Abstract:
The MODIS Surface Reflectance products are 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 level-2 (L2G) and level-3 products.
...
MOD09A1 provides Bands 1-7 at 500-meter resolution in an 8-day gridded level-3
product in the Sinusoidal projection. Each MOD09A1 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. Science Data Sets provided for this product
include reflectance values for Bands 1-7, quality assessment, and the day of
the year for the pixel along with solar, view, and zenith angles.
Data Set Characteristics:
Area: ~10 degrees x 10 degrees lat/long
Image Dimensions: 2400 x 2400 rows/columns
File Size: ~64 MB compressed
Resolution: 500 meters
Projection: Sinusoidal
Data Format: HDF-EOS
Science Data Sets (SDS HDF Layers): 13
Version-5 MODIS/Aqua Surface Reflectance products are validated, meaning that
product uncertainties are well defined over a range of representative
conditions. Although there may be later improved versions, these data are
ready for use in scientific publications. 
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