**xsarslc**: SAR processor for ocean Level-1 SLC -> Level-1B XSP
2023.11.17.post1

Getting Started

  • Installation
    • conda install
    • Update xsar_slc to the latest version

Algorithm description

  • Algorithm Level-1 SLC to Level-1B XSP cross spectrum Sentinel-1
    • Processors steps overview
    • Deramping of digital numbers
    • uniform ground tiling for Sentinel-1 SLC burst
      • Burst division into constant ground segment (tiles)
      • Centering tiles
    • Computation of calibrated denoised sigma0
      • Calibration
      • Denoising
    • Compute land mask
    • Bright-Target mask computation
    • Complex modulation signal
      • Computation of the sigma0 normalized variance
    • Divide tiles into sub-tiles
    • Computation of azimuthal Doppler centroid
    • Computation of centered and normalized Doppler spectrum
      • Centering the Doppler spectrum
    • Normalization of the Doppler spectrum by the Impulse Response of the instrument
    • Computation of look cross-spectra (WV and IW products)
      • Extraction of azimuthal looks
      • Looks cross-spectra
    • Azimuthal cutoff computation
    • Computation of CWAVE parameters
    • Computation of MACS parameters

Level-1B product description

  • Level-1B SAR Ifremer Product Description
    • Product philosophy
    • Product structure
    • Product variables
      • Exhaustive content
        • Sentinel-1 Level-1B IFREMER variables explanation
      • Explanation on specific variables
    • Product attributes
    • Product access
    • Acknowledgment

Examples

  • SAR Sentinel-1 cross spectrum computation from large image Interferometric Wide-swath SLC
    • get datatree with digital numbers and annotations from IW SLC product
    • cross spectrum in inter bursts parts of the IW product
  • cross spectrum in intra bursts parts of the IW product
  • Example to compute image cross spectrum between different looks within a WV Sentinel-1 SLC product
  • display digital numbers
  • compute the periodograms and the looks inside the periodograms to get a cross spectra
  • A notebook to illustrate how to compute and correct Impulse Response in IW SLC product
    • compute IW1 impulse response
    • save IR file to netCDF
    • display IW1 range impulse response for VV and VH
    • display IW1 azimuth impulse response for VV and VH
    • apply IR correction when computing a cross spectra
  • A notebook to illustrate how to compute and correct Impulse Response in WV SLC product
    • read a WV SLC over homogeneous region in the rain forest
    • write a netCDF AUX IR file
    • apply IR correction when computing cross spectra on a WV image
      • compute xspec without IR correction
      • compute xspec with IR corretion
    • compare with/without
    • display difference with / without IR correction
  • illustration of the default Impulse Response (IR) files from xsarslc
    • display IR in range dimension
    • display IR in azimuth dimension

Reference

  • API reference
    • processing
      • compute_subswath_xspectra()
      • compute_IW_subswath_intraburst_xspectra()
      • compute_IW_subswath_interburst_xspectra()
      • compute_modulation()
      • compute_azimuth_cutoff()
      • tile_burst_to_xspectra()
      • compute_intraburst_xspectrum()
      • compute_looks()
      • tile_bursts_overlap_to_xspectra()
      • compute_interburst_xspectrum()
      • burst_valid_indexes()
      • crop_IW_burst()
      • deramp_burst()
      • crop_WV()
      • compute_IWS_subswath_Impulse_Response()
      • compute_WV_Impulse_Response()

Bibliography

  • Bibliography
**xsarslc**: SAR processor for ocean Level-1 SLC -> Level-1B XSP
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