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Afghanistan
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Product Documentation
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High-resolution Satellite Image 2001 (Landsat)
http://landsat7.usgs.gov/ MODIS Surface Reflectance Products The MODIS surface reflectance product is a seven-band product computed from the MODIS Level 1B land bands 1, 2, 3, 4, 5, 6, and 7 (centered at 648 nm, 858 nm, 470 nm, 555 nm, 1240 nm, 1640 nm, and 2130 nm, respectively). The product is an estimate of the surface spectral reflectance for each band, as it would have been measured at ground level if there were no atmospheric scattering or absorption. The correction scheme includes corrections for the effect of atmospheric gases, aerosol, and thin cirrus clouds; it is applied to all non-cloudy MOD 35 Level 1B pixels that pass the Level 1B quality control. It uses input from: Bidirectional Reflectance Distribution Function (BRDF)/Albedo Product (MOD43), Atmospheric Profiles (MOD07) for ozone, Total Precipitable Water (MOD05) for water vapor, Aerosol Product (MOD04) for aerosols, and MODIS band 26 for cirrus clouds. The best available ancillary or climatology data are used if these MODIS-specific inputs are unavailable. The MOD09A1 image shown here is a sample of the Level 3, 8-day composite of 500 m Level 3 Surface Reflectance bands 1 (red), 4 (green) and 3 (blue). With this composition, snow appears white on the map. Product Description (http://modis-land.gsfc.nasa.gov/surfrad.htm) User Guide (http://modis-sr.ltdri.org/html/guide.htm) |
