Cal/Val Release 4 (R4)

• Add dry troposphere and bistatic delay corrections;
• Add coverage check for ancillary inputs (DEM);
• Provide multiple updates to the OPERA RTC-S1 product metadata:
  • Remove /science/SENTINEL1 and /science/SENTINEL1/RTC base paths from RTC-S1 HDF5 metadata;
  • Rename HDF5 imagery group grids to data;
  • Add RFI fields.
  • Add layer name and description to GeoTIFF metadata;
  • Update metadata field orbitType.
• GeoTIFF files
  • Update default compression algorithm from ZSTD to DEFLATE;
  • Remove NBITS=16 from default runconfig
• Mosaicking
  • Update functions to compute burst and mosaic geogrids
  • Separate runconfig burst and mosaic geogrids
  • Add mosaicking with different output formats;
  • Add support to mosaicking with negative offsets;
  • Add handling of Byte and Integer images;
  • Save color table and no data values into the output mosaic (when available).
  • Provide three mosaicking options: average, first, and bursts_center
  • Reproject burst product before mosaicking if needed
• Layover/shadow mask
  • Add fill value and color table to the layover shadow mask;
  • Add option to dilate the layover/shadow mask;
• Add option to skip process if output geocoded files exist;
• Other minor updates:
• Minor updates:
  • Substitute metadata field ISCEVersion to isce3Version;
  • Update some comments, fix typos, indentation, and bugs;
  • Update dem_description to dem_file_description;
  • Separate runconfig burst and mosaic geogrids;
  • Remove requirement of save_nlooks = True;
  • Add test runconfig at tests/runconfigs/s1b_los_angeles.yaml and use it for workflow testing rather than using the runconfig downloaded from zenodo (during workflow test).