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The Land Surface Reflectance Science Computing Facility is responsible for producing the MODIS Surface Reflectance product (MOD09). MODIS Surface Reflectance is a seven-band product computed from the MODIS Level 1B land bands 1, 2, 3, 4, 5, 6, and 7. The product is an estimate of the surface spectral reflectance for each band as it would have been measured at ground level as if there were no atmospheric scattering or absorption. It corrects for the effects of atmospheric gases, aerosols, and thin cirrus clouds. The surface reflectance is inverted with the help of a radiative transfer model (http://modis-sr.ltdri.org/6S_code/index.html) using atmospheric inputs taken from NCEP (ozone, pressure) or directly derived the MODIS data (aerosol, water vapor).
The Surface Reflectance product is a major input utilized in the generation of several land products: Vegetation Indices, BRDF, Land Cover, Snow Cover, Thermal Anomalies, and LAI/FPAR.
For stage II validation, the accuracy of the surface reflectance has been evaluated for 4988 cases; the product performs well since approximately 90% of the data are within the theoretical errors bars (click on the figure for more information).
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