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The MODIS Surface Reflectance products provide an estimate of the surface spectral reflectance as it would be measured at ground level in the absence of atmospheric scattering or absorption. Low-level data are corrected for atmospheric gases and aerosols, yielding a level-2 basis for several higher-order gridded products.
In the 8-day product, each surface reflectance pixel contains the best possible L2G observation during an 8-day period as selected on the basis of high observation coverage, low view angle, the absence of clouds or cloud shadow, and aerosol loading.

Product PI: Eric Vermote
PI-maintained product web page

See links below to the Product Description pages posted at the LP DAAC (product details, data access links, user guides and more....)