ATCOR
Atmospheric/topographic correction is the elimination of atmospheric and illumination effects to retrieve physical parameters of the earth's surface, i.e. surface spectral reflectance, emissivity and temperature. The ATCOR products solve this task using look up tables calculated with the Modtran® 5 radiative transfer code. The ATCOR models has been split into separate codes optimized for satellite sensors and airborne sensors:
- The satellite ATCOR (ATCOR-2/3) supports only small to moderate FOV sensors and consists of separate codes for flat and rugged terrain. It includes a large database of atmospheric correction functions (look-up-tables computed with the Modtran® 5 radiative transfer code) covering a wide range of weather conditions, sun angles, and ground elevations.
- The airborne ATCOR (ATCOR-4) corrects small and wide FOV airborne optical and thermal scanner data. It interpolates the solution from an extensive Modtran®-derived atmospheric database for typical flight altitudes and solar geometries.