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23.3.2017 : 13:23 : +0100

GAMMA SAR Geocoding and Image Registration Software

The GAMMA SAR Geocoding and Image Registration Software (GEO) is a collection of tools for SAR geocoding and multi-source image registration. Geocoding is the coordinate transformation between the coordinates of an imaging system, in our case the range-Doppler coordinate of the SAR, and orthonormal map coordinates. Geocoding is necessary to combine information retreived by the SAR system with information in map coordinates (e.g. a topographic map, a landuse inventory, a geocoded optical data set). GAMMA's concept for the automation of the SAR geocoding includes advanced cross-correlation algorithms for precise image registration between the SAR image and a reference image in map geometry which can be a SAR image simulated from a Digital Elevation Model (DEM) or a geocoded optical image. Functionality includes:

  • generate multi-look intensity image (MLI) in slant range geometry
  • co-register multiple images in slant range geometry
  • SAR geocode without refinement: slant range and ground range to map geometry, with DEM (terrain corrected) / slant range and ground range to map geometry, without DEM (ellipsoid corrected)
  • SAR geocode with refinement: slant range and ground range to map geometry, with DEM (terrain corrected) / slant range and ground range to map geometry, without DEM (ellipsoid corrected)
  • co-register multiple images in map geometry (different SAR systems, different track geometries, different incidence angles, SAR-optical imagery)
  • additional functionality like mosaicing, data type conversions, use of precision orbits, radiometric calibration
  • display and rasterfile generation tools

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