Abstract:
The MODIS Surface Reflectance Daily L2G Global 500m ISIN Grid product, MOD09,
is a seven-band product computed from the MODIS Level 1B land bands 1-7. 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, aerosols, and thin cirrus clouds; it is applied to
all non-cloudy MOD35 Level-1B pixels that pass the Level-1B quality control.
The correction uses band 26 to detect cirrus clouds, MOD05 for water vapor,
MOD04 for aerosols, and MOD07 for ozone; the best available climatology data
are used if the MODIS water vapor, aerosol, or ozone products are unavailable.
The Level 2G surface reflectance product is the input for product generation
for several land products: 8-day Surface Reflectance, Vegetation Indices
(VIs), Bidirectional Reflectance Distribution Function (BRDF), thermal anomaly,
snow/ice, and Fraction of Photosynthetically Active Radiation/Leaf Area Index
(FPAR/LAI).
Data Set Characteristics
Area: ~10 degrees x 10 degrees lat/long
Image Dimensions: 2400 x 2400 rows/columns
File Size: 50-500 MB
Resolution: ~500 meters
Projection: Sinusoidal
Data Format: HDF-EOS
Science Data Sets (SDS HDF Layers): 10
Version-4 MODIS/Terra data are validated products. NOTE: These 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 still experimental in
nature upon their initial release. Investigations are underway to assess the
scientific validity of these products. 
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