The SASR (Standard Atmosphere Surface Reflectance) product is a per-pixel, per-band estimate of the surface spectral reflectance (in W m-2
) as it would have been measured at ground level as if there were no atmospheric contribution. It first calibrates imagery to the at-sensor (or top-of-atmosphere or planetary) reflectances and then, assuming a standard atmosphere, corrects it for the atmospheric transmittance terms, atmospheric depth deviation from the sea level, sensor off-nadir view angles, solar off-zenith angles, and the curvature of the earth. The product is a raster image, linearly scaled between 0 (0% reflectance) to 10,000 (100% reflectance).
The SASR calibration improves radiometric properties of the imagery and allows for superior land cover and crop mapping, change analysis, as well as image mosaicing and comparison.
Currently Supported Sensors: P6-AWiFS, P6-LISS III, P6-LISS IV, Landsat 5 TM, Landsat 7 ETM+, Landsat 7 ETM+ SLC-off, Landsat 8 OLI, IKONOS-2, QuickBird-2, SPOT-2, SPOT-4, SPOT-5, DMC AISAT-1, DMC Beijing-1, DMC Deimos-1, DMC NigeriaSAT-1, DMC NigeriaSAT-2, DMC UK-1, DMC UK-2. Additional sensors may be available upon request.
- Standard Delivery Format: 16-bit integer uncompressed GeoTIFF format stored in .zip archives
- Pixel Resolution: The same pixel resolution as the original image
- Projection/ Reference System: The same projection and reference system as the original image