRs/')

Merging Impulse Responses done

'/tmp/IRs/'

display IW1 range impulse response for VV and VH

from matplotlib import pyplot as plt
IRs_IW1_VV['range_IR'].plot(label='VV')
#IRs_IW1_VH['range_IR'].plot(label='VH',alpha=0.7)
plt.legend()
plt.grid(True)
plt.title('subswath = %s'%(IRs_IW1_VV.attrs['subswath']))
plt.show()

display IW1 azimuth impulse response for VV and VH

from matplotlib import pyplot as plt
IRs_IW1_VV['azimuth_IR'].plot(label='VV')
#IRs_IW1_VH['azimuth_IR'].plot(label='VH',alpha=0.7)
plt.legend()
plt.grid(True)
plt.title('subswath = %s'%(IRs_IW1_VV.attrs['subswath']))
plt.show()

apply IR correction when computing a cross spectra

import xsarslc
import xsar
import os
one_tiff = '/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE/measurement/s1a-iw1-slc-vv-20220507t162411-20220507t162439-043107-0525de-004.tiff'
fullpathsafeSLC = os.path.dirname(os.path.dirname(one_tiff))
imagette_number = os.path.basename(one_tiff).split('-')[1].replace('iw','')
str_gdal = 'SENTINEL1_DS:%s:IW%s'%(fullpathsafeSLC,imagette_number)
print('str_gdal',str_gdal)
xsarobj = xsar.Sentinel1Dataset(str_gdal) #,resolution='30m'
xsarobj

str_gdal SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

<Sentinel1Dataset full coverage object>

dt = xsarobj.datatree
# dt.load()
dt.load()

<xarray.DatasetView> Size: 0B
Dimensions:  ()
Data variables:
    *empty*
Attributes: (12/15)
    name:              SENTINEL1_DS:/home/datawork-cersat-public/cache/projec...
    short_name:        SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507...
    product:           SLC
    safe:              S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_04310...
    swath:             IW
    multidataset:      False
    ...                ...
    start_date:        2022-05-07 16:24:11.657511
    stop_date:         2022-05-07 16:24:39.551410
    footprint:         POLYGON ((-156.007554522451 22.11305598776757, -156.82...
    coverage:          190km * 86km (line * sample )
    orbit_pass:        Descending
    platform_heading:  -167.7204378813183

xarray.DataTree

• Groups: (13)
  <xarray.DatasetView> Size: 5GB
  Dimensions:         (pol: 2, line: 14900, sample: 20566)
  Coordinates:
    * line            (line) int64 119kB 0 1 2 3 4 ... 14896 14897 14898 14899
    * sample          (sample) int64 165kB 0 1 2 3 4 ... 20562 20563 20564 20565
    * pol             (pol) object 16B 'VV' 'VH'
  Data variables:
      digital_number  (pol, line, sample) complex64 5GB 0j 0j 0j 0j ... 0j 0j 0j
      time            (line) datetime64[ns] 119kB 2022-05-07T16:24:11.657340 .....
      sampleSpacing   float64 8B 2.33
      lineSpacing     float64 8B 14.0
  Attributes: (12/15)
      name:              SENTINEL1_DS:/home/datawork-cersat-public/cache/projec...
      short_name:        SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507...
      product:           SLC
      safe:              S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_04310...
      swath:             IW
      multidataset:      False
      ...                ...
      start_date:        2022-05-07 16:24:11.657511
      stop_date:         2022-05-07 16:24:39.551410
      footprint:         POLYGON ((-156.007554522451 22.11305598776757, -156.82...
      coverage:          190km * 86km (line * sample )
      orbit_pass:        Descending
      platform_heading:  -167.7204378813183

  measurement

  • Groups: (0)
  • Dimensions:
    • pol: 2
    • line: 14900
    • sample: 20566
  • Coordinates: (3)
    • line
      (line)
      int64
      0 1 2 3 ... 14896 14897 14898 14899

      array([    0,     1,     2, ..., 14897, 14898, 14899])

    • sample
      (sample)
      int64
      0 1 2 3 ... 20562 20563 20564 20565

      array([    0,     1,     2, ..., 20563, 20564, 20565])

    • pol
      (pol)
      object
      'VV' 'VH'

      array(['VV', 'VH'], dtype=object)

  • Data variables: (4)
    • digital_number
      (pol, line, sample)
      complex64
      0j 0j 0j 0j 0j ... 0j 0j 0j 0j 0j

      comment :

      denoised digital number, read at full resolution

      history :

      digital_number: measurement/s1a-iw1-slc-v*-20220507t162411-20220507t162439-043107-0525de-00*.tiff

      array([[[ 0.+0.j,  0.+0.j,  0.+0.j, ...,  1.-2.j,  0.-4.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  2.+0.j,  2.-5.j,  2.-2.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+1.j,  1.-1.j,  2.-1.j],
              ...,
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j]],
      
             [[ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+1.j, -2.+0.j, -1.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ..., -1.+1.j, -1.+1.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ..., -2.+0.j,  0.+2.j,  0.+1.j],
              ...,
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
              [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j]]],
            dtype=complex64)

    • time
      (line)
      datetime64[ns]
      2022-05-07T16:24:11.657340 ... 2...

      description :

      azimuth times interpolated along line dimension at the middle of range dimension

      array(['2022-05-07T16:24:11.657340000', '2022-05-07T16:24:11.659395556',
             '2022-05-07T16:24:11.661451112', ...,
             '2022-05-07T16:24:39.547127772', '2022-05-07T16:24:39.549183328',
             '2022-05-07T16:24:39.551238884'], dtype='datetime64[ns]')

    • sampleSpacing
      ()
      float64
      2.33

      units :

      m

      referential :

      slant

      array(2.329562)

    • lineSpacing
      ()
      float64
      14.0

      units :

      m

      array(14.00234)

  • Attributes: (15)

    name :

    SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

    short_name :

    SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

    product :

    SLC

    safe :

    S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE

    swath :

    IW

    multidataset :

    False

    ipf :

    3.51

    platform :

    SENTINEL-1A

    pols :

    VV VH

    start_date :

    2022-05-07 16:24:11.657511

    stop_date :

    2022-05-07 16:24:39.551410

    footprint :

    POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

    coverage :

    190km * 86km (line * sample )

    orbit_pass :

    Descending

    platform_heading :

    -167.7204378813183

  <xarray.DatasetView> Size: 15kB
  Dimensions:            (line: 11, sample: 21)
  Coordinates:
    * line               (line) int64 88B 0 1490 2980 4470 ... 11920 13410 14899
    * sample             (sample) int64 168B 0 1029 2058 ... 18522 19551 20565
  Data variables:
      longitude          (line, sample) float64 2kB -156.0 -156.1 ... -157.2
      latitude           (line, sample) float64 2kB 22.11 22.12 ... 20.57 20.58
      height             (line, sample) float64 2kB 9.791e-05 ... 6.201e-05
      azimuthTime        (line, sample) datetime64[ns] 2kB 2022-05-07T16:24:11....
      slantRangeTime     (line, sample) float64 2kB 0.005331 0.005347 ... 0.005651
      incidenceAngle     (line, sample) float64 2kB 30.8 31.13 ... 36.34 36.59
      elevationAngle     (line, sample) float64 2kB 27.49 27.77 ... 32.28 32.5
      offboresightAngle  (line, sample) float64 2kB 26.72 27.0 ... 31.5 31.72
  Attributes:
      footprint:         POLYGON ((-156.007554522451 22.11305598776757, -156.82...
      coverage:          190km * 86km (line * sample )
      approx_transform:  |-0.00,-0.00,-156.02|\n|-0.00, 0.00, 22.12|\n| 0.00, 0...
      history:           annotations

  geolocation_annotation

  • Groups: (0)
  • Dimensions:
    • line: 11
    • sample: 21
  • Coordinates: (2)
    • line
      (line)
      int64
      0 1490 2980 ... 11920 13410 14899

      array([    0,  1490,  2980,  4470,  5960,  7450,  8940, 10430, 11920, 13410,
             14899])

    • sample
      (sample)
      int64
      0 1029 2058 ... 18522 19551 20565

      array([    0,  1029,  2058,  3087,  4116,  5145,  6174,  7203,  8232,  9261,
             10290, 11319, 12348, 13377, 14406, 15435, 16464, 17493, 18522, 19551,
             20565])

  • Data variables: (8)
    • longitude
      (line, sample)
      float64
      -156.0 -156.1 ... -157.1 -157.2

      history :

      longitude: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/longitude

      definition :

      Geodetic longitude of grid point [degrees].

      array([[-156.00755452, -156.05183268, -156.09570225, -156.13917803,
              -156.18227398, -156.22500332, -156.26737852, -156.30941144,
              -156.35111328, -156.39249471, -156.43356586, -156.47433636,
              -156.51481539, -156.55501169, -156.5949336 , -156.63458908,
              -156.67398575, -156.71313087, -156.75203142, -156.79069405,
              -156.82856657],
             [-156.04274687, -156.08696993, -156.13078494, -156.17420666,
              -156.21724906, -156.25992531, -156.30224788, -156.3442286 ,
              -156.38587868, -156.42720875, -156.46822893, -156.50894884,
              -156.54937765, -156.58952408, -156.62939648, -156.66900277,
              -156.70835058, -156.74744715, -156.78629946, -156.82491414,
              -156.86273969],
             [-156.07793695, -156.12210541, -156.16586635, -156.20923451,
              -156.25222384, -156.29484748, -156.33711789, -156.37904689,
              -156.42064566, -156.46192483, -156.5028945 , -156.54356428,
              -156.58394332, -156.62404033, -156.66386364, -156.7034212 ,
              -156.74272057, -156.78176903, -156.82057351, -156.85914067,
              -156.89691965],
             [-156.11309896, -156.15721337, -156.20092077, -156.2442359 ,
              -156.28717267, -156.32974422, -156.37196299, -156.41384077,
      ...
              -156.91430431, -156.95311907, -156.99169131, -157.03002764,
              -157.0675805 ],
             [-156.29635666, -156.34010951, -156.37793295, -156.42336339,
              -156.46599177, -156.51295038, -156.5548144 , -156.59634257,
              -156.63754585, -156.66979743, -156.71047422, -156.75085328,
              -156.79094371, -156.83075414, -156.87029283, -156.90956766,
              -156.94858616, -156.98735553, -157.02588265, -157.06417413,
              -157.10168307],
             [-156.33869954, -156.37114604, -156.41449662, -156.4538189 ,
              -156.49645103, -156.53872061, -156.58063997, -156.62222081,
              -156.66347421, -156.70441072, -156.74504032, -156.78537256,
              -156.82541648, -156.86518073, -156.90467356, -156.94390284,
              -156.98287607, -157.02160047, -157.06008289, -157.09832994,
              -157.13579535],
             [-156.36242177, -156.40616708, -156.44950891, -156.49246186,
              -156.53503969, -156.57725544, -156.61912143, -156.66064934,
              -156.70185023, -156.74273462, -156.78331252, -156.82359341,
              -156.86358637, -156.90330001, -156.94274257, -156.9819219 ,
              -157.02084553, -157.05952062, -157.09795404, -157.13615239,
              -157.17357008]])

    • latitude
      (line, sample)
      float64
      22.11 22.12 22.13 ... 20.57 20.58

      history :

      latitude: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/latitude

      definition :

      Geodetic latitude of grid point [degrees].

      array([[22.11305599, 22.12112428, 22.12910538, 22.13700234, 22.14481802,
              22.15255514, 22.16021626, 22.1678038 , 22.17532008, 22.18276728,
              22.19014749, 22.19746268, 22.20471473, 22.21190545, 22.21903654,
              22.22610965, 22.23312633, 22.24008807, 22.24699631, 22.25385241,
              22.26055885],
             [21.94657074, 21.95464234, 21.96262684, 21.97052727, 21.9783465 ,
              21.98608723, 21.99375204, 22.00134335, 22.00886346, 22.01631456,
              22.02369872, 22.03101794, 22.03827408, 22.04546895, 22.05260425,
              22.05968162, 22.06670262, 22.07366875, 22.08058143, 22.08744202,
              22.09415293],
             [21.7799558 , 21.78803076, 21.79601869, 21.80392263, 21.81174544,
              21.81948984, 21.82715838, 21.83475348, 21.84227746, 21.84973249,
              21.85712066, 21.86444393, 21.8717042 , 21.87890324, 21.88604279,
              21.89312446, 21.90014982, 21.90712036, 21.9140375 , 21.92090262,
              21.9276181 ],
             [21.61333545, 21.6214138 , 21.6294052 , 21.63731269, 21.64513913,
              21.65288722, 21.66055953, 21.66815846, 21.67568634, 21.68314534,
              21.69053754, 21.6978649 , 21.70512932, 21.71233259, 21.7194764 ,
              21.72656241, 21.73359215, 21.74056713, 21.74748877, 21.75435844,
              21.7610784 ],
      ...
             [20.94667604, 20.95476836, 20.96277405, 20.97069611, 20.97853741,
              20.98630065, 20.99398837, 21.00160299, 21.00914682, 21.01662202,
              21.02403066, 21.03137473, 21.03865608, 21.04587651, 21.05303773,
              21.06014135, 21.06718894, 21.07418198, 21.0811219 , 21.08801005,
              21.09474842],
             [20.78134282, 20.78941829, 20.79639181, 20.80475251, 20.81258664,
              20.8212015 , 20.82887173, 20.83646957, 20.84399728, 20.84988573,
              20.85729857, 20.86464688, 20.87193255, 20.87915735, 20.886323  ,
              20.8934311 , 20.90048322, 20.90748085, 20.91442541, 20.92131826,
              20.92806131],
             [20.61578999, 20.62179211, 20.62979557, 20.63704657, 20.64489553,
              20.65266656, 20.6603622 , 20.66798489, 20.67553689, 20.6830204 ,
              20.69043747, 20.69779008, 20.70508009, 20.7123093 , 20.7194794 ,
              20.72659202, 20.73364871, 20.74065097, 20.7476002 , 20.75449776,
              20.76124551],
             [20.42809155, 20.43619517, 20.44421237, 20.45214618, 20.45999945,
              20.46777485, 20.47547495, 20.48310215, 20.49065875, 20.49814692,
              20.50556872, 20.51292611, 20.52022098, 20.5274551 , 20.53463018,
              20.54174784, 20.54880962, 20.55581702, 20.56277146, 20.5696743 ,
              20.57642729]])

    • height
      (line, sample)
      float64
      9.791e-05 9.635e-05 ... 6.201e-05

      history :

      height: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/height

      definition :

      Height of the grid point above sea level [m].

      array([[9.79099423e-05, 9.63527709e-05, 9.48449597e-05, 9.33893025e-05,
              9.19774175e-05, 9.06093046e-05, 8.92868266e-05, 8.79978761e-05,
              8.67461786e-05, 8.55326653e-05, 8.43517482e-05, 8.32080841e-05,
              8.20877030e-05, 8.09999183e-05, 7.99428672e-05, 7.89090991e-05,
              7.79023394e-05, 7.69179314e-05, 7.59605318e-05, 7.50254840e-05,
              7.41230324e-05],
             [9.62130725e-05, 9.46866348e-05, 9.32132825e-05, 9.17809084e-05,
              9.03997570e-05, 8.90605152e-05, 8.77603889e-05, 8.64975154e-05,
              8.52700323e-05, 8.40825960e-05, 8.29240307e-05, 8.17989931e-05,
              8.07074830e-05, 7.96392560e-05, 7.86008313e-05, 7.75875524e-05,
              7.66003504e-05, 7.56392255e-05, 7.46967271e-05, 7.37812370e-05,
              7.28974119e-05],
             [9.45255160e-05, 9.30335373e-05, 9.15843993e-05, 9.01855528e-05,
              8.88286158e-05, 8.75163823e-05, 8.62414017e-05, 8.50064680e-05,
              8.38031992e-05, 8.26381147e-05, 8.15065578e-05, 8.04029405e-05,
              7.93291256e-05, 7.82841817e-05, 7.72662461e-05, 7.62725249e-05,
              7.53067434e-05, 7.43605196e-05, 7.34394416e-05, 7.25425780e-05,
              7.16755167e-05],
             [9.28519294e-05, 9.13869590e-05, 8.99676234e-05, 8.85976478e-05,
              8.72695819e-05, 8.59824941e-05, 8.47345218e-05, 8.35210085e-05,
      ...
              6.89364970e-05, 6.80861995e-05, 6.72573224e-05, 6.64480031e-05,
              6.56638294e-05],
             [4.94985069e+02, 4.94984913e+02, 1.34995908e+02, 2.92990927e+02,
              2.92990836e+02, 6.09980631e+02, 6.09980448e+02, 6.09980266e+02,
              6.09980087e+02, 7.41593540e-05, 7.31581822e-05, 7.21849501e-05,
              7.12377951e-05, 7.03139231e-05, 6.94189221e-05, 6.85416162e-05,
              6.76866621e-05, 6.68531284e-05, 6.60447404e-05, 6.52475283e-05,
              6.44829124e-05],
             [9.59971138e+02, 2.39992790e+02, 2.39992715e+02, 7.92862847e-05,
              7.81174749e-05, 7.69849867e-05, 7.58832321e-05, 7.48168677e-05,
              7.37821683e-05, 7.27754086e-05, 7.17965886e-05, 7.08447769e-05,
              6.99171796e-05, 6.90137967e-05, 6.81355596e-05, 6.72787428e-05,
              6.64424151e-05, 6.56284392e-05, 6.48312271e-05, 6.40535727e-05,
              6.33103773e-05],
             [8.12634826e-05, 8.00034031e-05, 7.87870958e-05, 7.76089728e-05,
              7.64662400e-05, 7.53616914e-05, 7.42897391e-05, 7.32494518e-05,
              7.22352415e-05, 7.12573528e-05, 7.02999532e-05, 6.93723559e-05,
              6.84671104e-05, 6.75851479e-05, 6.67264685e-05, 6.58901408e-05,
              6.50752336e-05, 6.42780215e-05, 6.35031611e-05, 6.27441332e-05,
              6.20130450e-05]])

    • azimuthTime
      (line, sample)
      datetime64[ns]
      2022-05-07T16:24:11.657260 ... 2...

      history :

      azimuthTime: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/azimuthTime

      definition :

      Zero Doppler azimuth time of terrain height measurement [UTC].

      array([['2022-05-07T16:24:11.657260000', '2022-05-07T16:24:11.657268000',
              '2022-05-07T16:24:11.657276000', '2022-05-07T16:24:11.657284000',
              '2022-05-07T16:24:11.657292000', '2022-05-07T16:24:11.657300000',
              '2022-05-07T16:24:11.657308000', '2022-05-07T16:24:11.657316000',
              '2022-05-07T16:24:11.657324000', '2022-05-07T16:24:11.657332000',
              '2022-05-07T16:24:11.657340000', '2022-05-07T16:24:11.657348000',
              '2022-05-07T16:24:11.657356000', '2022-05-07T16:24:11.657364000',
              '2022-05-07T16:24:11.657372000', '2022-05-07T16:24:11.657380000',
              '2022-05-07T16:24:11.657388000', '2022-05-07T16:24:11.657396000',
              '2022-05-07T16:24:11.657404000', '2022-05-07T16:24:11.657412000',
              '2022-05-07T16:24:11.657420000'],
             ['2022-05-07T16:24:14.413761000', '2022-05-07T16:24:14.413769000',
              '2022-05-07T16:24:14.413777000', '2022-05-07T16:24:14.413785000',
              '2022-05-07T16:24:14.413793000', '2022-05-07T16:24:14.413801000',
              '2022-05-07T16:24:14.413809000', '2022-05-07T16:24:14.413817000',
              '2022-05-07T16:24:14.413825000', '2022-05-07T16:24:14.413833000',
              '2022-05-07T16:24:14.413841000', '2022-05-07T16:24:14.413849000',
              '2022-05-07T16:24:14.413857000', '2022-05-07T16:24:14.413865000',
              '2022-05-07T16:24:14.413873000', '2022-05-07T16:24:14.413881000',
              '2022-05-07T16:24:14.413889000', '2022-05-07T16:24:14.413897000',
      ...
              '2022-05-07T16:24:36.490468000', '2022-05-07T16:24:36.490476000',
              '2022-05-07T16:24:36.490484000', '2022-05-07T16:24:36.490492000',
              '2022-05-07T16:24:36.490500000', '2022-05-07T16:24:36.490508000',
              '2022-05-07T16:24:36.490516000', '2022-05-07T16:24:36.490524000',
              '2022-05-07T16:24:36.490532000', '2022-05-07T16:24:36.490540000',
              '2022-05-07T16:24:36.490548000', '2022-05-07T16:24:36.490556000',
              '2022-05-07T16:24:36.490564000', '2022-05-07T16:24:36.490572000',
              '2022-05-07T16:24:36.490580000', '2022-05-07T16:24:36.490588000',
              '2022-05-07T16:24:36.490596000'],
             ['2022-05-07T16:24:39.551159000', '2022-05-07T16:24:39.551167000',
              '2022-05-07T16:24:39.551175000', '2022-05-07T16:24:39.551183000',
              '2022-05-07T16:24:39.551191000', '2022-05-07T16:24:39.551199000',
              '2022-05-07T16:24:39.551207000', '2022-05-07T16:24:39.551215000',
              '2022-05-07T16:24:39.551223000', '2022-05-07T16:24:39.551231000',
              '2022-05-07T16:24:39.551239000', '2022-05-07T16:24:39.551247000',
              '2022-05-07T16:24:39.551255000', '2022-05-07T16:24:39.551263000',
              '2022-05-07T16:24:39.551271000', '2022-05-07T16:24:39.551279000',
              '2022-05-07T16:24:39.551287000', '2022-05-07T16:24:39.551295000',
              '2022-05-07T16:24:39.551303000', '2022-05-07T16:24:39.551311000',
              '2022-05-07T16:24:39.551319000']], dtype='datetime64[ns]')

    • slantRangeTime
      (line, sample)
      float64
      0.005331 0.005347 ... 0.005651

      history :

      slantRangeTime: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/slantRangeTime

      definition :

      Two-way slant range time to first sample [s].

      array([[0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
      ...
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065],
             [0.00533105, 0.00534704, 0.00536303, 0.00537902, 0.00539502,
              0.00541101, 0.005427  , 0.00544299, 0.00545898, 0.00547497,
              0.00549097, 0.00550696, 0.00552295, 0.00553894, 0.00555493,
              0.00557093, 0.00558692, 0.00560291, 0.0056189 , 0.00563489,
              0.00565065]])

    • incidenceAngle
      (line, sample)
      float64
      30.8 31.13 31.45 ... 36.34 36.59

      history :

      incidenceAngle: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/incidenceAngle

      definition :

      Incidence angle to grid point [degrees].

      array([[30.80480156, 31.13231946, 31.45496711, 31.7729039 , 32.08628071,
              32.39524049, 32.69991884, 33.00044456, 33.29694014, 33.58952212,
              33.87830156, 34.16338438, 34.44487168, 34.72286005, 34.99744185,
              35.26870548, 35.5367356 , 35.80161337, 36.06341664, 36.32222012,
              36.57438635],
             [30.80697793, 31.13447027, 31.4570932 , 31.77500608, 32.08835974,
              32.39729707, 32.70195367, 33.00245828, 33.29893336, 33.59149543,
              33.88025552, 34.16531951, 34.44678849, 34.72475902, 34.99932344,
              35.27057014, 35.53858375, 35.80344542, 36.06523297, 36.32402111,
              36.57617255],
             [30.80911749, 31.13658474, 31.45918341, 31.77707282, 32.09040375,
              32.39931906, 32.7039543 , 33.0044382 , 33.30089316, 33.59343568,
              33.88217677, 34.16722229, 34.44867329, 34.72662631, 35.00117368,
              35.27240375, 35.54040116, 35.80524701, 36.06701913, 36.32579221,
              36.57792916],
             [30.81121843, 31.13866109, 31.46123598, 31.77910239, 32.09241104,
              32.40130476, 32.70591907, 33.00638265, 33.30281789, 33.59534126,
              33.88406372, 34.16909112, 34.45052449, 34.72846035, 35.002991  ,
              35.27420478, 35.54218629, 35.80701665, 36.06877364, 36.32753195,
              36.57965468],
      ...
             [30.81923444, 31.14658371, 31.4690683 , 31.78684733, 32.10007137,
              32.4088831 , 32.7134179 , 33.01380433, 33.31016466, 33.60261525,
              33.89126697, 34.17622556, 34.45759196, 34.73546261, 35.00992974,
              35.28108161, 35.54900277, 35.81377424, 36.07547377, 36.33417597,
              36.58624468],
             [30.89772194, 31.22409677, 31.49132301, 31.8324033 , 32.14509647,
              32.49954101, 32.80306029, 33.10246165, 33.39786583, 33.60434658,
              33.89298155, 34.17792385, 34.4592744 , 34.73712961, 35.01158171,
              35.28271892, 35.55062578, 35.81538331, 36.07706923, 36.33575815,
              36.58781407],
             [30.97136099, 31.18700344, 31.50899878, 31.79049617, 32.1036806 ,
              32.41245394, 32.71695152, 33.01730183, 33.31362709, 33.6060436 ,
              33.89466219, 34.17958856, 34.4609236 , 34.73876373, 35.01320111,
              35.28432399, 35.55221688, 35.81696077, 36.07863338, 36.3373093 ,
              36.58935272],
             [30.82503409, 31.15231628, 31.47473603, 31.7924523 , 32.10561557,
              32.41436842, 32.71884611, 33.01917713, 33.31548365, 33.60788196,
              33.89648285, 34.18139201, 34.4627103 , 34.74053411, 35.01495561,
              35.286063  , 35.55394078, 35.81866994, 36.08032817, 36.33899005,
              36.59101995]])

    • elevationAngle
      (line, sample)
      float64
      27.49 27.77 28.05 ... 32.28 32.5

      history :

      elevationAngle: annotation/s1a.xml: - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/line - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/pixel - /product/geolocationGrid/geolocationGridPointList/geolocationGridPoint/elevationAngle

      definition :

      Elevation angle to grid point [degrees].

      array([[27.48806268, 27.77374411, 28.054946  , 28.33181366, 28.60448463,
              28.87308926, 29.13775126, 29.39858813, 29.65571164, 29.90922819,
              30.15923917, 30.4058413 , 30.64912694, 30.88918433, 31.12609789,
              31.35994841, 31.59081331, 31.8187668 , 32.04388008, 32.26622153,
              32.48267427],
             [27.49004107, 27.77569967, 28.0568795 , 28.33372582, 28.60637613,
              28.87496074, 29.13960333, 29.40042138, 29.65752662, 29.91102543,
              30.16101916, 30.40760452, 30.65087384, 30.89091536, 31.12781345,
              31.3616489 , 31.59249911, 31.82043827, 32.04553758, 32.26786538,
              32.484305  ],
             [27.49198623, 27.77762243, 28.05878061, 28.33560599, 28.60823602,
              28.87680099, 29.14142454, 29.40222412, 29.65931143, 29.91279282,
              30.16276963, 30.40933854, 30.65259185, 30.89261777, 31.12950069,
              31.36332135, 31.59415715, 31.82208225, 32.04716784, 32.26948225,
              32.48590898],
             [27.49389653, 27.77951078, 28.06064774, 28.33745259, 28.61006275,
              28.87860847, 29.14321336, 29.40399484, 29.66106457, 29.91452889,
              30.16448911, 30.41104189, 30.65427951, 30.89429016, 31.13115819,
              31.36496437, 31.59578603, 31.82369735, 32.0487695 , 32.27107078,
              32.48748488],
      ...
             [27.50118766, 27.78671858, 28.067775  , 28.34450192, 28.61703664,
              28.88550928, 29.15004332, 29.41075606, 29.66775908, 29.9211586 ,
              30.17105584, 30.41754738, 30.66072541, 30.90067806, 31.13748962,
              31.37124075, 31.60200876, 31.82986776, 32.05488886, 32.27714031,
              32.49350646],
             [27.57206433, 27.85671861, 28.08788281, 28.38565109, 28.65770837,
              28.96739317, 29.23101378, 29.49084051, 29.74698358, 29.9227373 ,
              30.17261964, 30.41909669, 30.66226063, 30.90219956, 31.13899775,
              31.37273586, 31.60349118, 31.8313378 , 32.05634681, 32.27858648,
              32.49494127],
             [27.63856922, 27.82324011, 28.10385665, 28.34782468, 28.62032411,
              28.88876255, 29.15326344, 29.41394403, 29.67091583, 29.92428502,
              30.1741528 , 30.42061568, 30.66376583, 30.90369135, 31.14047647,
              31.37420185, 31.60494476, 31.83277927, 32.05777648, 32.28000462,
              32.49634832],
             [27.50646578, 27.79193689, 28.0729355 , 28.3496065 , 28.62208709,
              28.89050728, 29.15499046, 29.41565388, 29.67260901, 29.92596201,
              30.17581405, 30.42226163, 30.6653969 , 30.90530792, 31.14207893,
              31.37579056, 31.60652006, 31.8343415 , 32.05932594, 32.28154163,
              32.49787334]])

    • offboresightAngle
      (line, sample)
      float64
      26.72 27.0 27.28 ... 31.5 31.72

      comment :

      built from elevation angle and latitude

      array([[26.71657182, 27.00228733, 27.28352297, 27.56042404, 27.8331281 ,
              28.10176553, 28.36646002, 28.6273291 , 28.88448455, 29.13803276,
              29.38807515, 29.63470843, 29.87802498, 30.11811304, 30.35505704,
              30.58893778, 30.81983267, 31.04781594, 31.2729588 , 31.49532962,
              31.71181111],
             [26.71785359, 27.00354567, 27.28475865, 27.5616378 , 27.83432063,
              28.10293747, 28.36761199, 28.6284617 , 28.88559832, 29.13912824,
              29.38915284, 29.63576882, 29.87906852, 30.11914017, 30.35606819,
              30.58993334, 30.82081303, 31.04878147, 31.27390985, 31.49626653,
              31.71273441],
             [26.71911422, 27.00478331, 27.28597405, 27.56283167, 27.83549364,
              28.10409026, 28.36874518, 28.62957585, 28.88669399, 29.14020594,
              29.39021307, 29.63681206, 29.88009521, 30.12015076, 30.35706306,
              30.59091291, 30.82177767, 31.04973154, 31.2748457 , 31.49718849,
              31.71364299],
             [26.7203527 , 27.00599923, 27.28716815, 27.56400466, 27.83664617,
              28.10522297, 28.36985865, 28.63067065, 28.88777066, 29.14126499,
              29.39125498, 29.6378373 , 29.88110422, 30.12114396, 30.35804086,
              30.59187569, 30.8227258 , 31.05066538, 31.27576558, 31.49809474,
              31.71453613],
      ...
             [26.72508447, 27.01064521, 27.29173116, 27.56848734, 27.84105105,
              28.10955241, 28.37411492, 28.6348559 , 28.89188691, 29.14531419,
              29.39523898, 29.64175785, 29.884963  , 30.12494258, 30.36178085,
              30.59555852, 30.82635288, 31.05423804, 31.27928512, 31.5015624 ,
              31.71795382],
             [26.79535859, 27.080042  , 27.31123138, 27.60902988, 27.88111551,
              28.19083152, 28.45447993, 28.71433424, 28.97050466, 29.1462798 ,
              29.39618912, 29.64269294, 29.88588344, 30.12584874, 30.36267311,
              30.59643721, 30.82721834, 31.05509059, 31.28012507, 31.50239003,
              31.7187696 ],
             [26.86127308, 27.04596515, 27.32660996, 27.57060362, 27.84313082,
              28.1115968 , 28.37612498, 28.63683262, 28.89383126, 29.14722708,
              29.39712126, 29.64361035, 29.88678651, 30.12673784, 30.36354859,
              30.59729942, 30.8280676 , 31.05592721, 31.28094935, 31.50320226,
              31.71957021],
             [26.72851601, 27.014015  , 27.29504121, 27.57173957, 27.84424725,
              28.1126943 , 28.37720412, 28.63789394, 28.89487526, 29.14825424,
              29.39813205, 29.64460521, 29.88776586, 30.12770208, 30.36449811,
              30.59823458, 30.82898875, 31.05683469, 31.28184347, 31.50408334,
              31.72043874]])

  • Attributes: (4)

    footprint :

    POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

    coverage :

    190km * 86km (line * sample )

    approx_transform :

    |-0.00,-0.00,-156.02| |-0.00, 0.00, 22.12| | 0.00, 0.00, 1.00|

    history :

    annotations

  <xarray.DatasetView> Size: 239kB
  Dimensions:           (burst: 10, line: 1490)
  Dimensions without coordinates: burst, line
  Data variables:
      azimuthTime       (burst) datetime64[ns] 80B 2022-05-07T16:24:11.657511 ....
      azimuthAnxTime    (burst) float64 80B 2.603e+03 2.606e+03 ... 2.628e+03
      sensingTime       (burst) datetime64[ns] 80B 2022-05-07T16:24:12.795957 ....
      byteOffset        (burst) int64 80B 119515 122692875 ... 1103279755
      firstValidSample  (burst, line) float64 119kB nan nan nan ... nan nan nan
      lastValidSample   (burst, line) float64 119kB nan nan nan ... nan nan nan
      linesPerBurst     int64 8B 1490
      samplesPerBurst   int64 8B 20566
  Attributes:
      history:  annotations

  bursts

  • Groups: (0)
  • Dimensions:
    • burst: 10
    • line: 1490
  • Coordinates: (0)
  • Data variables: (8)
    • azimuthTime
      (burst)
      datetime64[ns]
      2022-05-07T16:24:11.657511 ... 2...

      source :

      //product/swathTiming/burstList/burst/azimuthTime

      definition :

      Zero Doppler azimuth time of terrain height measurement [UTC].

      array(['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:14.414012000',
             '2022-05-07T16:24:17.172568000', '2022-05-07T16:24:19.931125000',
             '2022-05-07T16:24:22.689681000', '2022-05-07T16:24:25.448238000',
             '2022-05-07T16:24:28.208850000', '2022-05-07T16:24:30.967406000',
             '2022-05-07T16:24:33.728019000', '2022-05-07T16:24:36.490686000'],
            dtype='datetime64[ns]')

    • azimuthAnxTime
      (burst)
      float64
      2.603e+03 2.606e+03 ... 2.628e+03

      source :

      //product/swathTiming/burstList/burst/azimuthAnxTime

      definition :

      Zero Doppler azimuth time of the first line of this burst relative to the Ascending Node Crossing (ANX) time. [s].

      array([2603.48686655, 2606.24336755, 2609.00192411, 2611.76048066,
             2614.51903722, 2617.27759377, 2620.03820588, 2622.79676244,
             2625.55737455, 2628.32004221])

    • sensingTime
      (burst)
      datetime64[ns]
      2022-05-07T16:24:12.795957 ... 2...

      source :

      //product/swathTiming/burstList/burst/sensingTime

      definition :

      Sensing time of the first input line of this burst [UTC].

      array(['2022-05-07T16:24:12.795957000', '2022-05-07T16:24:15.554234000',
             '2022-05-07T16:24:18.312511000', '2022-05-07T16:24:21.070788000',
             '2022-05-07T16:24:23.829065000', '2022-05-07T16:24:26.587342000',
             '2022-05-07T16:24:29.345619000', '2022-05-07T16:24:32.103896000',
             '2022-05-07T16:24:34.862173000', '2022-05-07T16:24:37.620450000'],
            dtype='datetime64[ns]')

    • byteOffset
      (burst)
      int64
      119515 122692875 ... 1103279755

      source :

      //product/swathTiming/burstList/burst/byteOffset

      definition :

      Byte offset of this burst within the image MDS.

      array([    119515,  122692875,  245266235,  367839595,  490412955,
              612986315,  735559675,  858133035,  980706395, 1103279755])

    • firstValidSample
      (burst, line)
      float64
      nan nan nan nan ... nan nan nan nan

      source :

      //product/swathTiming/burstList/burst/firstValidSample

      definition :

      An array of integers indicating the offset of the first valid image sample within each range line. This array contains count attribute integers, equal to the numberOfLines field (i.e. one value per range line within the burst), separated by spaces. If a range line does not contain any valid image samples, the integer is set to -1.

      array([[nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             ...,
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan]])

    • lastValidSample
      (burst, line)
      float64
      nan nan nan nan ... nan nan nan nan

      source :

      //product/swathTiming/burstList/burst/lastValidSample

      definition :

      An array of integers indicating the offset of the last valid image sample within each range line. This array contains count attribute integers, equal to the numberOfLines (i.e. one value per range line within the burst), separated by spaces. If a range line does not contain any valid image samples, the integer is set to -1.

      array([[nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             ...,
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan],
             [nan, nan, nan, ..., nan, nan, nan]])

    • linesPerBurst
      ()
      int64
      1490

      source :

      /product/swathTiming/linesPerBurst

      definition :

      Number of range lines within each burst (constant for all bursts within the swath).

      array(1490)

    • samplesPerBurst
      ()
      int64
      20566

      source :

      /product/swathTiming/samplesPerBurst

      definition :

      Number of range samples within each burst (constant for all bursts within the swath).

      array(20566)

  • Attributes: (1)

    history :

    annotations

  <xarray.DatasetView> Size: 264B
  Dimensions:                  (azimuthTime: 11)
  Coordinates:
    * azimuthTime              (azimuthTime) datetime64[ns] 88B 2022-05-07T16:2...
  Data variables:
      t0                       (azimuthTime) float64 88B 0.005331 ... 0.005331
      azimuthFmRatePolynomial  (azimuthTime) object 88B -2336.74129411 + 449131...
  Attributes:
      history:  annotations

  FMrate

  • Groups: (0)
  • Dimensions:
    • azimuthTime: 11
  • Coordinates: (1)
    • azimuthTime
      (azimuthTime)
      datetime64[ns]
      2022-05-07T16:24:10.466731 ... 2...

      array(['2022-05-07T16:24:10.466731000', '2022-05-07T16:24:13.225008000',
             '2022-05-07T16:24:15.983285000', '2022-05-07T16:24:18.741562000',
             '2022-05-07T16:24:21.499839000', '2022-05-07T16:24:24.258116000',
             '2022-05-07T16:24:27.016393000', '2022-05-07T16:24:29.774670000',
             '2022-05-07T16:24:32.532947000', '2022-05-07T16:24:35.291224000',
             '2022-05-07T16:24:38.049501000'], dtype='datetime64[ns]')

  • Data variables: (2)
    • t0
      (azimuthTime)
      float64
      0.005331 0.005331 ... 0.005331

      source :

      //product/generalAnnotation/azimuthFmRateList/azimuthFmRate/t0

      definition :

      Two-way slant range time origin for Doppler centroid estimate [s].

      array([0.00533105, 0.00533105, 0.00533105, 0.00533105, 0.00533105,
             0.00533105, 0.00533105, 0.00533105, 0.00533105, 0.00533105,
             0.00533105])

    • azimuthFmRatePolynomial
      (azimuthTime)
      object
      -2336.74129411 + 449131.68742689...

      source :

      //product/generalAnnotation/azimuthFmRateList/azimuthFmRate/azimuthFmRatePolynomial

      definition :

      Azimuth FM rate coefficients array in order of c0 [Hz/s] c1 [Hz/s^2] [Hz/s^3].

      array([Polynomial([-2.33674129e+03,  4.49131687e+05, -7.84171810e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33680873e+03,  4.49105238e+05, -7.84030716e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33687585e+03,  4.49077532e+05, -7.83854349e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33694280e+03,  4.49051018e+05, -7.83737344e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33700959e+03,  4.49024480e+05, -7.83607435e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33707610e+03,  4.48997772e+05, -7.83482687e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33714252e+03,  4.48970979e+05, -7.83336431e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33721251e+03,  4.48944656e+05, -7.83211684e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33730905e+03,  4.48921093e+05, -7.83070590e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33737565e+03,  4.48894192e+05, -7.82945842e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.33740567e+03,  4.48862849e+05, -7.82807330e+07], domain=[-1,  1], window=[-1,  1], symbol='x')],
            dtype=object)

  • Attributes: (1)

    history :

    annotations

  <xarray.DatasetView> Size: 4kB
  Dimensions:                       (azimuthTime: 11, nb_fine_dce: 20)
  Coordinates:
    * azimuthTime                   (azimuthTime) datetime64[ns] 88B 2022-05-07...
    * nb_fine_dce                   (nb_fine_dce) int64 160B 0 1 2 3 ... 17 18 19
  Data variables:
      t0                            (azimuthTime) float64 88B 0.005332 ... 0.00...
      geometryDcPolynomial          (azimuthTime) object 88B -1.940496 + 203.43...
      dataDcPolynomial              (azimuthTime) object 88B -29.09492 - 13406....
      fineDceAzimuthStartTime       (azimuthTime) datetime64[ns] 88B 2022-05-07...
      fineDceAzimuthStopTime        (azimuthTime) datetime64[ns] 88B 2022-05-07...
      dataDcRmsError                (azimuthTime) float64 88B 1.826 ... 10.56
      slantRangeTime                (azimuthTime, nb_fine_dce) float64 2kB 0.00...
      frequency                     (azimuthTime, nb_fine_dce) float64 2kB -27....
      dataDcRmsErrorAboveThreshold  (azimuthTime) bool 11B False False ... False
  Attributes:
      history:  annotations

  doppler_estimate

  • Groups: (0)
  • Dimensions:
    • azimuthTime: 11
    • nb_fine_dce: 20
  • Coordinates: (2)
    • azimuthTime
      (azimuthTime)
      datetime64[ns]
      2022-05-07T16:24:11.429471 ... 2...

      array(['2022-05-07T16:24:11.429471000', '2022-05-07T16:24:14.187748000',
             '2022-05-07T16:24:16.946025000', '2022-05-07T16:24:19.704302000',
             '2022-05-07T16:24:22.462579000', '2022-05-07T16:24:25.220855000',
             '2022-05-07T16:24:27.979132000', '2022-05-07T16:24:30.737409000',
             '2022-05-07T16:24:33.495686000', '2022-05-07T16:24:36.253963000',
             '2022-05-07T16:24:39.012240000'], dtype='datetime64[ns]')

    • nb_fine_dce
      (nb_fine_dce)
      int64
      0 1 2 3 4 5 6 ... 14 15 16 17 18 19

      array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
             18, 19])

  • Data variables: (9)
    • t0
      (azimuthTime)
      float64
      0.005332 0.005332 ... 0.005332

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/t0

      definition :

      Two-way slant range time origin for Doppler centroid estimate [s].

      array([0.00533224, 0.00533224, 0.00533224, 0.00533224, 0.00533224,
             0.00533171, 0.00533171, 0.00533171, 0.00533171, 0.00533171,
             0.00533171])

    • geometryDcPolynomial
      (azimuthTime)
      object
      -1.940496 + 203.4306·x - 20637.4...

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/geometryDcPolynomial

      definition :

      Doppler centroid estimated from orbit, expressed as the following polynomial (assuming 5 coefficients): Doppler Centroid = d0 + d1(tSR-t0) + d2(tSR-t0)^2 + d3(tSR-t0)^3 + d4(tSR-t0)^4, where tSR = 2 way slant range time.

      array([Polynomial([-1.940496e+00,  2.034306e+02, -2.063740e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([   -1.76325,   116.1467 , -1343.451  ], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.245580e+00, -9.459727e+01,  4.381152e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.613851e+00, -2.677762e+02,  9.355653e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.380152e+00, -3.947137e+02,  1.379209e+05], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.872657e+00, -1.684786e+02,  8.847030e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-3.242540e+00, -1.613305e+02,  9.254735e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.444676e+00,  1.025335e+02,  1.296379e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.961256e+00,  2.179256e+02, -2.398971e+04], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-9.981540e-01,  7.051301e+02, -1.627624e+05], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-6.454930e-01,  4.591829e+02, -1.060734e+05], domain=[-1,  1], window=[-1,  1], symbol='x')],
            dtype=object)

    • dataDcPolynomial
      (azimuthTime)
      object
      -29.09492 - 13406.99·x + 1733544...

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/dataDcPolynomial

      definition :

      Doppler centroid estimated from data, expressed as the following polynomial (assuming 5 coefficients): Doppler Centroid = d0 + d1(tSR-t0) + d2(tSR-t0)^2 + d3(tSR-t0)^3 + d4(tSR-t0)^4, where tSR = 2 way slant range time.

      array([Polynomial([-2.909492e+01, -1.340699e+04,  1.733544e+06], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.845972e+01, -2.513027e+04,  1.019592e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.832118e+01, -3.225884e+04,  1.945238e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-2.926211e+01, -1.944826e+04,  1.407431e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-3.355178e+01,  3.151459e+03, -9.152305e+06], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-4.717522e+01,  9.623474e+04, -9.403345e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-3.155702e+01, -2.276110e+04,  3.550629e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.533712e+01, -9.614476e+04,  1.061441e+08], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.271675e+01, -9.190727e+04,  8.905502e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-1.517143e+01, -4.988486e+04,  2.890735e+07], domain=[-1,  1], window=[-1,  1], symbol='x'),
             Polynomial([-7.389060e+00, -1.593441e+04, -2.924028e+07], domain=[-1,  1], window=[-1,  1], symbol='x')],
            dtype=object)

    • fineDceAzimuthStartTime
      (azimuthTime)
      datetime64[ns]
      2022-05-07T16:24:10.040818 ... 2...

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/fineDceAzimuthStartTime

      definition :

      First zero Doppler azimuth time of the block of signal data used for the fine DC estimates [UTC].

      array(['2022-05-07T16:24:10.040818000', '2022-05-07T16:24:12.799095000',
             '2022-05-07T16:24:15.557372000', '2022-05-07T16:24:18.315649000',
             '2022-05-07T16:24:21.073926000', '2022-05-07T16:24:23.832202000',
             '2022-05-07T16:24:26.590479000', '2022-05-07T16:24:29.348756000',
             '2022-05-07T16:24:32.107033000', '2022-05-07T16:24:34.865310000',
             '2022-05-07T16:24:37.623587000'], dtype='datetime64[ns]')

    • fineDceAzimuthStopTime
      (azimuthTime)
      datetime64[ns]
      2022-05-07T16:24:12.818125 ... 2...

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/fineDceAzimuthStopTime

      definition :

      Last zero Doppler azimuth time of the block of signal data used for the fine DC estimates [UTC].

      array(['2022-05-07T16:24:12.818125000', '2022-05-07T16:24:15.576402000',
             '2022-05-07T16:24:18.334679000', '2022-05-07T16:24:21.092956000',
             '2022-05-07T16:24:23.851233000', '2022-05-07T16:24:26.609509000',
             '2022-05-07T16:24:29.367786000', '2022-05-07T16:24:32.126063000',
             '2022-05-07T16:24:34.884340000', '2022-05-07T16:24:37.642617000',
             '2022-05-07T16:24:40.400894000'], dtype='datetime64[ns]')

    • dataDcRmsError
      (azimuthTime)
      float64
      1.826 2.185 2.643 ... 14.93 10.56

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/dataDcRmsError

      definition :

      The RMS error of the Doppler centroid estimate. It is calculated as the average of the individual RMS residual errors between input fine Doppler centroid estimates and the fitted polynomial. If the Doppler centroid was not estimated from data, this is set to 0.

      array([ 1.82553303,  2.18548489,  2.64297891,  3.50035191,  2.87786102,
             16.17304039,  8.07669353, 12.16345978,  9.02491856, 14.92638016,
             10.55780983])

    • slantRangeTime
      (azimuthTime, nb_fine_dce)
      float64
      0.005338 0.005357 ... 0.005697

      source :

      ///product/dopplerCentroid/dcEstimateList/dcEstimate/fineDceList/fineDce/slantRangeTime

      definition :

      Two-way slant range time to first sample [s].

      array([[0.00533846, 0.00535733, 0.00537621, 0.00539509, 0.00541396,
              0.00543284, 0.00545172, 0.00547061, 0.00548947, 0.00550836,
              0.00552724, 0.00554612, 0.00556499, 0.00558387, 0.00560275,
              0.00562164, 0.0056405 , 0.00565939, 0.00567827, 0.00569715],
             [0.00533846, 0.00535733, 0.00537621, 0.00539509, 0.00541396,
              0.00543284, 0.00545172, 0.00547061, 0.00548947, 0.00550836,
              0.00552724, 0.00554612, 0.00556499, 0.00558387, 0.00560275,
              0.00562164, 0.0056405 , 0.00565939, 0.00567827, 0.00569715],
             [0.00533846, 0.00535733, 0.00537621, 0.00539509, 0.00541396,
              0.00543284, 0.00545172, 0.00547061, 0.00548947, 0.00550836,
              0.00552724, 0.00554612, 0.00556499, 0.00558387, 0.00560275,
              0.00562164, 0.0056405 , 0.00565939, 0.00567827, 0.00569715],
             [0.00533846, 0.00535733, 0.00537621, 0.00539509, 0.00541396,
              0.00543284, 0.00545172, 0.00547061, 0.00548947, 0.00550836,
              0.00552724, 0.00554612, 0.00556499, 0.00558387, 0.00560275,
              0.00562164, 0.0056405 , 0.00565939, 0.00567827, 0.00569715],
             [0.00533846, 0.00535733, 0.00537621, 0.00539509, 0.00541396,
              0.00543284, 0.00545172, 0.00547061, 0.00548947, 0.00550836,
              0.00552724, 0.00554612, 0.00556499, 0.00558387, 0.00560275,
              0.00562164, 0.0056405 , 0.00565939, 0.00567827, 0.00569715],
      ...
             [0.00533793, 0.00535679, 0.00537568, 0.00539456, 0.00541343,
              0.00543231, 0.00545119, 0.00547007, 0.00548894, 0.00550782,
              0.00552671, 0.00554559, 0.00556446, 0.00558334, 0.00560222,
              0.0056211 , 0.00563997, 0.00565885, 0.00567774, 0.00569662],
             [0.00533793, 0.00535679, 0.00537568, 0.00539456, 0.00541343,
              0.00543231, 0.00545119, 0.00547007, 0.00548894, 0.00550782,
              0.00552671, 0.00554559, 0.00556446, 0.00558334, 0.00560222,
              0.0056211 , 0.00563997, 0.00565885, 0.00567774, 0.00569662],
             [0.00533793, 0.00535679, 0.00537568, 0.00539456, 0.00541343,
              0.00543231, 0.00545119, 0.00547007, 0.00548894, 0.00550782,
              0.00552671, 0.00554559, 0.00556446, 0.00558334, 0.00560222,
              0.0056211 , 0.00563997, 0.00565885, 0.00567774, 0.00569662],
             [0.00533793, 0.00535679, 0.00537568, 0.00539456, 0.00541343,
              0.00543231, 0.00545119, 0.00547007, 0.00548894, 0.00550782,
              0.00552671, 0.00554559, 0.00556446, 0.00558334, 0.00560222,
              0.0056211 , 0.00563997, 0.00565885, 0.00567774, 0.00569662],
             [0.00533793, 0.00535679, 0.00537568, 0.00539456, 0.00541343,
              0.00543231, 0.00545119, 0.00547007, 0.00548894, 0.00550782,
              0.00552671, 0.00554559, 0.00556446, 0.00558334, 0.00560222,
              0.0056211 , 0.00563997, 0.00565885, 0.00567774, 0.00569662]])

    • frequency
      (azimuthTime, nb_fine_dce)
      float64
      -27.52 -27.51 ... -32.82 -31.01

      source :

      ///product/dopplerCentroid/dcEstimateList/dcEstimate/fineDceList/fineDce/frequency

      definition :

      Fine Doppler centroid frequency estimate [Hz].

      array([[-27.52157021, -27.50889969, -28.82595062, -27.9175396 ,
              -29.90924072, -29.47175026, -30.91732025, -29.99861908,
              -32.4839592 , -33.34737015, -32.62556839, -33.34249878,
              -33.69543076, -34.45344162, -37.68162918, -37.34695053,
              -39.80113983, -38.36444855, -40.00785065, -39.58068848],
             [-27.41634941, -27.0886097 , -30.74727058, -27.99299049,
              -28.40113068, -31.00344086, -31.30912971, -31.4368    ,
              -29.08625031, -30.20290947, -31.45470047, -34.48556137,
              -34.96620941, -37.32873917, -39.03546143, -41.96979904,
              -39.70980835, -39.36436081, -41.40106964, -41.32448959],
             [-25.52825928, -27.80928993, -27.37649918, -26.71101952,
              -27.51111984, -28.46850967, -30.80577087, -32.61574173,
              -33.48387909, -35.29327011, -36.39995956, -36.34585953,
              -35.6739006 , -39.62757874, -40.27819061, -40.46260071,
              -39.17781067, -39.79776001, -43.09185028, -43.72381973],
             [-24.38767052, -24.88612938, -26.14509964, -27.32094002,
              -29.92189026, -32.13824081, -32.33971024, -32.21144104,
              -35.44192886, -35.95011902, -34.84724045, -34.6737709 ,
              -36.56008148, -34.41197968, -35.98717117, -35.28474045,
              -36.66020966, -38.95888901, -38.1019783 , -40.87960052],
      ...
             [-21.17457962, -23.36281967, -29.57826042, -27.56805038,
              -28.44621086, -33.5929718 , -15.82065964, -16.53697968,
              -22.25052071, -27.46192932, -31.52887917, -27.23527908,
              -22.40708923, -19.75466919, -17.81225967, -18.62467957,
              -23.11050987, -28.76170921, -40.94623947, -50.00674057],
             [-13.43078995, -23.49938011, -29.72591019, -21.83105087,
              -26.14620018,  -7.76925278, -10.67224979, -24.06813049,
              -26.66267967, -30.21647072, -59.49094009, -54.22357941,
              -32.64326096, -15.80130005, -33.08156967, -39.88785934,
              -38.59914017, -40.57992172, -36.12203979, -39.91994095],
             [  8.12143993,   6.82265615,  -4.00163698, -15.32785034,
               -7.96885395, -44.80712128, -36.47188187, -39.05257034,
              -35.39511871, -20.73279953,   6.26764584,   1.81357503,
              -14.33310032, -20.82695007, -30.40840912, -34.53123856,
              -43.14717865, -48.63111877, -51.98598862, -59.40716934],
             [-23.62294006, -19.66319084, -21.91098022, -12.87131023,
              -11.50934029,  -2.89534807,   6.20456791,  15.02425957,
                6.60662317,  -0.3460874 ,  -8.40280056,  -7.24514008,
               -5.90980816,  -7.70203686, -22.4235096 , -31.14838028,
               -9.97441006, -12.97727966, -32.81925964, -31.01205063]])

    • dataDcRmsErrorAboveThreshold
      (azimuthTime)
      bool
      False False False ... False False

      source :

      //product/dopplerCentroid/dcEstimateList/dcEstimate/dataDcRmsErrorAboveThreshold

      definition :

      False if the RMS error is below the acceptable threshold for the Doppler centroid estimated from the data. True if the RMS error is greater than or equal to the acceptable threshold.

      array([False, False, False, False, False, False, False, False, False,
             False, False])

  • Attributes: (1)

    history :

    annotations

  <xarray.DatasetView> Size: 952B
  Dimensions:     (time: 17)
  Coordinates:
    * time        (time) datetime64[ns] 136B 2022-05-07T16:23:08.178010 ... 202...
  Data variables:
      velocity_x  (time) float64 136B -3.562e+03 -3.499e+03 ... -2.499e+03
      velocity_y  (time) float64 136B -53.72 -14.41 24.81 ... 486.6 524.1 561.6
      velocity_z  (time) float64 136B -6.71e+03 -6.743e+03 ... -7.153e+03
      position_x  (time) float64 136B -5.632e+06 -5.668e+06 ... -6.119e+06
      position_y  (time) float64 136B -3.046e+06 -3.046e+06 ... -3.005e+06
      position_z  (time) float64 136B 3.003e+06 2.936e+06 ... 1.963e+06 1.892e+06
  Attributes:
      orbit_pass:        Descending
      platform_heading:  -167.7204378813183
      frame:             Earth Fixed
      history:           orbit:\n  annotation/s1a.xml:\n  - //product/generalAn...

  orbit

  • Groups: (0)
  • Dimensions:
    • time: 17
  • Coordinates: (1)
    • time
      (time)
      datetime64[ns]
      2022-05-07T16:23:08.178010 ... 2...

      array(['2022-05-07T16:23:08.178010000', '2022-05-07T16:23:18.178010000',
             '2022-05-07T16:23:28.178011000', '2022-05-07T16:23:38.178011000',
             '2022-05-07T16:23:48.178010000', '2022-05-07T16:23:58.178010000',
             '2022-05-07T16:24:08.178011000', '2022-05-07T16:24:18.178011000',
             '2022-05-07T16:24:28.178010000', '2022-05-07T16:24:38.178010000',
             '2022-05-07T16:24:48.178011000', '2022-05-07T16:24:58.178011000',
             '2022-05-07T16:25:08.178010000', '2022-05-07T16:25:18.178010000',
             '2022-05-07T16:25:28.178011000', '2022-05-07T16:25:38.178011000',
             '2022-05-07T16:25:48.178010000'], dtype='datetime64[ns]')

  • Data variables: (6)
    • velocity_x
      (time)
      float64
      -3.562e+03 ... -2.499e+03

      array([-3561.997039, -3498.682699, -3434.918197, -3370.710871,
             -3306.068122, -3240.99741 , -3175.50625 , -3109.602216,
             -3043.292939, -2976.586102, -2909.489444, -2842.010758,
             -2774.157889, -2705.938729, -2637.361223, -2568.433363,
             -2499.163187])

    • velocity_y
      (time)
      float64
      -53.72 -14.41 24.81 ... 524.1 561.6

      array([-53.723911, -14.41211 ,  24.808935,  63.93414 , 102.958443,
             141.876802, 180.684197, 219.375631, 257.946129, 296.390741,
             334.704542, 372.882634, 410.920142, 448.812223, 486.55406 ,
             524.140866, 561.567885])

    • velocity_z
      (time)
      float64
      -6.71e+03 -6.743e+03 ... -7.153e+03

      array([-6709.666233, -6743.218634, -6776.009484, -6808.03503 ,
             -6839.291612, -6869.775656, -6899.483677, -6928.412282,
             -6956.558167, -6983.918118, -7010.489015, -7036.267829,
             -7061.251623, -7085.437555, -7108.822876, -7131.404929,
             -7153.181151])

    • position_x
      (time)
      float64
      -5.632e+06 ... -6.119e+06

      array([-5632416.692446, -5667720.469377, -5702388.845989, -5736417.357301,
             -5769801.612041, -5802537.293235, -5834620.158778, -5866046.04202 ,
             -5896810.852327, -5926910.575642, -5956341.275023, -5985099.091185,
             -6013180.243015, -6040581.028093, -6067297.82318 , -6093327.084722,
             -6118665.349356])

    • position_y
      (time)
      float64
      -3.046e+06 ... -3.005e+06

      array([-3046010.669301, -3046351.275834, -3046299.213888, -3045855.416462,
             -3045020.867284, -3043796.600608, -3042183.700991, -3040183.303079,
             -3037796.591377, -3035024.800018, -3031869.212508, -3028331.161467,
             -3024412.028368, -3020113.24328 , -3015436.284584, -3010382.678681,
             -3004953.999717])

    • position_z
      (time)
      float64
      3.003e+06 2.936e+06 ... 1.892e+06

      array([3003399.822704, 2936134.765305, 2868537.988486, 2800617.126603,
             2732379.851069, 2663833.869473, 2594986.924692, 2525846.793995,
             2456421.288138, 2386718.250465, 2316745.555988, 2246511.110459,
             2176022.849458, 2105288.737474, 2034316.766978, 1963114.957472,
             1891691.354522])

  • Attributes: (4)

    orbit_pass :

    Descending

    platform_heading :

    -167.7204378813183

    frame :

    Earth Fixed

    history :

    orbit: annotation/s1a.xml: - //product/generalAnnotation/orbitList/orbit/time - //product/generalAnnotation/orbitList/orbit/frame - //product/generalAnnotation/orbitList/orbit/position/x - //product/generalAnnotation/orbitList/orbit/position/y - //product/generalAnnotation/orbitList/orbit/position/z - //product/generalAnnotation/orbitList/orbit/velocity/x - //product/generalAnnotation/orbitList/orbit/velocity/y - //product/generalAnnotation/orbitList/orbit/velocity/z - /product/generalAnnotation/productInformation/pass - /product/generalAnnotation/productInformation/platformHeading

  <xarray.DatasetView> Size: 3kB
  Dimensions:                  (dim_0: 2)
  Dimensions without coordinates: dim_0
  Data variables: (12/14)
      LineUtcTime              (dim_0) datetime64[ns] 16B 2022-05-07T16:24:11.6...
      numberOfLines            int64 8B 14900
      numberOfSamples          int64 8B 20566
      azimuthPixelSpacing      float64 8B 14.0
      slantRangePixelSpacing   float64 8B 2.33
      groundRangePixelSpacing  float64 8B 4.178
      ...                       ...
      slantRangeTime           float64 8B 0.005331
      swath_subswath           <U3 12B 'IW1'
      radarFrequency           float64 8B 5.405e+09
      rangeSamplingRate        float64 8B 6.435e+07
      azimuthSteeringRate      float64 8B 1.59
      history                  <U824 3kB 'image:\n  annotation/s1a.xml:\n  - /p...

  image

  • Groups: (0)
  • Dimensions:
    • dim_0: 2
  • Coordinates: (0)
  • Data variables: (14)
    • LineUtcTime
      (dim_0)
      datetime64[ns]
      2022-05-07T16:24:11.657511 2022-...

      source :

      /product/imageAnnotation/imageInformation/*[contains(name(),"LineUtcTime")]

      array(['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:39.551410000'],
            dtype='datetime64[ns]')

    • numberOfLines
      ()
      int64
      14900

      source :

      /product/imageAnnotation/imageInformation/numberOfLines

      definition :

      Total number of lines in the output image (image length).

      array(14900)

    • numberOfSamples
      ()
      int64
      20566

      source :

      /product/imageAnnotation/imageInformation/numberOfSamples

      definition :

      Total number of samples in the output image (image width).

      array(20566)

    • azimuthPixelSpacing
      ()
      float64
      14.0

      source :

      /product/imageAnnotation/imageInformation/azimuthPixelSpacing

      definition :

      Nominal pixel spacing between range lines [m].

      array(14.00234)

    • slantRangePixelSpacing
      ()
      float64
      2.33

      source :

      /product/imageAnnotation/imageInformation/rangePixelSpacing

      array(2.329562)

    • groundRangePixelSpacing
      ()
      float64
      4.178

      source :

      /product/imageAnnotation/imageInformation/rangePixelSpacing

      array(4.17838022)

    • incidenceAngleMidSwath
      ()
      float64
      33.88

      source :

      /product/imageAnnotation/imageInformation/incidenceAngleMidSwath

      definition :

      Incidence angle at mid swath [degrees].

      array(33.88498178)

    • azimuthTimeInterval
      ()
      float64
      0.002056

      source :

      /product/imageAnnotation/imageInformation/azimuthTimeInterval

      definition :

      Time spacing between azimuth lines of the output image [s].

      array(0.00205556)

    • slantRangeTime
      ()
      float64
      0.005331

      source :

      /product/imageAnnotation/imageInformation/slantRangeTime

      definition :

      Two-way slant range time to first sample [s].

      array(0.00533105)

    • swath_subswath
      ()
      <U3
      'IW1'

      source :

      /product/adsHeader/swath

      array('IW1', dtype='<U3')

    • radarFrequency
      ()
      float64
      5.405e+09

      source :

      /product/generalAnnotation/productInformation/radarFrequency

      definition :

      Radar frequency [Hz]. The value of this field is identical for all slices.

      array(5.40500045e+09)

    • rangeSamplingRate
      ()
      float64
      6.435e+07

      source :

      /product/generalAnnotation/productInformation/rangeSamplingRate

      definition :

      Range sample rate [Hz]. The value of this field is identical for all slices.

      array(64345238.12571428)

    • azimuthSteeringRate
      ()
      float64
      1.59

      source :

      /product/generalAnnotation/productInformation/azimuthSteeringRate

      definition :

      Azimuth steering rate for IW and EW modes [degrees/s].

      array(1.59036878)

    • history
      ()
      <U824
      'image:\n annotation/s1a.xml:\n...

      array('image:\n  annotation/s1a.xml:\n  - /product/adsHeader/productType\n  - /product/imageAnnotation/imageInformation/*[contains(name(),"LineUtcTime")]\n  - /product/imageAnnotation/imageInformation/numberOfLines\n  - /product/imageAnnotation/imageInformation/numberOfSamples\n  - /product/imageAnnotation/imageInformation/incidenceAngleMidSwath\n  - /product/imageAnnotation/imageInformation/azimuthTimeInterval\n  - /product/imageAnnotation/imageInformation/slantRangeTime\n  - /product/imageAnnotation/imageInformation/azimuthPixelSpacing\n  - /product/imageAnnotation/imageInformation/rangePixelSpacing\n  - /product/adsHeader/swath\n  - /product/generalAnnotation/productInformation/radarFrequency\n  - /product/generalAnnotation/productInformation/rangeSamplingRate\n  - /product/generalAnnotation/productInformation/azimuthSteeringRate\n',
            dtype='<U824')

  • Attributes: (0)

  <xarray.DatasetView> Size: 500kB
  Dimensions:      (pol: 2, line: 30, sample: 516)
  Coordinates:
    * line         (line) int64 240B 0 486 973 1608 ... 13978 14464 15099 15585
    * sample       (sample) int64 4kB 0 40 80 120 160 ... 20480 20520 20560 20565
    * pol          (pol) object 16B 'VV' 'VH'
  Data variables:
      sigma0_lut   (pol, line, sample) float64 248kB 331.1 331.0 ... 306.9 306.9
      gamma0_lut   (pol, line, sample) float64 248kB 306.8 306.7 ... 274.9 274.9
      azimuthTime  (pol, line) datetime64[ns] 480B 2022-05-07T16:24:11.657511 ....
  Attributes:
      history:  calibration

  calibration

  • Groups: (0)
  • Dimensions:
    • pol: 2
    • line: 30
    • sample: 516
  • Coordinates: (3)
    • line
      (line)
      int64
      0 486 973 ... 14464 15099 15585

      array([    0,   486,   973,  1608,  2095,  2581,  3216,  3702,  4189,  4823,
              5310,  5796,  6431,  6917,  7552,  8038,  8525,  9158,  9645, 10131,
             10766, 11252, 11739, 12372, 12859, 13491, 13978, 14464, 15099, 15585])

    • sample
      (sample)
      int64
      0 40 80 120 ... 20520 20560 20565

      array([    0,    40,    80, ..., 20520, 20560, 20565])

    • pol
      (pol)
      object
      'VV' 'VH'

      array(['VV', 'VH'], dtype=object)

  • Data variables: (3)
    • sigma0_lut
      (pol, line, sample)
      float64
      331.1 331.0 330.9 ... 306.9 306.9

      description :

      look up table sigma0

      history :

      sigma0_lut: annotation/calibration/calibration.xml: //calibration/calibrationVectorList/calibrationVector/sigmaNought

      array([[[331.0559, 330.9939, 330.9319, ..., 306.9752, 306.9395,
               306.9351],
              [331.0523, 330.9903, 330.9283, ..., 306.973 , 306.9373,
               306.9329],
              [331.0488, 330.9868, 330.9248, ..., 306.9709, 306.9352,
               306.9308],
              ...,
              [330.9679, 330.9059, 330.8441, ..., 306.9218, 306.8861,
               306.8817],
              [330.965 , 330.903 , 330.8412, ..., 306.92  , 306.8844,
               306.8799],
              [330.9621, 330.9001, 330.8383, ..., 306.9182, 306.8826,
               306.8781]],
      
             [[331.0559, 330.9939, 330.9319, ..., 306.9752, 306.9395,
               306.9351],
              [331.0523, 330.9903, 330.9283, ..., 306.973 , 306.9373,
               306.9329],
              [331.0488, 330.9868, 330.9248, ..., 306.9709, 306.9352,
               306.9308],
              ...,
              [330.9679, 330.9059, 330.8441, ..., 306.9218, 306.8861,
               306.8817],
              [330.965 , 330.903 , 330.8412, ..., 306.92  , 306.8844,
               306.8799],
              [330.9621, 330.9001, 330.8383, ..., 306.9182, 306.8826,
               306.8781]]])

    • gamma0_lut
      (pol, line, sample)
      float64
      306.8 306.7 306.6 ... 274.9 274.9

      description :

      look up table gamma0

      history :

      gamma0_lut: annotation/calibration/calibration.xml: //calibration/calibrationVectorList/calibrationVector/gamma

      array([[[306.7742, 306.6963, 306.6183, ..., 275.071 , 275.0214,
               275.0152],
              [306.7697, 306.6917, 306.6138, ..., 275.0679, 275.0184,
               275.0122],
              [306.7652, 306.6873, 306.6093, ..., 275.065 , 275.0154,
               275.0092],
              ...,
              [306.6635, 306.5856, 306.5078, ..., 274.9967, 274.9471,
               274.9409],
              [306.6599, 306.582 , 306.5042, ..., 274.9943, 274.9447,
               274.9385],
              [306.6563, 306.5784, 306.5006, ..., 274.9918, 274.9423,
               274.9361]],
      
             [[306.7742, 306.6963, 306.6183, ..., 275.071 , 275.0214,
               275.0152],
              [306.7697, 306.6917, 306.6138, ..., 275.0679, 275.0184,
               275.0122],
              [306.7652, 306.6873, 306.6093, ..., 275.065 , 275.0154,
               275.0092],
              ...,
              [306.6635, 306.5856, 306.5078, ..., 274.9967, 274.9471,
               274.9409],
              [306.6599, 306.582 , 306.5042, ..., 274.9943, 274.9447,
               274.9385],
              [306.6563, 306.5784, 306.5006, ..., 274.9918, 274.9423,
               274.9361]]])

    • azimuthTime
      (pol, line)
      datetime64[ns]
      2022-05-07T16:24:11.657511 ... 2...

      description :

      azimuth times associated to the signal look up table

      history :

      azimuthTime: annotation/calibration/calibration.xml: /calibration/calibrationVectorList/calibrationVector/azimuthTime

      array([['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:12.657511000',
              '2022-05-07T16:24:13.657511000', '2022-05-07T16:24:14.657511000',
              '2022-05-07T16:24:15.657511000', '2022-05-07T16:24:16.657511000',
              '2022-05-07T16:24:17.657511000', '2022-05-07T16:24:18.657511000',
              '2022-05-07T16:24:19.657511000', '2022-05-07T16:24:20.657511000',
              '2022-05-07T16:24:21.657511000', '2022-05-07T16:24:22.657511000',
              '2022-05-07T16:24:23.657511000', '2022-05-07T16:24:24.657511000',
              '2022-05-07T16:24:25.657511000', '2022-05-07T16:24:26.657511000',
              '2022-05-07T16:24:27.657511000', '2022-05-07T16:24:28.657511000',
              '2022-05-07T16:24:29.657511000', '2022-05-07T16:24:30.657511000',
              '2022-05-07T16:24:31.657511000', '2022-05-07T16:24:32.657511000',
              '2022-05-07T16:24:33.657511000', '2022-05-07T16:24:34.657511000',
              '2022-05-07T16:24:35.657511000', '2022-05-07T16:24:36.657511000',
              '2022-05-07T16:24:37.657511000', '2022-05-07T16:24:38.657511000',
              '2022-05-07T16:24:39.657511000', '2022-05-07T16:24:40.657511000'],
             ['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:12.657511000',
              '2022-05-07T16:24:13.657511000', '2022-05-07T16:24:14.657511000',
              '2022-05-07T16:24:15.657511000', '2022-05-07T16:24:16.657511000',
              '2022-05-07T16:24:17.657511000', '2022-05-07T16:24:18.657511000',
              '2022-05-07T16:24:19.657511000', '2022-05-07T16:24:20.657511000',
              '2022-05-07T16:24:21.657511000', '2022-05-07T16:24:22.657511000',
              '2022-05-07T16:24:23.657511000', '2022-05-07T16:24:24.657511000',
              '2022-05-07T16:24:25.657511000', '2022-05-07T16:24:26.657511000',
              '2022-05-07T16:24:27.657511000', '2022-05-07T16:24:28.657511000',
              '2022-05-07T16:24:29.657511000', '2022-05-07T16:24:30.657511000',
              '2022-05-07T16:24:31.657511000', '2022-05-07T16:24:32.657511000',
              '2022-05-07T16:24:33.657511000', '2022-05-07T16:24:34.657511000',
              '2022-05-07T16:24:35.657511000', '2022-05-07T16:24:36.657511000',
              '2022-05-07T16:24:37.657511000', '2022-05-07T16:24:38.657511000',
              '2022-05-07T16:24:39.657511000', '2022-05-07T16:24:40.657511000']],
            dtype='datetime64[ns]')

  • Attributes: (1)

    history :

    calibration

  <xarray.DatasetView> Size: 95kB
  Dimensions:      (pol: 2, line: 11, sample: 516)
  Coordinates:
    * sample       (sample) int64 4kB 0 40 80 120 160 ... 20480 20520 20560 20565
    * pol          (pol) object 16B 'VV' 'VH'
    * line         (line) int64 88B 0 1490 2980 4470 ... 10430 11920 13410 15048
  Data variables:
      noise_lut    (pol, line, sample) float64 91kB 461.8 459.1 ... 404.7 404.9
      azimuthTime  (pol, line) datetime64[ns] 176B 2022-05-07T16:24:11.657511 ....
  Attributes:
      history:                    noise_lut_range_raw:\n  annotation/calibratio...
      corrected_range_noise_lut:  shift : 1490 lines

  noise_range

  • Groups: (0)
  • Dimensions:
    • pol: 2
    • line: 11
    • sample: 516
  • Coordinates: (3)
    • sample
      (sample)
      int64
      0 40 80 120 ... 20520 20560 20565

      array([    0,    40,    80, ..., 20520, 20560, 20565])

    • pol
      (pol)
      object
      'VV' 'VH'

      array(['VV', 'VH'], dtype=object)

    • line
      (line)
      int64
      0 1490 2980 ... 11920 13410 15048

      array([    0,  1490,  2980,  4470,  5960,  7450,  8940, 10430, 11920, 13410,
             15048])

  • Data variables: (2)
    • noise_lut
      (pol, line, sample)
      float64
      461.8 459.1 456.4 ... 404.7 404.9

      description :

      /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut

      array([[[461.7704, 459.0763, 456.4116, ..., 359.5638, 361.385 ,
               361.6137],
              [461.4418, 458.7511, 456.0898, ..., 359.7324, 361.555 ,
               361.7838],
              [460.9003, 458.214 , 455.5571, ..., 359.66  , 361.4827,
               361.7116],
              ...,
              [486.6978, 484.0195, 481.4019, ..., 389.2076, 391.1934,
               391.4427],
              [485.1259, 482.3081, 479.5587, ..., 381.2087, 383.1438,
               383.3868],
              [481.7057, 478.908 , 476.1784, ..., 378.5271, 380.4486,
               380.6899]],
      
             [[508.892 , 505.82  , 502.7814, ..., 387.5552, 389.5025,
               389.7469],
              [507.5195, 504.4573, 501.4288, ..., 386.9737, 388.9184,
               389.1626],
              [508.4113, 505.3453, 502.3127, ..., 388.0371, 389.9876,
               390.2325],
              ...,
              [527.6726, 524.6068, 521.5937, ..., 412.8702, 414.9582,
               415.2203],
              [526.6307, 523.4653, 520.3589, ..., 404.7949, 406.8326,
               407.0885],
              [523.8549, 520.7066, 517.6169, ..., 402.6679, 404.6949,
               404.9494]]])

    • azimuthTime
      (pol, line)
      datetime64[ns]
      2022-05-07T16:24:11.657511 ... 2...

      description :

      /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut

      array([['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:14.414012000',
              '2022-05-07T16:24:17.172568000', '2022-05-07T16:24:19.931125000',
              '2022-05-07T16:24:22.689681000', '2022-05-07T16:24:25.448238000',
              '2022-05-07T16:24:28.208850000', '2022-05-07T16:24:30.967406000',
              '2022-05-07T16:24:33.728019000', '2022-05-07T16:24:36.490686000',
              '2022-05-07T16:24:39.551409000'],
             ['2022-05-07T16:24:11.657511000', '2022-05-07T16:24:14.414012000',
              '2022-05-07T16:24:17.172568000', '2022-05-07T16:24:19.931125000',
              '2022-05-07T16:24:22.689681000', '2022-05-07T16:24:25.448238000',
              '2022-05-07T16:24:28.208850000', '2022-05-07T16:24:30.967406000',
              '2022-05-07T16:24:33.728019000', '2022-05-07T16:24:36.490686000',
              '2022-05-07T16:24:39.551409000']], dtype='datetime64[ns]')

  • Attributes: (2)

    history :

    noise_lut_range_raw: annotation/calibration/noise.xml: - /noise/noiseRangeVectorList/noiseRangeVector/line | /noise/noiseVectorList/noiseVector/line - /noise/noiseRangeVectorList/noiseRangeVector/pixel | /noise/noiseVectorList/noiseVector/pixel - /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut - /noise/noiseRangeVectorList/noiseRangeVector/azimuthTime noise_lut_range_raw: annotation/calibration/noise.xml: - /noise/noiseRangeVectorList/noiseRangeVector/line | /noise/noiseVectorList/noiseVector/line - /noise/noiseRangeVectorList/noiseRangeVector/pixel | /noise/noiseVectorList/noiseVector/pixel - /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut - /noise/noiseRangeVectorList/noiseRangeVector/azimuthTime noise_lut_range_raw: annotation/calibration/noise.xml: - /noise/noiseRangeVectorList/noiseRangeVector/line | /noise/noiseVectorList/noiseVector/line - /noise/noiseRangeVectorList/noiseRangeVector/pixel | /noise/noiseVectorList/noiseVector/pixel - /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut - /noise/noiseRangeVectorList/noiseRangeVector/azimuthTime noise_lut_range_raw: annotation/calibration/noise.xml: - /noise/noiseRangeVectorList/noiseRangeVector/line | /noise/noiseVectorList/noiseVector/line - /noise/noiseRangeVectorList/noiseRangeVector/pixel | /noise/noiseVectorList/noiseVector/pixel - /noise/noiseRangeVectorList/noiseRangeVector/noiseRangeLut | /noise/noiseVectorList/noiseVector/noiseLut - /noise/noiseRangeVectorList/noiseRangeVector/azimuthTime

    corrected_range_noise_lut :

    shift : 1490 lines

  <xarray.DatasetView> Size: 36kB
  Dimensions:       (pol: 2, line: 1500)
  Coordinates:
    * line          (line) int64 12kB 0 10 20 30 40 ... 14870 14880 14890 14899
    * pol           (pol) object 16B 'VV' 'VH'
  Data variables:
      noise_lut     (pol, line) float64 24kB 1.17 1.165 1.161 ... 1.143 1.146
      line_start    (pol) int64 16B 0 0
      line_stop     (pol) int64 16B 14899 14899
      sample_start  (pol) int64 16B 0 0
      sample_stop   (pol) int64 16B 20565 20565
  Attributes:
      history:  noise_lut_azi_raw_slc:\n  annotation/calibration/noise.xml:\n  ...

  noise_azimuth

  • Groups: (0)
  • Dimensions:
    • pol: 2
    • line: 1500
  • Coordinates: (2)
    • line
      (line)
      int64
      0 10 20 30 ... 14880 14890 14899

      array([    0,    10,    20, ..., 14880, 14890, 14899])

    • pol
      (pol)
      object
      'VV' 'VH'

      array(['VV', 'VH'], dtype=object)

  • Data variables: (5)
    • noise_lut
      (pol, line)
      float64
      1.17 1.165 1.161 ... 1.143 1.146

      description :

      /noise/noiseAzimuthVectorList/noiseAzimuthVector/noiseAzimuthLut

      array([[1.17023 , 1.165381, 1.160553, ..., 1.153659, 1.158345, 1.162106],
             [1.170132, 1.165393, 1.160673, ..., 1.13842 , 1.142726, 1.146183]])

    • line_start
      (pol)
      int64
      0 0

      swath :

      ['IW1']

      description :

      /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstAzimuthLine

      array([0, 0])

    • line_stop
      (pol)
      int64
      14899 14899

      swath :

      ['IW1']

      description :

      /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastAzimuthLine

      array([14899, 14899])

    • sample_start
      (pol)
      int64
      0 0

      swath :

      ['IW1']

      description :

      /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstRangeSample

      array([0, 0])

    • sample_stop
      (pol)
      int64
      20565 20565

      swath :

      ['IW1']

      description :

      /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastRangeSample

      array([20565, 20565])

  • Attributes: (1)

    history :

    noise_lut_azi_raw_slc: annotation/calibration/noise.xml: - /noise/noiseAzimuthVectorList/noiseAzimuthVector/line - /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstAzimuthLine - /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastAzimuthLine - /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstRangeSample - /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastRangeSample - /noise/noiseAzimuthVectorList/noiseAzimuthVector/noiseAzimuthLut - /noise/noiseAzimuthVectorList/noiseAzimuthVector/swath noise_lut_azi_raw_slc: annotation/calibration/noise.xml: - /noise/noiseAzimuthVectorList/noiseAzimuthVector/line - /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstAzimuthLine - /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastAzimuthLine - /noise/noiseAzimuthVectorList/noiseAzimuthVector/firstRangeSample - /noise/noiseAzimuthVectorList/noiseAzimuthVector/lastRangeSample - /noise/noiseAzimuthVectorList/noiseAzimuthVector/noiseAzimuthLut - /noise/noiseAzimuthVectorList/noiseAzimuthVector/swath

  <xarray.DatasetView> Size: 176kB
  Dimensions:         (swath_nb: 1, dim_slantRangeTime: 645, dim_azimuthTime: 11)
  Coordinates:
    * swath_nb        (swath_nb) int64 8B 1
  Dimensions without coordinates: dim_slantRangeTime, dim_azimuthTime
  Data variables:
      slantRangeTime  (swath_nb, dim_slantRangeTime) float64 5kB 0.005331 ... 0...
      swath           (swath_nb, dim_azimuthTime) float64 88B 1.0 1.0 ... 1.0 1.0
      roll            (swath_nb, dim_azimuthTime) float64 88B 30.22 ... 30.23
      azimuthTime     (swath_nb, dim_azimuthTime) datetime64[ns] 88B 2022-05-07...
      terrainHeight   (swath_nb, dim_azimuthTime) float64 88B 0.0 0.0 ... 0.0
      elevationAngle  (swath_nb, dim_azimuthTime, dim_slantRangeTime) float64 57kB ...
      incidenceAngle  (swath_nb, dim_azimuthTime, dim_slantRangeTime) float64 57kB ...
      gain            (swath_nb, dim_azimuthTime, dim_slantRangeTime) float64 57kB ...
  Attributes:
      dim_azimuthTime:     max dimension of azimuthTime for a swath
      dim_slantRangeTime:  max dimension of slantRangeTime for a swath
      comment:             The antenna pattern data set record contains a list ...
      example:             for example, if swath Y is smaller than swath X, use...
      source:              Sentinel-1 Product Specification
      history:             antenna_pattern:\n  annotation/s1a.xml:\n  - /produc...

  antenna_pattern

  • Groups: (0)
  • Dimensions:
    • swath_nb: 1
    • dim_slantRangeTime: 645
    • dim_azimuthTime: 11
  • Coordinates: (1)
    • swath_nb
      (swath_nb)
      int64
      1

      array([1])

  • Data variables: (8)
    • slantRangeTime
      (swath_nb, dim_slantRangeTime)
      float64
      0.005331 0.005331 ... 0.005651

      array([[0.00533094, 0.00533144, 0.00533193, 0.00533243, 0.00533293,
              0.00533343, 0.00533392, 0.00533442, 0.00533492, 0.00533541,
              0.00533591, 0.00533641, 0.00533691, 0.0053374 , 0.0053379 ,
              0.0053384 , 0.0053389 , 0.00533939, 0.00533989, 0.00534039,
              0.00534089, 0.00534138, 0.00534188, 0.00534238, 0.00534287,
              0.00534337, 0.00534387, 0.00534437, 0.00534486, 0.00534536,
              0.00534586, 0.00534636, 0.00534685, 0.00534735, 0.00534785,
              0.00534834, 0.00534884, 0.00534934, 0.00534984, 0.00535033,
              0.00535083, 0.00535133, 0.00535183, 0.00535232, 0.00535282,
              0.00535332, 0.00535382, 0.00535431, 0.00535481, 0.00535531,
              0.0053558 , 0.0053563 , 0.0053568 , 0.0053573 , 0.00535779,
              0.00535829, 0.00535879, 0.00535929, 0.00535978, 0.00536028,
              0.00536078, 0.00536128, 0.00536177, 0.00536227, 0.00536277,
              0.00536326, 0.00536376, 0.00536426, 0.00536476, 0.00536525,
              0.00536575, 0.00536625, 0.00536675, 0.00536724, 0.00536774,
              0.00536824, 0.00536873, 0.00536923, 0.00536973, 0.00537023,
              0.00537072, 0.00537122, 0.00537172, 0.00537222, 0.00537271,
              0.00537321, 0.00537371, 0.00537421, 0.0053747 , 0.0053752 ,
              0.0053757 , 0.00537619, 0.00537669, 0.00537719, 0.00537769,
              0.00537818, 0.00537868, 0.00537918, 0.00537968, 0.00538017,
      ...
              0.00560198, 0.00560247, 0.00560297, 0.00560347, 0.00560397,
              0.00560446, 0.00560496, 0.00560546, 0.00560596, 0.00560645,
              0.00560695, 0.00560745, 0.00560794, 0.00560844, 0.00560894,
              0.00560944, 0.00560993, 0.00561043, 0.00561093, 0.00561143,
              0.00561192, 0.00561242, 0.00561292, 0.00561342, 0.00561391,
              0.00561441, 0.00561491, 0.0056154 , 0.0056159 , 0.0056164 ,
              0.0056169 , 0.00561739, 0.00561789, 0.00561839, 0.00561889,
              0.00561938, 0.00561988, 0.00562038, 0.00562087, 0.00562137,
              0.00562187, 0.00562237, 0.00562286, 0.00562336, 0.00562386,
              0.00562436, 0.00562485, 0.00562535, 0.00562585, 0.00562635,
              0.00562684, 0.00562734, 0.00562784, 0.00562833, 0.00562883,
              0.00562933, 0.00562983, 0.00563032, 0.00563082, 0.00563132,
              0.00563182, 0.00563231, 0.00563281, 0.00563331, 0.00563381,
              0.0056343 , 0.0056348 , 0.0056353 , 0.00563579, 0.00563629,
              0.00563679, 0.00563729, 0.00563778, 0.00563828, 0.00563878,
              0.00563928, 0.00563977, 0.00564027, 0.00564077, 0.00564126,
              0.00564176, 0.00564226, 0.00564276, 0.00564325, 0.00564375,
              0.00564425, 0.00564475, 0.00564524, 0.00564574, 0.00564624,
              0.00564674, 0.00564723, 0.00564773, 0.00564823, 0.00564872,
              0.00564922, 0.00564972, 0.00565022, 0.00565071, 0.00565121]])

    • swath
      (swath_nb, dim_azimuthTime)
      float64
      1.0 1.0 1.0 1.0 ... 1.0 1.0 1.0 1.0

      array([[1., 1., 1., 1., 1., 1., 1., 1., 1., 1., 1.]])

    • roll
      (swath_nb, dim_azimuthTime)
      float64
      30.22 30.22 30.22 ... 30.23 30.23

      array([[30.21829682, 30.21902781, 30.21991452, 30.22104889, 30.22210479,
              30.22327456, 30.22381973, 30.2241912 , 30.22465318, 30.22535031,
              30.22557534]])

    • azimuthTime
      (swath_nb, dim_azimuthTime)
      datetime64[ns]
      2022-05-07T16:24:11.657510912 .....

      array([['2022-05-07T16:24:11.657510912', '2022-05-07T16:24:14.414011904',
              '2022-05-07T16:24:17.172568064', '2022-05-07T16:24:19.931124992',
              '2022-05-07T16:24:22.689680896', '2022-05-07T16:24:25.448238080',
              '2022-05-07T16:24:28.208849920', '2022-05-07T16:24:30.967406080',
              '2022-05-07T16:24:33.728018944', '2022-05-07T16:24:36.490685952',
              '2022-05-07T16:24:39.551408896']], dtype='datetime64[ns]')

    • terrainHeight
      (swath_nb, dim_azimuthTime)
      float64
      0.0 0.0 0.0 0.0 ... 133.5 2.023 0.0

      array([[  0.        ,   0.        ,   0.        ,   0.        ,
                0.        ,   0.        ,   8.62405909,  55.76468727,
              133.499045  ,   2.02337455,   0.        ]])

    • elevationAngle
      (swath_nb, dim_azimuthTime, dim_slantRangeTime)
      float64
      27.49 27.5 27.5 ... 32.5 32.51

      array([[[27.48693, 27.49588, 27.50483, ..., 32.47741, 32.4842 ,
               32.49099],
              [27.48889, 27.49784, 27.50679, ..., 32.47903, 32.48582,
               32.49261],
              [27.49082, 27.49977, 27.50872, ..., 32.48062, 32.48741,
               32.4942 ],
              ...,
              [27.52033, 27.52927, 27.53821, ..., 32.50473, 32.51151,
               32.51829],
              [27.50363, 27.51258, 27.52152, ..., 32.49121, 32.49799,
               32.50478],
              [27.50389, 27.51284, 27.52178, ..., 32.49142, 32.49821,
               32.505  ]]])

    • incidenceAngle
      (swath_nb, dim_azimuthTime, dim_slantRangeTime)
      float64
      30.83 30.84 30.85 ... 36.62 36.62

      array([[[30.82901, 30.83928, 30.84953, ..., 36.59306, 36.60097,
               36.60889],
              [30.83104, 30.84129, 30.85155, ..., 36.5947 , 36.60262,
               36.61052],
              [30.83301, 30.84326, 30.85352, ..., 36.59631, 36.60422,
               36.61214],
              ...,
              [30.86472, 30.87497, 30.88521, ..., 36.62206, 36.62996,
               36.63786],
              [30.84605, 30.85631, 30.86656, ..., 36.60693, 36.61484,
               36.62274],
              [30.8463 , 30.85654, 30.86679, ..., 36.60712, 36.61502,
               36.62294]]])

    • gain
      (swath_nb, dim_azimuthTime, dim_slantRangeTime)
      float64
      1.849e+14 1.859e+14 ... 2.961e+14

      array([[[1.84948735e+14, 1.85887205e+14, 1.86826756e+14, ...,
               2.99406723e+14, 2.98302882e+14, 2.97200254e+14],
              [1.85078080e+14, 1.86016567e+14, 1.86956342e+14, ...,
               2.99261979e+14, 2.98158343e+14, 2.97056023e+14],
              [1.85187426e+14, 1.86126105e+14, 1.87065930e+14, ...,
               2.99147322e+14, 2.98043668e+14, 2.96941532e+14],
              ...,
              [1.87788767e+14, 1.88704723e+14, 1.89597701e+14, ...,
               2.96002362e+14, 2.94902278e+14, 2.93803538e+14],
              [1.85960778e+14, 1.86900244e+14, 1.87840903e+14, ...,
               2.98310528e+14, 2.97208087e+14, 2.96106971e+14],
              [1.85964252e+14, 1.86903865e+14, 1.87844529e+14, ...,
               2.98311569e+14, 2.97209126e+14, 2.96107909e+14]]])

  • Attributes: (6)

    dim_azimuthTime :

    max dimension of azimuthTime for a swath

    dim_slantRangeTime :

    max dimension of slantRangeTime for a swath

    comment :

    The antenna pattern data set record contains a list of vectors of the antenna elevation pattern values that have been updated along track and used to correct the radiometry during image processing.

    example :

    for example, if swath Y is smaller than swath X, user has to remove nan to get the dims of the swath

    source :

    Sentinel-1 Product Specification

    history :

    antenna_pattern: annotation/s1a.xml: - /product/antennaPattern/antennaPatternList/antennaPattern/swath - /product/antennaPattern/antennaPatternList/antennaPattern/roll - /product/antennaPattern/antennaPatternList/antennaPattern/azimuthTime - /product/antennaPattern/antennaPatternList/antennaPattern/terrainHeight - /product/antennaPattern/antennaPatternList/antennaPattern/elevationAngle - /product/antennaPattern/antennaPatternList/antennaPattern/elevationPattern - /product/antennaPattern/antennaPatternList/antennaPattern/incidenceAngle - /product/antennaPattern/antennaPatternList/antennaPattern/slantRangeTime

  <xarray.DatasetView> Size: 0B
  Dimensions:  ()
  Data variables:
      *empty*

  swath_merging

  • Groups: (0)
  • Dimensions:
  • Coordinates: (0)
  • Data variables: (0)
  • Attributes: (0)

  <xarray.DatasetView> Size: 0B
  Dimensions:  ()
  Data variables:
      *empty*

  recalibration

  • Groups: (0)
  • Dimensions:
  • Coordinates: (0)
  • Data variables: (0)
  • Attributes: (0)

• Dimensions:
• Coordinates: (0)
• Inherited coordinates: (0)
• Data variables: (0)
• Attributes: (15)

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.51

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-05-07 16:24:11.657511

  stop_date :

  2022-05-07 16:24:39.551410

  footprint :

  POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

  coverage :

  190km * 86km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -167.7204378813183

compute a first time the cross spectra without impulse response

import xsarslc.processing.xspectra
intra_xs_without_IR = xsarslc.processing.xspectra.compute_IW_subswath_intraburst_xspectra(dt,
                                         tile_width={'sample': 5.e3, 'line': 5.e3},
                                         tile_overlap={'sample': -10.e3, 'line': -10.e3},
                                         periodo_width = {'sample': 4000, 'line': 4000},
                                        periodo_overlap = {'sample': 2000, 'line': 2000},
                                        polarization='VV',dev=True)
intra_xs_without_IR

intrabursts: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:05<00:00,  5.67s/it]

<xarray.Dataset> Size: 44MB
Dimensions:                   (tile_sample: 6, tile_line: 2, bt_thresh: 5,
                               0tau: 3, freq_line: 57, freq_sample: 446,
                               1tau: 2, 2tau: 1, c_sample: 2, c_line: 2,
                               k_gp: 4, phi_hf: 5, lambda_range_max_macs: 11)
Coordinates:
    pol                       <U2 8B 'VV'
  * bt_thresh                 (bt_thresh) int64 40B 5 50 100 150 200
    k_rg                      (tile_line, tile_sample, freq_sample) float64 43kB ...
    k_az                      (freq_line) float64 456B -0.04409 ... 0.04409
    line                      (tile_line) int64 16B 209 1280
    sample                    (tile_line, tile_sample) int64 96B 1274 ... 19158
    longitude                 (tile_line, tile_sample) float64 96B -156.1 ......
    latitude                  (tile_line, tile_sample) float64 96B 22.1 ... 2...
  * k_gp                      (k_gp) int64 32B 1 2 3 4
  * phi_hf                    (phi_hf) int64 40B 1 2 3 4 5
  * lambda_range_max_macs     (lambda_range_max_macs) float64 88B 25.0 ... 275.0
Dimensions without coordinates: tile_sample, tile_line, 0tau, freq_line,
                                freq_sample, 1tau, 2tau, c_sample, c_line
Data variables: (12/30)
    incidence                 (tile_line, tile_sample) float64 96B 31.21 ... ...
    ground_heading            (tile_line, tile_sample) float64 96B -168.9 ......
    sensing_time              (tile_line, tile_sample) datetime64[ns] 96B 202...
    tile_width_sample         (tile_line, tile_sample) int64 96B 5003 ... 5002
    tile_width_line           (tile_line, tile_sample) int64 96B 4998 ... 4998
    sigma0                    (tile_line, tile_sample) float64 96B 0.1109 ......
    ...                        ...
    burst_corner_longitude    (tile_line, c_sample, c_line) float64 64B -156....
    burst_corner_latitude     (tile_line, c_sample, c_line) float64 64B 22.11...
    cwave_params              (tile_line, tile_sample, k_gp, phi_hf) float64 2kB ...
    macs                      (tile_line, tile_sample, lambda_range_max_macs) complex128 2kB ...
    azimuth_cutoff            (tile_line, tile_sample) float64 96B 265.5 ... ...
    azimuth_cutoff_error      (tile_line, tile_sample) float64 96B 0.06312 .....
Attributes: (12/24)
    name:                          SENTINEL1_DS:/home/datawork-cersat-public/...
    short_name:                    SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162...
    product:                       SLC
    safe:                          S1A_IW_SLC__1SDV_20220507T162411_20220507T...
    swath:                         IW
    multidataset:                  False
    ...                            ...
    radar_frequency:               5405000454.33435
    azimuth_time_interval:         0.002055556299999998
    required_tile_width_sample:    5000.0
    required_tile_width_line:      5000.0
    required_tile_overlap_sample:  -10000.0
    required_tile_overlap_line:    -10000.0

xarray.Dataset

• Dimensions:
  • tile_sample: 6
  • tile_line: 2
  • bt_thresh: 5
  • 0tau: 3
  • freq_line: 57
  • freq_sample: 446
  • 1tau: 2
  • 2tau: 1
  • c_sample: 2
  • c_line: 2
  • k_gp: 4
  • phi_hf: 5
  • lambda_range_max_macs: 11
• Coordinates: (11)
  • pol
    ()
    <U2
    'VV'

    array('VV', dtype='<U2')

  • bt_thresh
    (bt_thresh)
    int64
    5 50 100 150 200

    long_name :

    lower edge of bright target to background amplitude ratio

    array([  5,  50, 100, 150, 200])

  • k_rg
    (tile_line, tile_sample, freq_sample)
    float64
    0.0 0.00157 ... 0.6972 0.6988

    long_name :

    wavenumber in range direction

    units :

    rad/m

    array([[[0.        , 0.00157028, 0.00314056, ..., 0.69563443,
             0.69720471, 0.698775  ],
            [0.        , 0.00157122, 0.00314245, ..., 0.69605158,
             0.69762281, 0.69919403],
            [0.        , 0.00157078, 0.00314155, ..., 0.69585426,
             0.69742504, 0.69899582],
            [0.        , 0.00157076, 0.00314151, ..., 0.69584461,
             0.69741537, 0.69898612],
            [0.        , 0.00157109, 0.00314219, ..., 0.69599453,
             0.69756563, 0.69913672],
            [0.        , 0.00157029, 0.00314057, ..., 0.69563637,
             0.69720666, 0.69877694]],
    
           [[0.        , 0.00157036, 0.00314072, ..., 0.69566877,
             0.69723912, 0.69880948],
            [0.        , 0.00157129, 0.00314259, ..., 0.69608337,
             0.69765466, 0.69922596],
            [0.        , 0.00157084, 0.00314169, ..., 0.69588375,
             0.6974546 , 0.69902544],
            [0.        , 0.00157082, 0.00314163, ..., 0.69587205,
             0.69744287, 0.69901369],
            [0.        , 0.00157115, 0.0031423 , ..., 0.69602013,
             0.69759129, 0.69916244],
            [0.        , 0.00157034, 0.00314068, ..., 0.69566029,
             0.69723063, 0.69880097]]])

  • k_az
    (freq_line)
    float64
    -0.04409 -0.04251 ... 0.04409

    long_name :

    wavenumber in azimuth direction

    units :

    rad/m

    spacing :

    0.0015744699982801337

    array([-0.04408516, -0.04251069, -0.04093622, -0.03936175, -0.03778728,
           -0.03621281, -0.03463834, -0.03306387, -0.0314894 , -0.02991493,
           -0.02834046, -0.02676599, -0.02519152, -0.02361705, -0.02204258,
           -0.02046811, -0.01889364, -0.01731917, -0.0157447 , -0.01417023,
           -0.01259576, -0.01102129, -0.00944682, -0.00787235, -0.00629788,
           -0.00472341, -0.00314894, -0.00157447,  0.        ,  0.00157447,
            0.00314894,  0.00472341,  0.00629788,  0.00787235,  0.00944682,
            0.01102129,  0.01259576,  0.01417023,  0.0157447 ,  0.01731917,
            0.01889364,  0.02046811,  0.02204258,  0.02361705,  0.02519152,
            0.02676599,  0.02834046,  0.02991493,  0.0314894 ,  0.03306387,
            0.03463834,  0.03621281,  0.03778728,  0.03936175,  0.04093622,
            0.04251069,  0.04408516])

  • line
    (tile_line)
    int64
    209 1280

    array([ 209, 1280])

  • sample
    (tile_line, tile_sample)
    int64
    1274 4661 8146 ... 15397 19158

    array([[ 1274,  4661,  8146, 11725, 15397, 19158],
           [ 1274,  4661,  8146, 11725, 15397, 19158]])

  • longitude
    (tile_line, tile_sample)
    float64
    -156.1 -156.2 ... -156.7 -156.8

    array([[-156.06775206, -156.21035178, -156.35304699, -156.49569908,
            -156.63848843, -156.78126404],
           [-156.09580433, -156.23826244, -156.3808161 , -156.52332678,
            -156.66597464, -156.8086088 ]])

  • latitude
    (tile_line, tile_sample)
    float64
    22.1 22.12 22.15 ... 22.07 22.09

    array([[22.09707782, 22.12297099, 22.14874894, 22.17438323, 22.19990997,
            22.22529794],
           [21.96411638, 21.99001875, 22.01580682, 22.04145214, 22.06699082,
            22.09239162]])

  • k_gp
    (k_gp)
    int64
    1 2 3 4

    long_name :

    Gegenbauer polynoms dimension

    array([1, 2, 3, 4])

  • phi_hf
    (phi_hf)
    int64
    1 2 3 4 5

    long_name :

    Harmonic functions dimension (odd number)

    array([1, 2, 3, 4, 5])

  • lambda_range_max_macs
    (lambda_range_max_macs)
    float64
    25.0 50.0 75.0 ... 250.0 275.0

    long_name :

    maximum wavelength bound for MACS estimation

    array([ 25.,  50.,  75., 100., 125., 150., 175., 200., 225., 250., 275.])

• Data variables: (30)
  • incidence
    (tile_line, tile_sample)
    float64
    31.21 32.25 33.27 ... 35.26 36.22

    long_name :

    incidence at tile middle

    units :

    degree

    array([[31.20873866, 32.24999523, 33.27137238, 34.27440195, 35.25793403,
            36.223318  ],
           [31.21045183, 32.2516462 , 33.27296578, 34.27594172, 35.25942386,
            36.22476108]])

  • ground_heading
    (tile_line, tile_sample)
    float64
    -168.9 -169.0 ... -169.1 -169.2

    long_name :

    ground heading

    units :

    degree

    convention :

    from North clockwise

    array([[-168.92803327, -168.98376967, -169.03937287, -169.09489514,
            -169.15032438, -169.2057274 ],
           [-168.91790251, -168.97367489, -169.02931426, -169.08487291,
            -169.14033873, -169.19577858]])

  • sensing_time
    (tile_line, tile_sample)
    datetime64[ns]
    2022-05-07T16:24:12.895957 ... 2...

    long_name :

    tile sensing time

    array([['2022-05-07T16:24:12.895957000', '2022-05-07T16:24:12.894957000',
            '2022-05-07T16:24:12.894957000', '2022-05-07T16:24:12.893957000',
            '2022-05-07T16:24:12.892957000', '2022-05-07T16:24:12.891957000'],
           ['2022-05-07T16:24:13.411957000', '2022-05-07T16:24:13.406957000',
            '2022-05-07T16:24:13.402957000', '2022-05-07T16:24:13.397957000',
            '2022-05-07T16:24:13.392957000', '2022-05-07T16:24:13.387957000']],
          dtype='datetime64[ns]')

  • tile_width_sample
    (tile_line, tile_sample)
    int64
    5003 5007 5002 ... 5000 5003 5002

    long_name :

    tile width in sample direction

    units :

    m

    array([[5003, 5007, 5002, 5001, 5004, 5002],
           [5003, 5007, 5001, 5000, 5003, 5002]])

  • tile_width_line
    (tile_line, tile_sample)
    int64
    4998 4998 4998 ... 4998 4998 4998

    long_name :

    tile width in line direction

    units :

    m

    array([[4998, 4998, 4998, 4998, 4998, 4998],
           [4998, 4998, 4998, 4998, 4998, 4998]])

  • sigma0
    (tile_line, tile_sample)
    float64
    0.1109 0.1162 ... 0.08615 0.08434

    long_name :

    RAW calibrated sigma0

    units :

    linear

    array([[0.11088875, 0.11622112, 0.09905173, 0.09610074, 0.08611807,
            0.0778491 ],
           [0.12396615, 0.12034758, 0.10801527, 0.09761236, 0.08614841,
            0.08433734]])

  • nesz
    (tile_line, tile_sample)
    float64
    0.003997 0.003449 ... 0.003558

    long_name :

    RAW noise-equivalent sigma zero

    units :

    linear

    array([[0.00399693, 0.00344913, 0.00335007, 0.00308586, 0.0029484 ,
            0.00357454],
           [0.00397661, 0.0034324 , 0.00333383, 0.00307077, 0.00293433,
            0.00355839]])

  • bright_targets_histogram
    (tile_line, tile_sample, bt_thresh)
    int64
    0 0 0 0 0 0 0 0 ... 0 0 0 0 0 0 0 0

    long_name :

    bright targets histogram (VV polarization)

    array([[[0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0]],
    
           [[0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0]]])

  • sigma0_filt
    (tile_line, tile_sample)
    float64
    0.1109 0.1162 ... 0.08615 0.08434

    long_name :

    calibrated sigma0 with BT correction

    units :

    linear

    array([[0.11088875, 0.11622112, 0.09905173, 0.09610074, 0.08611807,
            0.0778491 ],
           [0.12396615, 0.12034758, 0.10801527, 0.09761236, 0.08614841,
            0.08433734]])

  • normalized_variance_filt
    (tile_line, tile_sample)
    float64
    1.281 1.232 1.241 ... 1.219 1.215

    long_name :

    normalized variance with BT correction

    array([[1.28079031, 1.23212822, 1.24147954, 1.22033379, 1.23212187,
            1.21705429],
           [1.29556095, 1.24047551, 1.23025591, 1.22390262, 1.21869529,
            1.21498918]])

  • normalized_variance_LPF
    (tile_line, tile_sample)
    float64
    0.0006556 0.001158 ... 0.0002012

    long_name :

    normalized variance low-pass-filter

    cutoff frequency :

    [4750.0, 4750.0]

    array([[0.00065563, 0.00115848, 0.00322536, 0.00038743, 0.00074732,
            0.00064529],
           [0.00101832, 0.00166541, 0.00026059, 0.00021799, 0.00097496,
            0.0002012 ]])

  • xspectra_0tau
    (tile_line, tile_sample, freq_line, freq_sample, 0tau)
    complex128
    (74.46905050391561-1.27138025445...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[7.44690505e+01-1.27138025e-15j,
               4.47159480e+02-1.02705639e-14j,
               2.91962799e+02+3.08228687e-15j],
              [2.62181591e+02-1.16450595e-15j,
               3.77802853e+02-8.55646240e-15j,
               8.43316622e+02+1.19355757e-14j],
              [3.71598997e+02-2.49969726e-15j,
               4.12321703e+02+7.93195935e-15j,
               7.15912789e+01-5.67332826e-17j],
              ...,
              [4.21336523e+02+2.48064386e-15j,
               3.08701397e+02-1.98200486e-16j,
               3.65976366e+01-4.16094480e-16j],
              [1.03735946e+00+3.68637566e-18j,
               9.55081057e+01-7.78744615e-18j,
               2.18390474e+02+1.64079571e-17j],
              [3.48016980e+02+1.11375892e-15j,
               9.35659218e+01-7.64388981e-16j,
               6.08282993e+01-1.64708367e-15j]],
    
    ...
    
             [[6.10164813e+00-5.62782502e-18j,
               2.54140501e+02+8.51257457e-16j,
               4.72099140e+01+2.07592405e-16j],
              [3.20925539e+02+2.63301367e-15j,
               9.20843706e+02-5.87315889e-15j,
               1.94563535e+02+6.47886618e-15j],
              [1.12421471e+02+4.82304274e-16j,
               5.98803850e+01-9.89251307e-17j,
               2.71717113e+00+5.40065489e-18j],
              ...,
              [8.73796471e+01+1.63664627e-15j,
               5.28471805e+01+1.58768423e-15j,
               1.06327846e+02-7.34587516e-16j],
              [1.36306881e+00-9.73995391e-19j,
               1.11492719e+02-4.83757295e-16j,
               9.56685745e+00-1.91019163e-16j],
              [1.61429301e+01-2.51259980e-17j,
               5.09364491e+01-3.68491720e-16j,
               9.27884359e+00+6.46257643e-17j]]]]])

  • xspectra_1tau
    (tile_line, tile_sample, freq_line, freq_sample, 1tau)
    complex128
    (-150.86126148164263+102.6665558...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[-1.50861261e+02+1.02666556e+02j,
                3.24834476e+02+1.58229254e+02j],
              [ 2.00456711e+00+3.14720407e+02j,
                3.08551621e+02-4.72655607e+02j],
              [-3.91082771e+02+1.65105429e+01j,
               -9.36782612e+01+1.44024378e+02j],
              ...,
              [ 3.55213623e+02-6.23735161e+01j,
               -1.02806203e+02+2.69930756e+01j],
              [ 9.08144672e+00-4.07474690e+00j,
                1.44353162e+02-4.49724349e+00j],
              [-1.31556908e+02+1.23512386e+02j,
               -9.49834867e+00-7.48414141e+01j]],
    
             [[ 1.09307625e+02+3.78700910e+02j,
                3.13138563e+02+1.22535094e+02j],
              [-8.61446646e+01+1.00758636e+02j,
                2.17019713e+02+1.13932558e+01j],
              [-1.91712449e+02-5.07623570e+01j,
                1.26756194e+01+7.81495209e+00j],
    ...
              [ 1.25440968e+01-1.58871909e+01j,
                2.42798219e+01-2.14145373e+01j],
              [ 8.13126923e+00+6.58945705e+00j,
                1.21429687e+01-5.12601036e-02j],
              [ 2.47135218e+01-9.24108390e+00j,
                6.99250556e+00-4.11885129e+01j]],
    
             [[-1.98441774e+01+3.40130054e+01j,
               -7.55656192e+00-1.09274194e+02j],
              [ 4.57702685e+02-2.93309589e+02j,
                4.10188598e+02-1.04440990e+02j],
              [ 3.16256049e+01-7.57077414e+01j,
               -1.58201320e+00+1.26571121e+01j],
              ...,
              [-1.22272453e+01-6.68450631e+01j,
                7.08090387e+01-2.46009533e+01j],
              [ 1.21803178e+01+1.90055381e+00j,
               -2.14108375e+01-2.46619339e+01j],
              [ 2.54798376e+01-1.31545205e+01j,
                2.17374578e+01-3.38044079e-01j]]]]])

  • xspectra_2tau
    (tile_line, tile_sample, freq_line, freq_sample, 2tau)
    complex128
    (-145.92062613565918+21.19819095...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[-145.92062614+2.11981910e+01j],
              [ 395.37255053+2.54524341e+02j],
              [  83.08569021-1.40356744e+02j],
              ...,
              [-112.84209012+5.18322647e+01j],
              [  13.53403889-6.58628993e+00j],
              [ 112.1499664 +9.26912405e+01j]],
    
             [[ -27.93459816+3.02799768e+02j],
              [-160.38109057+1.68803702e+02j],
              [ -18.47099718-1.94547812e+01j],
              ...,
              [ -25.48151423+2.78494779e+01j],
              [ -23.71890389+2.05388939e+01j],
              [  27.10067496-8.06581766e+00j]],
    
             [[ -26.97094959+5.99356846e+01j],
              [  78.79848502+1.08740929e+01j],
              [ -85.30772103-2.70993885e-01j],
              ...,
    ...
              ...,
              [  13.13291037+4.85683126e+01j],
              [ -58.88987873+2.20838938e+01j],
              [ -33.96244522+8.94588043e+00j]],
    
             [[ -10.15733842+4.78670709e+01j],
              [  18.43430235-1.29902322e+02j],
              [ -69.18838112+1.32145579e+02j],
              ...,
              [  -1.89134896-3.47177104e+01j],
              [  43.10570297+3.46317679e+01j],
              [  -3.82016374-1.98994618e+01j]],
    
             [[  15.21480245+7.52117476e+00j],
              [ 170.61622681-1.82566455e+02j],
              [  15.16705759+8.68497212e+00j],
              ...,
              [ -47.5002022 -8.38726441e+01j],
              [  -1.9186856 -3.05923693e+00j],
              [  10.78638375-5.78287549e+00j]]]]])

  • doppler_centroid
    (tile_line, tile_sample)
    float64
    -1.485 -1.543 ... -1.519 -1.588

    units :

    rad/m

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[-1.48475755, -1.54311307, -1.57177805, -1.62012094, -1.64182381,
            -1.67720317],
           [-1.40140384, -1.4495084 , -1.4477431 , -1.47550295, -1.51922332,
            -1.58838932]])

  • var_xspectra_0tau
    (tile_line, tile_sample, freq_line, freq_sample, 0tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
    ...
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]]]]])

  • var_xspectra_1tau
    (tile_line, tile_sample, freq_line, freq_sample, 1tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
    ...
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]]]]])

  • var_xspectra_2tau
    (tile_line, tile_sample, freq_line, freq_sample, 2tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
    ...
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]]]]])

  • tau
    (tile_line, tile_sample)
    float64
    0.04182 0.04223 ... 0.04353 0.04399

    long_name :

    delay between two successive looks

    units :

    s

    array([[0.04181913, 0.04223051, 0.04265374, 0.04308851, 0.04353445,
            0.04399133],
           [0.04181902, 0.04223041, 0.04265364, 0.04308841, 0.04353435,
            0.04399122]])

  • burst
    (tile_line)
    int64
    0 0

    array([0, 0])

  • corner_longitude
    (tile_line, tile_sample, c_sample, c_line)
    float64
    -156.0 -156.0 ... -156.8 -156.8

    array([[[[-156.03926292, -156.04859535],
             [-156.08679316, -156.0961099 ]],
    
            [[-156.18190986, -156.1911952 ],
             [-156.22947561, -156.23874527]],
    
            [[-156.3245623 , -156.33380061],
             [-156.3721044 , -156.38132704]],
    
            [[-156.46729168, -156.47648296],
             [-156.51486696, -156.52404258]],
    
            [[-156.61002742, -156.6191717 ],
             [-156.65762836, -156.66675696]],
    
            [[-156.75289874, -156.76199597],
             [-156.80048612, -156.80956768]]],
    
    
           [[[-156.06733885, -156.07667129],
             [-156.11482188, -156.12413861]],
    
            [[-156.20984414, -156.21912948],
             [-156.25736269, -156.26663235]],
    
            [[-156.35235508, -156.36159339],
             [-156.39985004, -156.40907268]],
    
            [[-156.49494297, -156.50413425],
             [-156.54247112, -156.55164673]],
    
            [[-156.6375373 , -156.64668158],
             [-156.68509109, -156.69421969]],
    
            [[-156.7802671 , -156.78936433],
             [-156.82780734, -156.8368889 ]]]])

  • corner_latitude
    (tile_line, tile_sample, c_sample, c_line)
    float64
    22.11 22.07 22.12 ... 22.12 22.07

    array([[[[22.11483716, 22.07064035],
             [22.12348846, 22.07929262]],
    
            [[22.14075701, 22.09656321],
             [22.14936952, 22.10517678]],
    
            [[22.16654153, 22.12235103],
             [22.17510526, 22.13091594]],
    
            [[22.19220736, 22.14802048],
             [22.2007332 , 22.1565476 ]],
    
            [[22.21773932, 22.17355636],
             [22.22622417, 22.18204259]],
    
            [[22.24316261, 22.19898387],
             [22.25159945, 22.20742218]]],
    
    
           [[[21.98187427, 21.93767746],
             [21.99052849, 21.94633264]],
    
            [[22.00780317, 21.96360936],
             [22.0164189 , 21.97222616]],
    
            [[22.03359766, 21.98940716],
             [22.04216492, 21.9979756 ]],
    
            [[22.05927436, 22.01508748],
             [22.06780403, 22.02361843]],
    
            [[22.08481811, 22.04063515],
             [22.09330709, 22.04912551]],
    
            [[22.11025409, 22.06607534],
             [22.11869536, 22.07451809]]]])

  • corner_line
    (tile_line, c_line)
    int64
    31 387 1102 1458

    long_name :

    line number in original digital number matrix

    array([[  31,  387],
           [1102, 1458]])

  • corner_sample
    (tile_line, tile_sample, c_sample)
    int64
    718 1830 4088 ... 16016 18524 19792

    long_name :

    sample number in original digital number matrix

    array([[[  718,  1830],
            [ 4088,  5234],
            [ 7557,  8734],
            [11121, 12329],
            [14777, 16016],
            [18524, 19792]],
    
           [[  718,  1830],
            [ 4088,  5234],
            [ 7557,  8734],
            [11121, 12329],
            [14777, 16016],
            [18524, 19792]]])

  • burst_corner_longitude
    (tile_line, c_sample, c_line)
    float64
    -156.0 -156.0 ... -156.8 -156.9

    long_name :

    corner longitude of burst valid portion

    array([[[-156.01134018, -156.04946732],
            [-156.82786745, -156.86489625]],
    
           [[-156.01134018, -156.04946732],
            [-156.82786745, -156.86489625]]])

  • burst_corner_latitude
    (tile_line, c_sample, c_line)
    float64
    22.11 21.93 22.26 ... 22.26 22.08

    long_name :

    corner latitude of burst valid portion

    array([[[22.11142504, 21.93103525],
            [22.25812018, 22.07781594]],
    
           [[22.11142504, 21.93103525],
            [22.25812018, 22.07781594]]])

  • cwave_params
    (tile_line, tile_sample, k_gp, phi_hf)
    float64
    5.62 0.01268 ... 0.05828 0.07465

    long_name :

    CWAVE parameters (2tau)

    array([[[[ 5.62034972e+00,  1.26755709e-02, -3.91347918e+00,
              -7.76488102e-02,  2.31845722e+00],
             [ 4.01034314e-01,  4.09804315e-02, -2.21800939e+00,
               1.97188294e-02,  1.63488621e+00],
             [-1.02113250e-01, -6.09712192e-02, -1.73212353e-01,
               2.54703454e-02,  6.70668785e-01],
             [ 2.82641704e-02,  1.06535066e-03,  1.87062679e-01,
               7.67566603e-03,  2.77785358e-02]],
    
            [[ 5.55893834e+00, -4.10192853e-02, -3.81472850e+00,
              -2.64676855e-02,  2.12674225e+00],
             [ 4.57430459e-01,  7.54482744e-02, -2.23198737e+00,
              -4.34731079e-02,  1.66173789e+00],
             [-1.03798756e-01, -2.43921997e-02, -2.67744332e-01,
               1.43371021e-02,  7.13396432e-01],
             [ 9.85751805e-02, -2.80856851e-02,  1.83154001e-01,
               3.12300544e-02,  1.45145238e-01]],
    
            [[ 5.59782360e+00, -2.08607130e-02, -3.69761244e+00,
              -1.85941373e-01,  2.04500769e+00],
    ...
             [ 5.43630611e-02, -4.17875167e-03,  1.06748704e-01,
               4.29875794e-02,  1.35305224e-01]],
    
            [[ 5.50986490e+00, -1.07296571e-01, -3.52202862e+00,
              -2.16198358e-01,  2.03742857e+00],
             [ 4.07889144e-01,  1.41884805e-01, -2.38776921e+00,
               7.68178981e-02,  1.67383209e+00],
             [ 2.02616344e-02, -7.82307778e-02, -2.84999778e-01,
              -2.16381039e-02,  8.06112471e-01],
             [ 4.98866934e-02,  3.18354656e-02,  1.42063453e-01,
              -7.93628692e-03,  1.10122187e-01]],
    
            [[ 5.49478348e+00,  6.60919297e-02, -3.76270799e+00,
              -6.14306075e-02,  2.15853187e+00],
             [ 4.88818548e-01,  5.16906549e-03, -2.35565694e+00,
              -7.38565006e-02,  1.67882637e+00],
             [-3.62966015e-02,  2.09986790e-02, -1.77765094e-01,
              -1.37205480e-02,  7.36045853e-01],
             [-1.70232589e-02, -3.80728492e-02,  1.52982732e-01,
               5.82791378e-02,  7.46506611e-02]]]])

  • macs
    (tile_line, tile_sample, lambda_range_max_macs)
    complex128
    (0.7143915766528677-0.0826824656...

    kaz_min :

    -0.010471975511965976

    kaz_max :

    0.010471975511965976

    krg_max :

    0.41887902047863906

    long_name :

    Mean rAnge Cross-Spectrum (2tau)

    array([[[0.71439158-0.08268247j, 1.97176834-0.4570875j ,
             2.50065817-0.3706933j , 3.34615095-0.24503139j,
             4.48843777-0.20680129j, 4.91263865-0.24533341j,
             4.96186744-0.33185884j, 4.96535694-0.33059073j,
             5.0540726 -0.34287964j, 5.05650858-0.33841099j,
             5.03247344-0.36413184j],
            [0.69287383+0.04246967j, 1.19834172+0.01382397j,
             1.61977722+0.03470218j, 2.10864472-0.01659057j,
             2.79075394-0.0169071j , 3.03770112+0.08831723j,
             3.09956309+0.13240826j, 3.15156477+0.08264526j,
             3.12676466+0.06294111j, 3.1792033 +0.07775491j,
             3.17550389+0.11431832j],
            [0.44072658-0.0527954j , 1.63139282+0.26408785j,
             2.09011171+0.27641345j, 2.5651864 +0.3995461j ,
             3.15028302+0.48666403j, 3.41729198+0.43440803j,
             3.42708267+0.40188985j, 3.48835961+0.3971521j ,
             3.49549522+0.42488959j, 3.52293272+0.39417847j,
             3.51700824+0.38218611j],
            [0.36275019-0.04986152j, 1.19231631+0.0181289j ,
             1.90565946+0.33981532j, 2.4990046 +0.38664144j,
    ...
             3.21700151+0.05345477j, 3.24036065+0.07989828j,
             3.22570212+0.09130371j],
            [0.22134728+0.10123762j, 0.6775867 +0.50688521j,
             1.15798347+0.55651185j, 1.77564483+0.69230569j,
             2.33209364+0.79876833j, 2.51776481+0.83859545j,
             2.61534072+0.91785782j, 2.61874991+0.915702j  ,
             2.63212496+0.90025163j, 2.62942504+0.91833658j,
             2.66688068+0.92697517j],
            [0.39116093+0.44969038j, 0.92817575+0.31936272j,
             1.29457811+0.39747184j, 1.74351536+0.44615641j,
             2.12238968+0.53000589j, 2.25692478+0.51931258j,
             2.20389843+0.50329222j, 2.1824835 +0.55302939j,
             2.23182701+0.53165048j, 2.22851559+0.55311574j,
             2.21693141+0.5328845j ],
            [0.26853936-0.16303281j, 0.68658815-0.01616306j,
             1.15228159+0.01143861j, 1.65807728-0.01515143j,
             2.17905657+0.00408473j, 2.4971104 +0.12332538j,
             2.5343705 +0.07221658j, 2.55424267+0.08798125j,
             2.60641086+0.09858738j, 2.59048926+0.11453529j,
             2.56362973+0.123034j  ]]])

  • azimuth_cutoff
    (tile_line, tile_sample)
    float64
    265.5 252.5 243.0 ... 228.9 240.4

    long_name :

    Azimuthal cut-off (2tau)

    units :

    m

    array([[265.47304538, 252.47956595, 243.00079782, 251.43169848,
            293.3550609 , 232.08512878],
           [233.24422054, 248.52112662, 242.12760991, 230.58733944,
            228.94989088, 240.42575338]])

  • azimuth_cutoff_error
    (tile_line, tile_sample)
    float64
    0.06312 0.07286 ... 0.1115 0.1226

    long_name :

    normalized azimuthal cut-off error std (2tau)

    array([[0.06311682, 0.0728629 , 0.09350413, 0.12153069, 0.09258427,
            0.08551442],
           [0.12298411, 0.09922876, 0.12272042, 0.10831973, 0.11147017,
            0.12255127]])

• Indexes: (4)
  • bt_thresh
    PandasIndex

    PandasIndex(Index([5, 50, 100, 150, 200], dtype='int64', name='bt_thresh'))

  • k_gp
    PandasIndex

    PandasIndex(Index([1, 2, 3, 4], dtype='int64', name='k_gp'))

  • phi_hf
    PandasIndex

    PandasIndex(Index([1, 2, 3, 4, 5], dtype='int64', name='phi_hf'))

  • lambda_range_max_macs
    PandasIndex

    PandasIndex(Index([25.0, 50.0, 75.0, 100.0, 125.0, 150.0, 175.0, 200.0, 225.0, 250.0,
           275.0],
          dtype='float64', name='lambda_range_max_macs'))

• Attributes: (24)

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.51

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-05-07 16:24:11.657511

  stop_date :

  2022-05-07 16:24:39.551410

  footprint :

  POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

  coverage :

  190km * 86km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -167.7204378813183

  comment :

  denoised digital number, read at full resolution

  history :

  digital_number: measurement/s1a-iw1-slc-v*-20220507t162411-20220507t162439-043107-0525de-00*.tiff

  azimuth_steering_rate :

  1.590368784

  radar_frequency :

  5405000454.33435

  azimuth_time_interval :

  0.002055556299999998

  required_tile_width_sample :

  5000.0

  required_tile_width_line :

  5000.0

  required_tile_overlap_sample :

  -10000.0

  required_tile_overlap_line :

  -10000.0

import xarray as xr
IR_path = '/tmp/IRs/S1_IR_IW1.nc' # this is the output file of the method merge_IR_polarization()
new_ir = xr.open_dataset(IR_path,engine='h5netcdf')
new_ir

<xarray.Dataset> Size: 55kB
Dimensions:         (pol: 2, k_srg: 2048, k_az: 256)
Coordinates:
  * pol             (pol) <U2 16B 'VH' 'VV'
  * k_srg           (k_srg) float64 16kB -1.349 -1.347 -1.346 ... 1.346 1.347
  * k_az            (k_az) float64 2kB -0.2236 -0.2219 -0.2201 ... 0.2201 0.2219
Data variables:
    range_IR        (pol, k_srg) float64 33kB ...
    mean_incidence  (pol) float64 16B ...
    azimuth_IR      (pol, k_az) float64 4kB ...
Attributes: (12/21)
    long_name:              Impulse response in range direction
    name:                   SENTINEL1_DS:/home/datawork-cersat-public/cache/p...
    short_name:             SENTINEL1_DS:S1A_IW_SLC__1SDV_20220928T095555_202...
    product:                SLC
    safe:                   S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_...
    swath:                  IW
    ...                     ...
    platform_heading:       -168.0316299165244
    comment:                denoised digital number, read at full resolution
    history:                digital_number: measurement/s1a-iw1-slc-v*-202209...
    radar_frequency:        5405000454.33435
    azimuth_time_interval:  0.002055556299999998
    subswath:               IW1

xarray.Dataset

• Dimensions:
  • pol: 2
  • k_srg: 2048
  • k_az: 256
• Coordinates: (3)
  • pol
    (pol)
    <U2
    'VH' 'VV'

    array(['VH', 'VV'], dtype='<U2')

  • k_srg
    (k_srg)
    float64
    -1.349 -1.347 ... 1.346 1.347

    long_name :

    wavenumber in slant range direction

    units :

    rad/m

    array([-1.348577, -1.34726 , -1.345943, ...,  1.344626,  1.345943,  1.34726 ])

  • k_az
    (k_az)
    float64
    -0.2236 -0.2219 ... 0.2201 0.2219

    long_name :

    wavenumber in azimuth direction

    units :

    rad/m

    array([-0.223626, -0.221879, -0.220132, ...,  0.218385,  0.220132,  0.221879])

• Data variables: (3)
  • range_IR
    (pol, k_srg)
    float64
    ...

    [4096 values with dtype=float64]

  • mean_incidence
    (pol)
    float64
    ...

    long_name :

    incidence at middle tile

    units :

    degree

    [2 values with dtype=float64]

  • azimuth_IR
    (pol, k_az)
    float64
    ...

    [512 values with dtype=float64]

• Indexes: (3)
  • pol
    PandasIndex

    PandasIndex(Index(['VH', 'VV'], dtype='object', name='pol'))

  • k_srg
    PandasIndex

    PandasIndex(Index([-1.3485765365290956, -1.3472595672551413, -1.3459425979811872,
            -1.344625628707233, -1.3433086594332788, -1.3419916901593245,
           -1.3406747208853704, -1.3393577516114161,  -1.338040782337462,
           -1.3367238130635077,
           ...
            1.3354068437895537,  1.3367238130635077,   1.338040782337462,
            1.3393577516114161,  1.3406747208853704,  1.3419916901593245,
            1.3433086594332788,   1.344625628707233,  1.3459425979811872,
            1.3472595672551413],
          dtype='float64', name='k_srg', length=2048))

  • k_az
    PandasIndex

    PandasIndex(Index([ -0.2236262077765237, -0.22187912802826962,  -0.2201320482800155,
           -0.21838496853176143, -0.21663788878350734, -0.21489080903525323,
           -0.21314372928699915, -0.21139664953874507, -0.20964956979049096,
           -0.20790249004223688,
           ...
             0.2061554102939828,  0.20790249004223688,  0.20964956979049096,
            0.21139664953874507,  0.21314372928699915,  0.21489080903525323,
            0.21663788878350734,  0.21838496853176143,   0.2201320482800155,
            0.22187912802826962],
          dtype='float64', name='k_az', length=256))

• Attributes: (21)

  long_name :

  Impulse response in range direction

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/271/S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220928T095555_20220928T095622_045203_056722_FB4F.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.52

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-09-28 09:55:57.799098

  stop_date :

  2022-09-28 09:56:22.922107

  footprint :

  POLYGON ((-62.23754368024279 -1.858692573563884, -63.01619444502543 -1.689763260246732, -63.34014112580896 -3.207344140643747, -62.56008100344361 -3.377844796320056, -62.23754368024279 -1.858692573563884))

  coverage :

  172km * 88km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -168.0316299165244

  comment :

  denoised digital number, read at full resolution

  history :

  digital_number: measurement/s1a-iw1-slc-v*-20220928t095557-20220928t095622-045203-056722-00*.tiff

  radar_frequency :

  5405000454.33435

  azimuth_time_interval :

  0.002055556299999998

  subswath :

  IW1

xsarobj = xsar.Sentinel1Dataset(str_gdal) #,resolution='30m'
dt = xsarobj.datatree
dt.load()
dt['measurement']

<xarray.DatasetView> Size: 5GB
Dimensions:         (pol: 2, line: 14900, sample: 20566)
Coordinates:
  * line            (line) int64 119kB 0 1 2 3 4 ... 14896 14897 14898 14899
  * sample          (sample) int64 165kB 0 1 2 3 4 ... 20562 20563 20564 20565
  * pol             (pol) object 16B 'VV' 'VH'
Data variables:
    digital_number  (pol, line, sample) complex64 5GB 0j 0j 0j 0j ... 0j 0j 0j
    time            (line) datetime64[ns] 119kB 2022-05-07T16:24:11.657340 .....
    sampleSpacing   float64 8B 2.33
    lineSpacing     float64 8B 14.0
Attributes: (12/15)
    name:              SENTINEL1_DS:/home/datawork-cersat-public/cache/projec...
    short_name:        SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507...
    product:           SLC
    safe:              S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_04310...
    swath:             IW
    multidataset:      False
    ...                ...
    start_date:        2022-05-07 16:24:11.657511
    stop_date:         2022-05-07 16:24:39.551410
    footprint:         POLYGON ((-156.007554522451 22.11305598776757, -156.82...
    coverage:          190km * 86km (line * sample )
    orbit_pass:        Descending
    platform_heading:  -167.7204378813183

xarray.DataTree

• Groups: (0)
• Dimensions:
  • pol: 2
  • line: 14900
  • sample: 20566
• Coordinates: (3)
  • line
    (line)
    int64
    0 1 2 3 ... 14896 14897 14898 14899

    array([    0,     1,     2, ..., 14897, 14898, 14899])

  • sample
    (sample)
    int64
    0 1 2 3 ... 20562 20563 20564 20565

    array([    0,     1,     2, ..., 20563, 20564, 20565])

  • pol
    (pol)
    object
    'VV' 'VH'

    array(['VV', 'VH'], dtype=object)

• Inherited coordinates: (0)
• Data variables: (4)
  • digital_number
    (pol, line, sample)
    complex64
    0j 0j 0j 0j 0j ... 0j 0j 0j 0j 0j

    comment :

    denoised digital number, read at full resolution

    history :

    digital_number: measurement/s1a-iw1-slc-v*-20220507t162411-20220507t162439-043107-0525de-00*.tiff

    array([[[ 0.+0.j,  0.+0.j,  0.+0.j, ...,  1.-2.j,  0.-4.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  2.+0.j,  2.-5.j,  2.-2.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+1.j,  1.-1.j,  2.-1.j],
            ...,
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j]],
    
           [[ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+1.j, -2.+0.j, -1.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ..., -1.+1.j, -1.+1.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ..., -2.+0.j,  0.+2.j,  0.+1.j],
            ...,
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j],
            [ 0.+0.j,  0.+0.j,  0.+0.j, ...,  0.+0.j,  0.+0.j,  0.+0.j]]],
          dtype=complex64)

  • time
    (line)
    datetime64[ns]
    2022-05-07T16:24:11.657340 ... 2...

    description :

    azimuth times interpolated along line dimension at the middle of range dimension

    array(['2022-05-07T16:24:11.657340000', '2022-05-07T16:24:11.659395556',
           '2022-05-07T16:24:11.661451112', ...,
           '2022-05-07T16:24:39.547127772', '2022-05-07T16:24:39.549183328',
           '2022-05-07T16:24:39.551238884'], dtype='datetime64[ns]')

  • sampleSpacing
    ()
    float64
    2.33

    units :

    m

    referential :

    slant

    array(2.329562)

  • lineSpacing
    ()
    float64
    14.0

    units :

    m

    array(14.00234)

• Attributes: (15)

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.51

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-05-07 16:24:11.657511

  stop_date :

  2022-05-07 16:24:39.551410

  footprint :

  POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

  coverage :

  190km * 86km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -167.7204378813183

# print(dt)
polarization = 'VV'
for g in dt.groups:
    # print(g)
    if 'pol' in dt[g].coords:
        print('pol present',g)
        dt[g].sel(pol=polarization)
    else:
        print('pol absent',g)

# 'pol' in dt['intraburst'].coords

pol absent /
pol present /measurement
pol absent /geolocation_annotation
pol absent /bursts
pol absent /FMrate
pol absent /doppler_estimate
pol absent /orbit
pol absent /image
pol present /calibration
pol present /noise_range
pol present /noise_azimuth
pol absent /antenna_pattern
pol absent /swath_merging
pol absent /recalibration

compute a second time the cross spectra with Impulse Response

 # compute the same cross spectra but using Impulse Response
intra_xs_with_IR = xsarslc.processing.xspectra.compute_IW_subswath_intraburst_xspectra(dt,
                                         tile_width={'sample': 5.e3, 'line': 5.e3},
                                         tile_overlap={'sample': -10.e3, 'line': -10.e3},
                                         periodo_width = {'sample': 4000, 'line': 4000},
                                        periodo_overlap = {'sample': 2000, 'line': 2000},
                                        polarization='VV',
                                        dev=True,IR_path=IR_path)
intra_xs_with_IR

intrabursts: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:06<00:00,  6.50s/it]

<xarray.Dataset> Size: 44MB
Dimensions:                   (tile_sample: 6, tile_line: 2, bt_thresh: 5,
                               0tau: 3, freq_line: 57, freq_sample: 446,
                               1tau: 2, 2tau: 1, c_sample: 2, c_line: 2,
                               k_gp: 4, phi_hf: 5, lambda_range_max_macs: 11)
Coordinates:
    pol                       <U2 8B 'VV'
  * bt_thresh                 (bt_thresh) int64 40B 5 50 100 150 200
    k_rg                      (tile_line, tile_sample, freq_sample) float64 43kB ...
    k_az                      (freq_line) float64 456B -0.04409 ... 0.04409
    line                      (tile_line) int64 16B 209 1280
    sample                    (tile_line, tile_sample) int64 96B 1274 ... 19158
    longitude                 (tile_line, tile_sample) float64 96B -156.1 ......
    latitude                  (tile_line, tile_sample) float64 96B 22.1 ... 2...
  * k_gp                      (k_gp) int64 32B 1 2 3 4
  * phi_hf                    (phi_hf) int64 40B 1 2 3 4 5
  * lambda_range_max_macs     (lambda_range_max_macs) float64 88B 25.0 ... 275.0
Dimensions without coordinates: tile_sample, tile_line, 0tau, freq_line,
                                freq_sample, 1tau, 2tau, c_sample, c_line
Data variables: (12/30)
    incidence                 (tile_line, tile_sample) float64 96B 31.21 ... ...
    ground_heading            (tile_line, tile_sample) float64 96B -168.9 ......
    sensing_time              (tile_line, tile_sample) datetime64[ns] 96B 202...
    tile_width_sample         (tile_line, tile_sample) int64 96B 5003 ... 5002
    tile_width_line           (tile_line, tile_sample) int64 96B 4998 ... 4998
    sigma0                    (tile_line, tile_sample) float64 96B 0.1109 ......
    ...                        ...
    burst_corner_longitude    (tile_line, c_sample, c_line) float64 64B -156....
    burst_corner_latitude     (tile_line, c_sample, c_line) float64 64B 22.11...
    cwave_params              (tile_line, tile_sample, k_gp, phi_hf) float64 2kB ...
    macs                      (tile_line, tile_sample, lambda_range_max_macs) complex128 2kB ...
    azimuth_cutoff            (tile_line, tile_sample) float64 96B 251.7 ... ...
    azimuth_cutoff_error      (tile_line, tile_sample) float64 96B 0.05023 .....
Attributes: (12/24)
    name:                          SENTINEL1_DS:/home/datawork-cersat-public/...
    short_name:                    SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162...
    product:                       SLC
    safe:                          S1A_IW_SLC__1SDV_20220507T162411_20220507T...
    swath:                         IW
    multidataset:                  False
    ...                            ...
    radar_frequency:               5405000454.33435
    azimuth_time_interval:         0.002055556299999998
    required_tile_width_sample:    5000.0
    required_tile_width_line:      5000.0
    required_tile_overlap_sample:  -10000.0
    required_tile_overlap_line:    -10000.0

xarray.Dataset

• Dimensions:
  • tile_sample: 6
  • tile_line: 2
  • bt_thresh: 5
  • 0tau: 3
  • freq_line: 57
  • freq_sample: 446
  • 1tau: 2
  • 2tau: 1
  • c_sample: 2
  • c_line: 2
  • k_gp: 4
  • phi_hf: 5
  • lambda_range_max_macs: 11
• Coordinates: (11)
  • pol
    ()
    <U2
    'VV'

    array('VV', dtype='<U2')

  • bt_thresh
    (bt_thresh)
    int64
    5 50 100 150 200

    long_name :

    lower edge of bright target to background amplitude ratio

    array([  5,  50, 100, 150, 200])

  • k_rg
    (tile_line, tile_sample, freq_sample)
    float64
    0.0 0.00157 ... 0.6972 0.6988

    long_name :

    wavenumber in range direction

    units :

    rad/m

    array([[[0.        , 0.00157028, 0.00314056, ..., 0.69563443,
             0.69720471, 0.698775  ],
            [0.        , 0.00157122, 0.00314245, ..., 0.69605158,
             0.69762281, 0.69919403],
            [0.        , 0.00157078, 0.00314155, ..., 0.69585426,
             0.69742504, 0.69899582],
            [0.        , 0.00157076, 0.00314151, ..., 0.69584461,
             0.69741537, 0.69898612],
            [0.        , 0.00157109, 0.00314219, ..., 0.69599453,
             0.69756563, 0.69913672],
            [0.        , 0.00157029, 0.00314057, ..., 0.69563637,
             0.69720666, 0.69877694]],
    
           [[0.        , 0.00157036, 0.00314072, ..., 0.69566877,
             0.69723912, 0.69880948],
            [0.        , 0.00157129, 0.00314259, ..., 0.69608337,
             0.69765466, 0.69922596],
            [0.        , 0.00157084, 0.00314169, ..., 0.69588375,
             0.6974546 , 0.69902544],
            [0.        , 0.00157082, 0.00314163, ..., 0.69587205,
             0.69744287, 0.69901369],
            [0.        , 0.00157115, 0.0031423 , ..., 0.69602013,
             0.69759129, 0.69916244],
            [0.        , 0.00157034, 0.00314068, ..., 0.69566029,
             0.69723063, 0.69880097]]])

  • k_az
    (freq_line)
    float64
    -0.04409 -0.04251 ... 0.04409

    long_name :

    wavenumber in azimuth direction

    units :

    rad/m

    spacing :

    0.0015744699982801337

    array([-0.04408516, -0.04251069, -0.04093622, -0.03936175, -0.03778728,
           -0.03621281, -0.03463834, -0.03306387, -0.0314894 , -0.02991493,
           -0.02834046, -0.02676599, -0.02519152, -0.02361705, -0.02204258,
           -0.02046811, -0.01889364, -0.01731917, -0.0157447 , -0.01417023,
           -0.01259576, -0.01102129, -0.00944682, -0.00787235, -0.00629788,
           -0.00472341, -0.00314894, -0.00157447,  0.        ,  0.00157447,
            0.00314894,  0.00472341,  0.00629788,  0.00787235,  0.00944682,
            0.01102129,  0.01259576,  0.01417023,  0.0157447 ,  0.01731917,
            0.01889364,  0.02046811,  0.02204258,  0.02361705,  0.02519152,
            0.02676599,  0.02834046,  0.02991493,  0.0314894 ,  0.03306387,
            0.03463834,  0.03621281,  0.03778728,  0.03936175,  0.04093622,
            0.04251069,  0.04408516])

  • line
    (tile_line)
    int64
    209 1280

    array([ 209, 1280])

  • sample
    (tile_line, tile_sample)
    int64
    1274 4661 8146 ... 15397 19158

    array([[ 1274,  4661,  8146, 11725, 15397, 19158],
           [ 1274,  4661,  8146, 11725, 15397, 19158]])

  • longitude
    (tile_line, tile_sample)
    float64
    -156.1 -156.2 ... -156.7 -156.8

    array([[-156.06775206, -156.21035178, -156.35304699, -156.49569908,
            -156.63848843, -156.78126404],
           [-156.09580433, -156.23826244, -156.3808161 , -156.52332678,
            -156.66597464, -156.8086088 ]])

  • latitude
    (tile_line, tile_sample)
    float64
    22.1 22.12 22.15 ... 22.07 22.09

    array([[22.09707782, 22.12297099, 22.14874894, 22.17438323, 22.19990997,
            22.22529794],
           [21.96411638, 21.99001875, 22.01580682, 22.04145214, 22.06699082,
            22.09239162]])

  • k_gp
    (k_gp)
    int64
    1 2 3 4

    long_name :

    Gegenbauer polynoms dimension

    array([1, 2, 3, 4])

  • phi_hf
    (phi_hf)
    int64
    1 2 3 4 5

    long_name :

    Harmonic functions dimension (odd number)

    array([1, 2, 3, 4, 5])

  • lambda_range_max_macs
    (lambda_range_max_macs)
    float64
    25.0 50.0 75.0 ... 250.0 275.0

    long_name :

    maximum wavelength bound for MACS estimation

    array([ 25.,  50.,  75., 100., 125., 150., 175., 200., 225., 250., 275.])

• Data variables: (30)
  • incidence
    (tile_line, tile_sample)
    float64
    31.21 32.25 33.27 ... 35.26 36.22

    long_name :

    incidence at tile middle

    units :

    degree

    array([[31.20873866, 32.24999523, 33.27137238, 34.27440195, 35.25793403,
            36.223318  ],
           [31.21045183, 32.2516462 , 33.27296578, 34.27594172, 35.25942386,
            36.22476108]])

  • ground_heading
    (tile_line, tile_sample)
    float64
    -168.9 -169.0 ... -169.1 -169.2

    long_name :

    ground heading

    units :

    degree

    convention :

    from North clockwise

    array([[-168.92803327, -168.98376967, -169.03937287, -169.09489514,
            -169.15032438, -169.2057274 ],
           [-168.91790251, -168.97367489, -169.02931426, -169.08487291,
            -169.14033873, -169.19577858]])

  • sensing_time
    (tile_line, tile_sample)
    datetime64[ns]
    2022-05-07T16:24:12.895957 ... 2...

    long_name :

    tile sensing time

    array([['2022-05-07T16:24:12.895957000', '2022-05-07T16:24:12.894957000',
            '2022-05-07T16:24:12.894957000', '2022-05-07T16:24:12.893957000',
            '2022-05-07T16:24:12.892957000', '2022-05-07T16:24:12.891957000'],
           ['2022-05-07T16:24:13.411957000', '2022-05-07T16:24:13.406957000',
            '2022-05-07T16:24:13.402957000', '2022-05-07T16:24:13.397957000',
            '2022-05-07T16:24:13.392957000', '2022-05-07T16:24:13.387957000']],
          dtype='datetime64[ns]')

  • tile_width_sample
    (tile_line, tile_sample)
    int64
    5003 5007 5002 ... 5000 5003 5002

    long_name :

    tile width in sample direction

    units :

    m

    array([[5003, 5007, 5002, 5001, 5004, 5002],
           [5003, 5007, 5001, 5000, 5003, 5002]])

  • tile_width_line
    (tile_line, tile_sample)
    int64
    4998 4998 4998 ... 4998 4998 4998

    long_name :

    tile width in line direction

    units :

    m

    array([[4998, 4998, 4998, 4998, 4998, 4998],
           [4998, 4998, 4998, 4998, 4998, 4998]])

  • sigma0
    (tile_line, tile_sample)
    float64
    0.1109 0.1162 ... 0.08615 0.08434

    long_name :

    RAW calibrated sigma0

    units :

    linear

    array([[0.11088875, 0.11622112, 0.09905173, 0.09610074, 0.08611807,
            0.0778491 ],
           [0.12396615, 0.12034758, 0.10801527, 0.09761236, 0.08614841,
            0.08433734]])

  • nesz
    (tile_line, tile_sample)
    float64
    0.003997 0.003449 ... 0.003558

    long_name :

    RAW noise-equivalent sigma zero

    units :

    linear

    array([[0.00399693, 0.00344913, 0.00335007, 0.00308586, 0.0029484 ,
            0.00357454],
           [0.00397661, 0.0034324 , 0.00333383, 0.00307077, 0.00293433,
            0.00355839]])

  • bright_targets_histogram
    (tile_line, tile_sample, bt_thresh)
    int64
    0 0 0 0 0 0 0 0 ... 0 0 0 0 0 0 0 0

    long_name :

    bright targets histogram (VV polarization)

    array([[[0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0]],
    
           [[0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0],
            [0, 0, 0, 0, 0]]])

  • sigma0_filt
    (tile_line, tile_sample)
    float64
    0.1109 0.1162 ... 0.08615 0.08434

    long_name :

    calibrated sigma0 with BT correction

    units :

    linear

    array([[0.11088875, 0.11622112, 0.09905173, 0.09610074, 0.08611807,
            0.0778491 ],
           [0.12396615, 0.12034758, 0.10801527, 0.09761236, 0.08614841,
            0.08433734]])

  • normalized_variance_filt
    (tile_line, tile_sample)
    float64
    1.281 1.232 1.241 ... 1.219 1.215

    long_name :

    normalized variance with BT correction

    array([[1.28079031, 1.23212822, 1.24147954, 1.22033379, 1.23212187,
            1.21705429],
           [1.29556095, 1.24047551, 1.23025591, 1.22390262, 1.21869529,
            1.21498918]])

  • normalized_variance_LPF
    (tile_line, tile_sample)
    float64
    0.0006556 0.001158 ... 0.0002012

    long_name :

    normalized variance low-pass-filter

    cutoff frequency :

    [4750.0, 4750.0]

    array([[0.00065563, 0.00115848, 0.00322536, 0.00038743, 0.00074732,
            0.00064529],
           [0.00101832, 0.00166541, 0.00026059, 0.00021799, 0.00097496,
            0.0002012 ]])

  • xspectra_0tau
    (tile_line, tile_sample, freq_line, freq_sample, 0tau)
    complex128
    (101.17790189078859+1.8863469861...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[1.01177902e+02+1.88634699e-16j,
               3.49162091e+02+3.24028842e-15j,
               1.91615683e+02-3.04249854e-15j],
              [9.67982061e+01+6.54200947e-17j,
               5.02607212e+02+1.12658306e-15j,
               8.37523070e+02-6.88987716e-15j],
              [4.20935640e+02-2.62835530e-15j,
               1.98952495e+02+3.48588313e-15j,
               7.85843880e+01-8.11969422e-16j],
              ...,
              [5.61672922e+02-1.64004992e-14j,
               4.85649126e+02-1.79671316e-15j,
               2.68025818e+01+8.83111905e-17j],
              [1.17906049e+00+2.03528305e-17j,
               1.51354368e+02+3.90001400e-15j,
               3.02730001e+02-3.04255933e-15j],
              [5.88693751e+02-2.38080312e-16j,
               1.29902818e+02+2.66995564e-15j,
               1.46932412e+02+2.93401392e-15j]],
    
    ...
    
             [[7.65532139e+00-3.71721847e-17j,
               3.18686240e+02+2.87009852e-15j,
               9.19805460e+01-7.24161759e-16j],
              [2.16957239e+02+1.00459460e-16j,
               8.86420019e+02-1.12280326e-14j,
               1.73398424e+02-2.65905136e-15j],
              [1.50368701e+02-2.24505016e-15j,
               2.87036721e+00-1.90248405e-17j,
               4.07730173e+01+1.37766233e-15j],
              ...,
              [1.61807422e+02-3.40378546e-15j,
               9.93193963e+01+4.77081509e-16j,
               1.68515638e+02-4.32747487e-16j],
              [6.25162665e+00+7.06845695e-17j,
               1.38739619e+02-3.28014589e-15j,
               6.41965493e+00-2.00832225e-16j],
              [4.79231068e+00-2.95949040e-17j,
               1.02527427e+02+1.35304192e-15j,
               2.56444811e+01+6.55297599e-17j]]]]])

  • xspectra_1tau
    (tile_line, tile_sample, freq_line, freq_sample, 1tau)
    complex128
    (-184.17854297043917-37.49336088...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[-1.84178543e+02-3.74933609e+01j,
                1.40338424e+01+2.58278888e+02j],
              [ 6.17574548e+01+2.11748656e+02j,
                3.03723714e+02-5.73321063e+02j],
              [-2.50940398e+02-1.44135742e+02j,
               -7.76369215e+01+9.80156542e+01j],
              ...,
              [ 4.90826589e+02-1.78508328e+02j,
               -1.03339223e+02+4.83493060e+01j],
              [-9.22020551e+00+9.66663155e+00j,
                2.12563273e+02-2.52262292e+01j],
              [-1.85827773e+02+2.04795059e+02j,
               -9.96039873e+00-1.37795954e+02j]],
    
             [[ 1.26519292e+01+1.55587281e+02j,
                1.99917640e+02+8.54455355e+01j],
              [-3.24079955e+01+6.49089557e+01j,
                1.84747040e+02-9.46300853e+01j],
              [-1.73038227e+02-8.01321037e+00j,
               -2.11578317e+01+1.30196002e+01j],
    ...
              [-6.30566841e+00-2.73291945e+01j,
                5.48223106e+01-3.36583016e+01j],
              [ 1.08530689e+01+3.76705439e+00j,
                6.17670390e+00-1.49255914e+00j],
              [ 3.25320544e+01-1.39261505e+01j,
               -5.85321589e+00-5.63162113e+01j]],
    
             [[-1.91358841e+01+4.55352998e+01j,
               -1.68965647e+02+2.76323085e+01j],
              [ 4.20786456e+02-1.23507081e+02j,
                3.60851586e+02-1.53264370e+02j],
              [ 1.39053642e+01-1.54354863e+01j,
                7.01802118e+00+8.23291628e+00j],
              ...,
              [-1.76570075e+01-1.25534240e+02j,
                1.23693184e+02-3.79060374e+01j],
              [ 2.45032147e+01-1.63383221e+01j,
               -1.98582321e+01-2.22780407e+01j],
              [ 2.11376632e+01+6.67401534e+00j,
                4.80620016e+01-1.78691546e+01j]]]]])

  • xspectra_2tau
    (tile_line, tile_sample, freq_line, freq_sample, 2tau)
    complex128
    (20.331562571242628-137.74578171...

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[ 2.03315626e+01-1.37745782e+02j],
              [ 2.78860240e+02+5.75125824e+01j],
              [ 1.68933790e+02-6.73820754e+01j],
              ...,
              [-8.66693305e+01+8.68487857e+01j],
              [-1.13377924e+01+1.51126254e+01j],
              [ 2.31487273e+02+1.81416193e+02j]],
    
             [[-6.48391789e+01+1.93861060e+02j],
              [ 1.35139991e+00+1.31240993e+02j],
              [ 4.35289067e+01-2.40837008e+01j],
              ...,
              [-1.60153746e+01+4.46227663e+01j],
              [-4.96271499e+01+4.63811811e+01j],
              [ 6.85791446e+01+6.19719900e+00j]],
    
             [[-5.64449596e+01+4.08279390e+01j],
              [ 1.62954728e+01-1.73426203e+01j],
              [-5.30982880e+01+7.36359009e+00j],
              ...,
    ...
              ...,
              [ 9.47820122e+00+1.23992000e+01j],
              [-6.77208578e+01+2.80420305e+01j],
              [-4.17568486e+01-1.86939403e+01j]],
    
             [[-6.57483187e+01+2.07740423e+01j],
              [ 7.71847569e+00-1.04268388e+02j],
              [-1.38319653e+02+1.24925040e+02j],
              ...,
              [-2.55077800e+01-2.59202820e+01j],
              [ 4.52047764e+01+4.39807417e+00j],
              [-1.67203288e+01-3.00303062e+01j]],
    
             [[ 6.19751135e+00-2.58017731e+01j],
              [ 1.49942716e+02-1.23033432e+02j],
              [ 7.82712420e+01+2.14436998e+00j],
              ...,
              [-6.99013220e+01-1.49602427e+02j],
              [-6.13073854e+00-1.59603595e+00j],
              [ 1.10719389e+01-5.55418546e-01j]]]]])

  • doppler_centroid
    (tile_line, tile_sample)
    float64
    -1.485 -1.543 ... -1.519 -1.588

    units :

    rad/m

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[-1.48475755, -1.54311307, -1.57177805, -1.62012094, -1.64182381,
            -1.67720317],
           [-1.40140384, -1.4495084 , -1.4477431 , -1.47550295, -1.51922332,
            -1.58838932]])

  • var_xspectra_0tau
    (tile_line, tile_sample, freq_line, freq_sample, 0tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
    ...
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]],
    
             [[0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.],
              ...,
              [0., 0., 0.],
              [0., 0., 0.],
              [0., 0., 0.]]]]])

  • var_xspectra_1tau
    (tile_line, tile_sample, freq_line, freq_sample, 1tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
    ...
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]],
    
             [[0., 0.],
              [0., 0.],
              [0., 0.],
              ...,
              [0., 0.],
              [0., 0.],
              [0., 0.]]]]])

  • var_xspectra_2tau
    (tile_line, tile_sample, freq_line, freq_sample, 2tau)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    averaged_periodograms :

    1

    periodo_width_sample :

    4000

    periodo_width_line :

    4000

    periodo_overlap_sample :

    2000

    periodo_overlap_line :

    2000

    array([[[[[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
    ...
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]],
    
             [[0.],
              [0.],
              [0.],
              ...,
              [0.],
              [0.],
              [0.]]]]])

  • tau
    (tile_line, tile_sample)
    float64
    0.04182 0.04223 ... 0.04353 0.04399

    long_name :

    delay between two successive looks

    units :

    s

    array([[0.04181913, 0.04223051, 0.04265374, 0.04308851, 0.04353445,
            0.04399133],
           [0.04181902, 0.04223041, 0.04265364, 0.04308841, 0.04353435,
            0.04399122]])

  • burst
    (tile_line)
    int64
    0 0

    array([0, 0])

  • corner_longitude
    (tile_line, tile_sample, c_sample, c_line)
    float64
    -156.0 -156.0 ... -156.8 -156.8

    array([[[[-156.03926292, -156.04859535],
             [-156.08679316, -156.0961099 ]],
    
            [[-156.18190986, -156.1911952 ],
             [-156.22947561, -156.23874527]],
    
            [[-156.3245623 , -156.33380061],
             [-156.3721044 , -156.38132704]],
    
            [[-156.46729168, -156.47648296],
             [-156.51486696, -156.52404258]],
    
            [[-156.61002742, -156.6191717 ],
             [-156.65762836, -156.66675696]],
    
            [[-156.75289874, -156.76199597],
             [-156.80048612, -156.80956768]]],
    
    
           [[[-156.06733885, -156.07667129],
             [-156.11482188, -156.12413861]],
    
            [[-156.20984414, -156.21912948],
             [-156.25736269, -156.26663235]],
    
            [[-156.35235508, -156.36159339],
             [-156.39985004, -156.40907268]],
    
            [[-156.49494297, -156.50413425],
             [-156.54247112, -156.55164673]],
    
            [[-156.6375373 , -156.64668158],
             [-156.68509109, -156.69421969]],
    
            [[-156.7802671 , -156.78936433],
             [-156.82780734, -156.8368889 ]]]])

  • corner_latitude
    (tile_line, tile_sample, c_sample, c_line)
    float64
    22.11 22.07 22.12 ... 22.12 22.07

    array([[[[22.11483716, 22.07064035],
             [22.12348846, 22.07929262]],
    
            [[22.14075701, 22.09656321],
             [22.14936952, 22.10517678]],
    
            [[22.16654153, 22.12235103],
             [22.17510526, 22.13091594]],
    
            [[22.19220736, 22.14802048],
             [22.2007332 , 22.1565476 ]],
    
            [[22.21773932, 22.17355636],
             [22.22622417, 22.18204259]],
    
            [[22.24316261, 22.19898387],
             [22.25159945, 22.20742218]]],
    
    
           [[[21.98187427, 21.93767746],
             [21.99052849, 21.94633264]],
    
            [[22.00780317, 21.96360936],
             [22.0164189 , 21.97222616]],
    
            [[22.03359766, 21.98940716],
             [22.04216492, 21.9979756 ]],
    
            [[22.05927436, 22.01508748],
             [22.06780403, 22.02361843]],
    
            [[22.08481811, 22.04063515],
             [22.09330709, 22.04912551]],
    
            [[22.11025409, 22.06607534],
             [22.11869536, 22.07451809]]]])

  • corner_line
    (tile_line, c_line)
    int64
    31 387 1102 1458

    long_name :

    line number in original digital number matrix

    array([[  31,  387],
           [1102, 1458]])

  • corner_sample
    (tile_line, tile_sample, c_sample)
    int64
    718 1830 4088 ... 16016 18524 19792

    long_name :

    sample number in original digital number matrix

    array([[[  718,  1830],
            [ 4088,  5234],
            [ 7557,  8734],
            [11121, 12329],
            [14777, 16016],
            [18524, 19792]],
    
           [[  718,  1830],
            [ 4088,  5234],
            [ 7557,  8734],
            [11121, 12329],
            [14777, 16016],
            [18524, 19792]]])

  • burst_corner_longitude
    (tile_line, c_sample, c_line)
    float64
    -156.0 -156.0 ... -156.8 -156.9

    long_name :

    corner longitude of burst valid portion

    array([[[-156.01134018, -156.04946732],
            [-156.82786745, -156.86489625]],
    
           [[-156.01134018, -156.04946732],
            [-156.82786745, -156.86489625]]])

  • burst_corner_latitude
    (tile_line, c_sample, c_line)
    float64
    22.11 21.93 22.26 ... 22.26 22.08

    long_name :

    corner latitude of burst valid portion

    array([[[22.11142504, 21.93103525],
            [22.25812018, 22.07781594]],
    
           [[22.11142504, 21.93103525],
            [22.25812018, 22.07781594]]])

  • cwave_params
    (tile_line, tile_sample, k_gp, phi_hf)
    float64
    5.659 0.04606 ... 0.06416 0.03096

    long_name :

    CWAVE parameters (2tau)

    array([[[[ 5.65903425e+00,  4.60579244e-02, -3.82709720e+00,
              -1.58184965e-01,  2.15626234e+00],
             [ 4.19538385e-01,  2.94856735e-02, -2.28316873e+00,
               3.81239640e-02,  1.65104855e+00],
             [-1.91143168e-01, -6.80305031e-02, -5.30571257e-02,
               6.13457051e-02,  6.28686236e-01],
             [ 2.96847165e-03,  4.87977472e-03,  1.75304731e-01,
              -1.14090233e-02,  1.28461692e-02]],
    
            [[ 5.59825830e+00, -4.38973626e-02, -3.65727985e+00,
               5.50011601e-03,  1.93231741e+00],
             [ 4.84430206e-01,  6.99805367e-02, -2.26448479e+00,
              -7.32250265e-02,  1.66156445e+00],
             [-2.12429455e-01, -1.95497212e-02, -2.58167642e-01,
               3.99685299e-02,  7.17613629e-01],
             [ 1.08448549e-01, -3.68341451e-02,  2.25525893e-01,
               7.29209927e-03,  1.01037191e-01]],
    
            [[ 5.68608881e+00,  6.03220607e-02, -3.53263130e+00,
              -2.86828200e-01,  1.85286478e+00],
    ...
             [ 3.76508116e-02,  4.08413345e-02,  1.68841633e-01,
               6.25445102e-02,  1.49927612e-01]],
    
            [[ 5.62778275e+00, -5.63902952e-02, -3.45801201e+00,
              -2.21422442e-01,  1.96215493e+00],
             [ 3.90843681e-01,  1.03999622e-01, -2.37172875e+00,
               6.23044862e-02,  1.56282283e+00],
             [-1.13992657e-01, -4.71172118e-02, -2.47134346e-01,
              -3.50510219e-02,  8.22794143e-01],
             [ 6.15856564e-02,  1.28707908e-02,  2.17348024e-01,
               1.75753357e-02,  7.79042878e-02]],
    
            [[ 5.58447967e+00,  1.09184947e-01, -3.65392345e+00,
              -1.50031244e-01,  2.00274886e+00],
             [ 4.62093321e-01,  1.53766832e-02, -2.35436797e+00,
              -9.09072925e-02,  1.61632386e+00],
             [-1.08175508e-01,  1.00667666e-03, -1.61474236e-01,
               1.26591972e-02,  7.92097906e-01],
             [-2.64719265e-02, -1.92341883e-02,  1.64858102e-01,
               6.41561556e-02,  3.09617270e-02]]]])

  • macs
    (tile_line, tile_sample, lambda_range_max_macs)
    complex128
    (0.6682525912716829-0.0426492528...

    kaz_min :

    -0.010471975511965976

    kaz_max :

    0.010471975511965976

    krg_max :

    0.41887902047863906

    long_name :

    Mean rAnge Cross-Spectrum (2tau)

    array([[[0.66825259-0.04264925j, 1.58267638-0.26273887j,
             2.11330865-0.15376312j, 2.88595575-0.03668561j,
             4.06381207+0.02221972j, 4.48561566-0.03138937j,
             4.53187565-0.08523958j, 4.51846306-0.07135042j,
             4.55747593-0.06582876j, 4.56477024-0.06967394j,
             4.54114402-0.09522774j],
            [0.66762941+0.09148228j, 1.34855162+0.00797395j,
             1.67846019+0.01540913j, 2.13031337-0.02399098j,
             2.79731295+0.002728j  , 3.04461151+0.13706137j,
             3.10717187+0.16349182j, 3.15319909+0.12254941j,
             3.14756436+0.12641224j, 3.18285918+0.12837087j,
             3.16783063+0.1456087j ],
            [0.24089382-0.06292596j, 1.09557626+0.10863032j,
             1.63922727+0.02197447j, 2.12936019-0.02028364j,
             2.64890987+0.05766394j, 2.92728652+0.04011859j,
             2.97177509-0.00171708j, 2.98990051-0.00129467j,
             2.99561086-0.01307509j, 3.00780298-0.02702993j,
             3.01002154-0.05260036j],
            [0.32460585-0.04159154j, 1.1422633 -0.04831622j,
             1.69364792+0.28203518j, 2.21467763+0.32851676j,
    ...
             2.81698918+0.24384493j, 2.83594535+0.26851006j,
             2.82922005+0.27074207j],
            [0.18231311+0.16657331j, 0.67251732+0.44240123j,
             1.19009221+0.55679025j, 1.72929843+0.59435108j,
             2.26843675+0.66850658j, 2.47460574+0.69839205j,
             2.54308852+0.77344012j, 2.55179469+0.78537888j,
             2.56150273+0.78092058j, 2.55558166+0.83131738j,
             2.59515308+0.85750361j],
            [0.46040084+0.26062871j, 0.88199791+0.25811758j,
             1.28420434+0.3519036j , 1.73295577+0.41911887j,
             2.14096573+0.48139146j, 2.30919008+0.48441218j,
             2.30072991+0.45910225j, 2.27895794+0.50656431j,
             2.31704529+0.46260577j, 2.32569611+0.51489706j,
             2.32621939+0.50587734j],
            [0.09012298-0.18929119j, 0.3787251 -0.01755084j,
             0.9053514 +0.03482744j, 1.42834118+0.09159635j,
             1.8898014 +0.16953753j, 2.19596919+0.25436482j,
             2.2091035 +0.24117249j, 2.22210684+0.25303273j,
             2.25662924+0.23821379j, 2.26502423+0.2466299j ,
             2.26367763+0.26662956j]]])

  • azimuth_cutoff
    (tile_line, tile_sample)
    float64
    251.7 247.3 236.1 ... 223.4 242.5

    long_name :

    Azimuthal cut-off (2tau)

    units :

    m

    array([[251.69483179, 247.26691044, 236.07411957, 252.05995938,
            283.54268054, 253.28145866],
           [245.98213255, 237.82006979, 240.86617466, 222.72869673,
            223.43407567, 242.49179254]])

  • azimuth_cutoff_error
    (tile_line, tile_sample)
    float64
    0.05023 0.07115 ... 0.1083 0.1544

    long_name :

    normalized azimuthal cut-off error std (2tau)

    array([[0.05022604, 0.07114978, 0.09674553, 0.13193715, 0.08133808,
            0.07458162],
           [0.12381964, 0.08382542, 0.14783144, 0.08378288, 0.10827541,
            0.1543652 ]])

• Indexes: (4)
  • bt_thresh
    PandasIndex

    PandasIndex(Index([5, 50, 100, 150, 200], dtype='int64', name='bt_thresh'))

  • k_gp
    PandasIndex

    PandasIndex(Index([1, 2, 3, 4], dtype='int64', name='k_gp'))

  • phi_hf
    PandasIndex

    PandasIndex(Index([1, 2, 3, 4, 5], dtype='int64', name='phi_hf'))

  • lambda_range_max_macs
    PandasIndex

    PandasIndex(Index([25.0, 50.0, 75.0, 100.0, 125.0, 150.0, 175.0, 200.0, 225.0, 250.0,
           275.0],
          dtype='float64', name='lambda_range_max_macs'))

• Attributes: (24)

  name :

  SENTINEL1_DS:/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a/L1/IW/S1A_IW_SLC__1S/2022/127/S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  short_name :

  SENTINEL1_DS:S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE:IW1

  product :

  SLC

  safe :

  S1A_IW_SLC__1SDV_20220507T162411_20220507T162439_043107_0525DE_734D.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  3.51

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2022-05-07 16:24:11.657511

  stop_date :

  2022-05-07 16:24:39.551410

  footprint :

  POLYGON ((-156.007554522451 22.11305598776757, -156.828566570621 22.26055884746177, -157.1735700846729 20.57642729405949, -156.362421774522 20.42809155051743, -156.007554522451 22.11305598776757))

  coverage :

  190km * 86km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -167.7204378813183

  comment :

  denoised digital number, read at full resolution

  history :

  digital_number: measurement/s1a-iw1-slc-v*-20220507t162411-20220507t162439-043107-0525de-00*.tiff

  azimuth_steering_rate :

  1.590368784

  radar_frequency :

  5405000454.33435

  azimuth_time_interval :

  0.002055556299999998

  required_tile_width_sample :

  5000.0

  required_tile_width_line :

  5000.0

  required_tile_overlap_sample :

  -10000.0

  required_tile_overlap_line :

  -10000.0

tile_line_i = 0
tile_sample_i = 0
onespec_without_IR = intra_xs_without_IR['xspectra_2tau'].isel({'tile_sample':tile_sample_i,'tile_line':tile_line_i}).squeeze()
onespec_without_IR = onespec_without_IR.swap_dims({'freq_line': 'k_az', 'freq_sample': 'k_rg'})
abs(onespec_without_IR.real.mean(dim='k_rg')).plot(label='real without IR')

onespec_with_IR = intra_xs_with_IR['xspectra_2tau'].isel({'tile_sample':tile_sample_i,'tile_line':tile_line_i}).squeeze()
onespec_with_IR = onespec_with_IR.swap_dims({'freq_line': 'k_az', 'freq_sample': 'k_rg'})
abs(onespec_with_IR.real.mean(dim='k_rg')).plot(label='real with IR')
plt.legend()
plt.grid(True)
plt.show()

onespec_without_IR.imag.mean(dim='k_rg').plot(label='imag. without IR')
onespec_with_IR.imag.mean(dim='k_rg').plot(label='imag. with IR')
plt.legend()
plt.grid(True)
plt.show()