Greenland geoscience data

The ASTER Level 1 Precision Terrain Corrected Registered At-Sensor Radiance (AST_L1T) data are obtained from the USGS webpage https://earthexplorer.usgs.gov/ in the time period of 2000-2007. Scenes were also limited to summer and captured in daytime. Preprocessing of the Aster scenes encompasses atmospheric, radiometric and topographic corrections before masking non-outcrop pixels and generating the final mosaic. The calibrated radiance data is converted to apparent surface reflectance using a radiative transfer program, Atmospheric and Topographic Correction (ATCOR-3), in rugged terrain mode. The ATCOR rugged terrain mode utilizes a surface elevation model to adjust illumination levels. Calibration and adjusting the apparent surface reflectance values from the ATCOR-3 processing was not feasible due to lack of ground-based reflectance measurements.