Example of Wind inversion

define a product GRD Sentinel-1

import xsar

# test on an dummy GRD IW product
input_file = xsar.get_test_file('S1A_IW_GRDH_1SDV_20170907T103020_20170907T103045_018268_01EB76_Z010.SAFE')

perform wind inversion

from grdwindinversion.inversion import makeL2

define config file

import grdwindinversion
import os
config_file_s1 = os.path.join(os.path.dirname(grdwindinversion.__file__),'config_S1.yaml')
grdwindinversion.__file__
print(os.path.exists(config_file_s1))

True

out_folder = '/tmp/test_windinversion'

makeL2?

out_file,outds = makeL2(input_file,out_folder, config_path=config_file_s1,overwrite=True)
outds

WARNING:xsar.base_dataset:Raster variable are experimental
INFO:xsarsea.windspeed:timing invert_from_model : 3.81s. mem: +123.5Mb
/opt/conda-envs/dev/lib/python3.10/site-packages/xsarsea/windspeed/windspeed.py:76: UserWarning: Unable to check sigma0 pol. Assuming  VH
  warnings.warn('Unable to check sigma0 pol. Assuming  %s' % model_pol)
INFO:xsarsea.windspeed:timing invert_from_model : 0.74s. mem: +4.0Mb
/home1/datahome/agrouaze/sources/git/grdwindinversion/grdwindinversion/inversion.py:417: UserWarning: rename 'line' to 'owiAzSize' does not create an index anymore. Try using swap_dims instead or use set_index after rename to create an indexed coordinate.
  dataset_1000m = dataset_1000m.rename(
/home1/datahome/agrouaze/sources/git/grdwindinversion/grdwindinversion/inversion.py:417: UserWarning: rename 'sample' to 'owiRaSize' does not create an index anymore. Try using swap_dims instead or use set_index after rename to create an indexed coordinate.
  dataset_1000m = dataset_1000m.rename(
/opt/conda-envs/dev/lib/python3.10/site-packages/pandas/core/internals/blocks.py:2540: RuntimeWarning: invalid value encountered in cast
  values = values.astype(str)

<xarray.Dataset>
Dimensions:                            (owiAzSize: 167, owiRaSize: 251)
Dimensions without coordinates: owiAzSize, owiRaSize
Data variables: (12/22)
    owiLon                             (owiAzSize, owiRaSize) float64 -67.85 ...
    owiLandFlag                        (owiAzSize, owiRaSize) bool False ... ...
    owiElevationAngle                  (owiAzSize, owiRaSize) float64 27.53 ....
    owiIncidenceAngle                  (owiAzSize, owiRaSize) float64 30.85 ....
    owiHeading                         (owiAzSize, owiRaSize) float32 -169.3 ...
    owiLat                             (owiAzSize, owiRaSize) float64 20.72 ....
    ...                                 ...
    owiWindSpeed                       (owiAzSize, owiRaSize) float64 22.4 .....
    owiWindSpeed_cross                 (owiAzSize, owiRaSize) float64 25.4 .....
    owiEcmwfWindSpeed                  (owiAzSize, owiRaSize) float64 24.22 ....
    owiEcmwfWindDirection              (owiAzSize, owiRaSize) float64 -0.1119...
    owiWindQuality                     (owiAzSize, owiRaSize) float64 0.0 ......
    owiWindFilter                      (owiAzSize, owiRaSize) float64 0.0 ......
Attributes: (12/43)
    short_name:            SENTINEL1_DS:S1A_IW_GRDH_1SDV_20170907T103020_2017...
    product:               GRDH
    safe:                  S1A_IW_GRDH_1SDV_20170907T103020_20170907T103045_0...
    swath:                 IW
    multidataset:          False
    ipf:                   2.84
    ...                    ...
    inversionTabGMF:       cmod5n, gmf_s1_v2
    wnf_3km_average:       /
    owiWindSpeedSrc:       owiWindSpeed
    owiWindDirectionSrc:   /
    xsar_version:          1.1.7.dev1+g7186725.d20230829
    xsarsea_version:       0.8

xarray.Dataset

• Dimensions:
  • owiAzSize: 167
  • owiRaSize: 251
• Coordinates: (0)
• Data variables: (22)
  • owiLon
    (owiAzSize, owiRaSize)
    float64
    -67.85 -67.86 ... -70.49 -70.5

    history :

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

    array([[-67.84781053, -67.85723231, -67.8666541 , ..., -70.19061585,
            -70.20008787, -70.20955988],
           [-67.84969976, -67.85912098, -67.8685422 , ..., -70.19236222,
            -70.20183365, -70.21130507],
           [-67.85158899, -67.86100965, -67.8704303 , ..., -70.19410859,
            -70.20357943, -70.21305027],
           ...,
           [-68.15682948, -68.16616225, -68.17549501, ..., -70.47706512,
            -70.48644419, -70.49582326],
           [-68.15870839, -68.16804064, -68.17737289, ..., -70.4788123 ,
            -70.48819083, -70.49756935],
           [-68.1605873 , -68.16991903, -68.17925076, ..., -70.48055948,
            -70.48993746, -70.49931545]])

  • owiLandFlag
    (owiAzSize, owiRaSize)
    bool
    False False False ... True True

    history :

    land_mask: cartopy.feature.NaturalEarthFeature land

    meaning :

    0: ocean , 1: land

    long_name :

    Mask of data

    valid_range :

    [0 3]

    flag_values :

    [0 1 2 3]

    flag_meanings :

    valid land ice no_valid

    array([[False, False, False, ..., False, False, False],
           [False, False, False, ..., False, False, False],
           [False, False, False, ..., False, False, False],
           ...,
           [False, False, False, ...,  True,  True,  True],
           [False, False, False, ...,  True,  True,  True],
           [False, False, False, ...,  True,  True,  True]])

  • owiElevationAngle
    (owiAzSize, owiRaSize)
    float64
    27.53 27.59 27.65 ... 40.32 40.36

    history :

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

    array([[27.5289327 , 27.58995935, 27.65098601, ..., 40.26187715,
            40.30391167, 40.34594619],
           [27.52902303, 27.59004962, 27.65107621, ..., 40.26195071,
            40.30398516, 40.34601961],
           [27.52911335, 27.59013989, 27.65116642, ..., 40.26202426,
            40.30405865, 40.34609303],
           ...,
           [27.54248713, 27.603505  , 27.66452287, ..., 40.27294743,
            40.31497173, 40.35699604],
           [27.54256089, 27.60357873, 27.66459658, ..., 40.27300807,
            40.31503232, 40.35705657],
           [27.54263465, 27.60365247, 27.66467029, ..., 40.27306871,
            40.31509291, 40.3571171 ]])

  • owiIncidenceAngle
    (owiAzSize, owiRaSize)
    float64
    30.85 30.92 30.99 ... 45.88 45.93

    history :

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

    array([[30.85114058, 30.92115411, 30.99116765, ..., 45.81285173,
            45.86387329, 45.91489485],
           [30.85123981, 30.92125329, 30.99126677, ..., 45.81293343,
            45.86395491, 45.9149764 ],
           [30.85133905, 30.92135247, 30.99136588, ..., 45.81301512,
            45.86403653, 45.91505794],
           ...,
           [30.86602137, 30.93602563, 31.0060299 , ..., 45.82512492,
            45.87613577, 45.92714661],
           [30.86610226, 30.9361065 , 31.00611074, ..., 45.825192  ,
            45.87620278, 45.92721357],
           [30.86618315, 30.93618736, 31.00619158, ..., 45.82525908,
            45.8762698 , 45.92728053]])

  • owiHeading
    (owiAzSize, owiRaSize)
    float32
    -169.3 -169.3 ... -169.2 -169.2

    comment :

    at ground level, computed from lon/lat in azimuth direction

    long_name :

    Platform heading (azimuth from North)

    units :

    Degrees

    array([[-169.31232, -169.31242, -169.31255, ..., -169.34135, -169.34148,
            -169.3416 ],
           [-169.31169, -169.31181, -169.31192, ..., -169.34073, -169.34085,
            -169.34096],
           [-169.31108, -169.31119, -169.31131, ..., -169.34009, -169.34021,
            -169.34033],
           ...,
           [-169.21411, -169.21422, -169.21432, ..., -169.24118, -169.24129,
            -169.2414 ],
           [-169.21353, -169.21364, -169.21375, ..., -169.24059, -169.24069,
            -169.2408 ],
           [-169.21295, -169.21306, -169.21317, ..., -169.23999, -169.24011,
            -169.24022]], dtype=float32)

  • owiLat
    (owiAzSize, owiRaSize)
    float64
    20.72 20.72 20.73 ... 19.65 19.65

    history :

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

    array([[20.72204692, 20.7237845 , 20.72552209, ..., 21.13771109,
            21.13932363, 21.14093617],
           [20.71304489, 20.71478252, 20.71652015, ..., 21.1287281 ,
            21.13034075, 21.1319534 ],
           [20.70404286, 20.70578054, 20.70751822, ..., 21.11974512,
            21.12135788, 21.12297063],
           ...,
           [19.24554618, 19.24729183, 19.24903748, ..., 19.66437939,
            19.66600956, 19.66763973],
           [19.23654197, 19.23828767, 19.24003337, ..., 19.6553948 ,
            19.65702508, 19.65865536],
           [19.22753776, 19.22928351, 19.23102926, ..., 19.64641021,
            19.6480406 , 19.64967099]])

  • owiMask
    (owiAzSize, owiRaSize)
    bool
    False False False ... True True

    array([[False, False, False, ..., False, False, False],
           [False, False, False, ..., False, False, False],
           [False, False, False, ..., False, False, False],
           ...,
           [False, False, False, ...,  True,  True,  True],
           [False, False, False, ...,  True,  True,  True],
           [False, False, False, ...,  True,  True,  True]])

  • owiNrcs
    (owiAzSize, owiRaSize)
    float64
    0.2158 0.2688 0.2601 ... nan nan

    units :

    m^2 / m^2

    long_name :

    Normalized Radar Cross Section

    array([[0.21581085, 0.26883339, 0.26007095, ..., 0.02557092, 0.02603576,
            0.01852182],
           [0.21581085, 0.28000034, 0.26007095, ..., 0.02740042, 0.02915147,
            0.02012419],
           [0.22438987, 0.28648217, 0.27745314, ..., 0.02740042, 0.02851555,
            0.02012419],
           ...,
           [0.15072936, 0.17714953, 0.16619592, ...,        nan,        nan,
                   nan],
           [0.15311394, 0.17077528, 0.16370981, ...,        nan,        nan,
                   nan],
           [0.13794077, 0.1475968 , 0.14448138, ...,        nan,        nan,
                   nan]])

  • owiNesz
    (owiAzSize, owiRaSize)
    float64
    0.00369 0.003589 ... 0.003187

    array([[0.00368961, 0.00358862, 0.00349658, ..., 0.00264116, 0.00280456,
            0.00298385],
           [0.00368961, 0.00358862, 0.00349658, ..., 0.00264116, 0.00280456,
            0.00298385],
           [0.00368961, 0.00358862, 0.00349658, ..., 0.00264116, 0.00280456,
            0.00298385],
           ...,
           [0.00367471, 0.00357481, 0.00348395, ..., 0.00281192, 0.00299089,
            0.00318719],
           [0.00367471, 0.00357481, 0.00348395, ..., 0.00281192, 0.00299089,
            0.00318719],
           [0.00367471, 0.00357481, 0.00348395, ..., 0.00281192, 0.00299089,
            0.00318719]])

  • owiNrcs_no_noise_correction
    (owiAzSize, owiRaSize)
    float64
    0.2121 0.2652 0.2566 ... nan nan

    units :

    m^2 / m^2

    long_name :

    Normalized Radar Cross Section, no noise correction applied

    comment :

    owiNrcs - owiNesz

    var_definition :

    owiNrcs - owiNesz

    array([[0.21212124, 0.26524477, 0.25657437, ..., 0.02292976, 0.0232312 ,
            0.01553797],
           [0.21212124, 0.27641172, 0.25657437, ..., 0.02475926, 0.02634691,
            0.01714034],
           [0.22070026, 0.28289355, 0.27395655, ..., 0.02475926, 0.02571098,
            0.01714034],
           ...,
           [0.14705465, 0.17357472, 0.16271198, ...,        nan,        nan,
                   nan],
           [0.14943923, 0.16720047, 0.16022586, ...,        nan,        nan,
                   nan],
           [0.13426606, 0.144022  , 0.14099743, ...,        nan,        nan,
                   nan]])

  • owiNrcs_cross
    (owiAzSize, owiRaSize)
    float64
    0.004874 0.007096 ... nan nan

    units :

    m^2 / m^2

    long_name :

    Normalized Radar Cross Section

    array([[0.00487429, 0.00709584, 0.00689999, ..., 0.00224338, 0.0025977 ,
            0.00119407],
           [0.0051598 , 0.0077367 , 0.00753299, ..., 0.00275424, 0.00286293,
            0.00142755],
           [0.00544988, 0.008064  , 0.00785636, ..., 0.00275424, 0.00313456,
            0.00142755],
           ...,
           [0.00575942, 0.00679617, 0.00629803, ...,        nan,        nan,
                   nan],
           [0.00575942, 0.00648719, 0.00660306, ...,        nan,        nan,
                   nan],
           [0.00488919, 0.0055877 , 0.00599758, ...,        nan,        nan,
                   nan]])

  • owiNesz_cross
    (owiAzSize, owiRaSize)
    float64
    0.003906 0.003801 ... 0.003146

    array([[0.00390573, 0.00380104, 0.003705  , ..., 0.00261296, 0.00277411,
            0.00295098],
           [0.00390573, 0.00380104, 0.003705  , ..., 0.00261296, 0.00277411,
            0.00295098],
           [0.00390573, 0.00380104, 0.003705  , ..., 0.00261296, 0.00277411,
            0.00295098],
           ...,
           [0.00389083, 0.00378714, 0.00369231, ..., 0.00277662, 0.00295287,
            0.00314643],
           [0.00389083, 0.00378714, 0.00369231, ..., 0.00277662, 0.00295287,
            0.00314643],
           [0.00389083, 0.00378714, 0.00369231, ..., 0.00277662, 0.00295287,
            0.00314643]])

  • owiNrcs_cross_no_noise_correction
    (owiAzSize, owiRaSize)
    float64
    0.0009686 0.003295 ... nan nan

    units :

    m^2 / m^2

    long_name :

    Normalized Radar Cross Section, no noise correction applied

    array([[ 9.68560874e-04,  3.29480848e-03,  3.19498505e-03, ...,
            -3.69575862e-04, -1.76411189e-04, -1.75691470e-03],
           [ 1.25407136e-03,  3.93566681e-03,  3.82798198e-03, ...,
             1.41281169e-04,  8.88238847e-05, -1.52343557e-03],
           [ 1.54415002e-03,  4.26296230e-03,  4.15136085e-03, ...,
             1.41281169e-04,  3.60450165e-04, -1.52343557e-03],
           ...,
           [ 1.86858808e-03,  3.00902841e-03,  2.60571406e-03, ...,
                        nan,             nan,             nan],
           [ 1.86858808e-03,  2.70004315e-03,  2.91074519e-03, ...,
                        nan,             nan,             nan],
           [ 9.98352109e-04,  1.80055272e-03,  2.30526987e-03, ...,
                        nan,             nan,             nan]])

  • owiNesz_cross_final
    (owiAzSize, owiRaSize)
    float64
    0.002804 0.002789 ... 0.0008505

    comment :

    nesz has been flattened using windspeed.nesz_flattening

    array([[0.00280449, 0.00278879, 0.00277319, ..., 0.00084541, 0.00084196,
            0.00083853],
           [0.00280449, 0.00278879, 0.00277319, ..., 0.00084541, 0.00084196,
            0.00083853],
           [0.00280449, 0.00278879, 0.00277319, ..., 0.00084541, 0.00084196,
            0.00083853],
           ...,
           [0.00277556, 0.00276034, 0.00274521, ..., 0.00085734, 0.00085391,
            0.0008505 ],
           [0.00277556, 0.00276034, 0.00274521, ..., 0.00085734, 0.00085391,
            0.0008505 ],
           [0.00277556, 0.00276034, 0.00274521, ..., 0.00085734, 0.00085391,
            0.0008505 ]])

  • owiDsig_cross
    (owiAzSize, owiRaSize)
    float64
    0.4519 0.2613 0.2698 ... nan nan

    comment :

    variable used to ponderate copol and crosspol

    array([[0.45189126, 0.26131115, 0.26984677, ..., 0.24596248, 0.1980557 ,
            0.60168964],
           [0.41639813, 0.23077821, 0.23786949, ..., 0.18315432, 0.17222867,
            0.46548105],
           [0.38492315, 0.21743834, 0.22392684, ..., 0.18315432, 0.15119239,
            0.46548105],
           ...,
           [0.35028774, 0.27395932, 0.30321957, ...,        nan,        nan,
                   nan],
           [0.35028774, 0.2929042 , 0.28329527, ...,        nan,        nan,
                   nan],
           [0.44325907, 0.3629772 , 0.32528446, ...,        nan,        nan,
                   nan]])

  • owiWindSpeed_co
    (owiAzSize, owiRaSize)
    float64
    15.4 19.0 18.4 17.8 ... nan nan nan

    comment :

    wind speed inverted from model gmf_cmod5n (VV)

    model :

    gmf_cmod5n

    units :

    m/s

    array([[15.4, 19. , 18.4, ..., 14. , 14.4, 12.6],
           [15.4, 19.6, 18.4, ..., 14.8, 15.2, 13.4],
           [16. , 20.2, 19.6, ..., 14.8, 15. , 13.4],
           ...,
           [18.8, 20.6, 20.2, ...,  nan,  nan,  nan],
           [19. , 20.6, 20. , ...,  nan,  nan,  nan],
           [17.8, 18.6, 18.6, ...,  nan,  nan,  nan]])

  • owiWindSpeed
    (owiAzSize, owiRaSize)
    float64
    22.4 28.8 28.4 27.8 ... nan nan nan

    comment :

    wind speed inverted from model gmf_cmod5n (VV) and gmf_s1_v2 (VH)

    model :

    gmf_cmod5n gmf_s1_v2

    units :

    m/s

    array([[22.4, 28.8, 28.4, ..., 19.2, 21. , 13.8],
           [23.2, 30.6, 29.8, ..., 21.6, 22.2, 15.2],
           [24. , 31.4, 30.8, ..., 21.6, 23.4, 15.2],
           ...,
           [25.6, 28.6, 27.2, ...,  nan,  nan,  nan],
           [25.6, 27.8, 28. , ...,  nan,  nan,  nan],
           [23. , 25.2, 26.2, ...,  nan,  nan,  nan]])

  • owiWindSpeed_cross
    (owiAzSize, owiRaSize)
    float64
    25.4 31.4 30.8 30.4 ... nan nan nan

    comment :

    wind speed inverted from model gmf_s1_v2 (VH)

    model :

    gmf_s1_v2

    units :

    m/s

    array([[25.4, 31.4, 30.8, ..., 19.6, 21.4, 14.2],
           [26.2, 33. , 32.4, ..., 22.2, 22.6, 15.4],
           [27. , 33.8, 33.2, ..., 22.2, 23.8, 15.4],
           ...,
           [27.8, 30.6, 29.4, ...,  nan,  nan,  nan],
           [27.8, 29.8, 30.2, ...,  nan,  nan,  nan],
           [25.4, 27.4, 28.6, ...,  nan,  nan,  nan]])

  • owiEcmwfWindSpeed
    (owiAzSize, owiRaSize)
    float64
    24.22 24.25 24.28 ... nan nan nan

    array([[24.21714992, 24.25082603, 24.28359573, ..., 15.1797663 ,
            15.06542089, 14.95694481],
           [24.27888572, 24.31319464, 24.34673879, ..., 15.1485803 ,
            15.04054103, 14.93888071],
           [24.34021394, 24.37496963, 24.40883953, ..., 15.12078649,
            15.01827149, 14.92354571],
           ...,
           [19.75770766, 19.83094488, 19.90408598, ...,         nan,
                    nan,         nan],
           [19.56888781, 19.63954043, 19.71038285, ...,         nan,
                    nan,         nan],
           [19.38241044, 19.45055445, 19.51908184, ...,         nan,
                    nan,         nan]])

  • owiEcmwfWindDirection
    (owiAzSize, owiRaSize)
    float64
    -0.1119 -0.105 -0.09831 ... nan nan

    comment :

    angle in radians, anticlockwise, 0=sample

    array([[-0.11190594, -0.10501477, -0.09831019, ...,  1.04864252,
             1.05552074,  1.06204568],
           [-0.11423711, -0.10767028, -0.1012216 , ...,  1.05660881,
             1.06335953,  1.06969585],
           [-0.11734282, -0.11111617, -0.10498155, ...,  1.0648249 ,
             1.07150089,  1.07763754],
           ...,
           [-1.90249762, -1.91120416, -1.91916299, ...,         nan,
                    nan,         nan],
           [-1.90501509, -1.91437041, -1.92304608, ...,         nan,
                    nan,         nan],
           [-1.90702514, -1.91702114, -1.92635954, ...,         nan,
                    nan,         nan]])

  • owiWindQuality
    (owiAzSize, owiRaSize)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    units :

    m^2 / m^2

    long_name :

    Quality flag taking into account the consistency_between_wind_inverted_and_NRCS_and_Doppler_measured

    valid_range :

    [0 3]

    flag_values :

    [0 1 2 3]

    flag_meanings :

    good medium low poor

    comment :

    not done yet

    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.]])

  • owiWindFilter
    (owiAzSize, owiRaSize)
    float64
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    units :

    m^2 / m^2

    long_name :

    Quality flag taking into account the local heterogeneity

    valid_range :

    [0 3]

    flag_values :

    [0 1 2 3]

    flag_meanings :

    homogeneous_NRCS, heterogeneous_from_co-polarization_NRCS, heterogeneous_from_cross-polarization_NRCS, heterogeneous_from_dual-polarization_NRCS

    comment :

    not done yet

    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.]])

• Indexes: (0)
• Attributes: (43)

  short_name :

  SENTINEL1_DS:S1A_IW_GRDH_1SDV_20170907T103020_20170907T103045_018268_01EB76_Z010.SAFE:IW

  product :

  GRDH

  safe :

  S1A_IW_GRDH_1SDV_20170907T103020_20170907T103045_018268_01EB76_Z010.SAFE

  swath :

  IW

  multidataset :

  False

  ipf :

  2.84

  platform :

  SENTINEL-1A

  pols :

  VV VH

  start_date :

  2017-09-07 10:30:20.936409

  stop_date :

  2017-09-07 10:30:45.935264

  footprint :

  POLYGON ((-67.84221143971432 20.72564283093837, -70.22162571215458 21.14758369556577, -70.51434171237564 19.64044158236074, -68.15836401927538 19.21519321274318, -67.84221143971432 20.72564283093837))

  coverage :

  170km * 251km (line * sample )

  orbit_pass :

  Descending

  platform_heading :

  -167.7668824808032

  L1_path :

  SENTINEL1_DS:/home1/scratch/agrouaze/xsardatasync/xsardata/S1A_IW_GRDH_1SDV_20170907T103020_20170907T103045_018268_01EB76_Z010.SAFE:IW

  ancillary_source :

  /home/datawork-cersat-intranet/project/ecmwf/0.125deg/1h/forecasts/2017/250/ecmwf_201709071100.nc

  TITLE :

  Sentinel-1 OWI Component

  productOwner :

  IFREMER

  sourceProduct :

  S1A

  missionName :

  SENTINEL-1 A

  missionPhase :

  Test

  polarisation :

  VV VH

  acquisitionStation :

  /

  softwareVersion :

  /

  pythonVersion :

  3.10

  polarisationRatio :

  /

  l2ProcessingUtcTime :

  2023-12-11T15:56:30Z

  processingCenter :

  /

  firstMeasurementTime :

  2017-09-07T10:30:20Z

  lastMeasurementTime :

  2017-09-07T10:30:45Z

  clmSource :

  /

  bathySource :

  /

  oswAlgorithmName :

  grdwindinversion

  owiAlgorithmVersion :

  0.1.6.dev19+gcc727da

  gmf :

  cmod5n, gmf_s1_v2

  iceSource :

  /

  owiNoiseCorrection :

  False

  inversionTabGMF :

  cmod5n, gmf_s1_v2

  wnf_3km_average :

  /

  owiWindSpeedSrc :

  owiWindSpeed

  owiWindDirectionSrc :

  /

  xsar_version :

  1.1.7.dev1+g7186725.d20230829

  xsarsea_version :

  0.8