The MODIS Near Real Time (NRT) level-2G 1km surface reflectance data state QA product MOD09GST, is a restructured version
of its primary input, the state QA data in MOD09_L2. This product summarizes the quality of the MOD09 products, specifically
atmospheric and other correction states. The product contains quality assurance data pertaining to cloud and cloud shadow,
land and water designations, aerosols, and the data source of corrections performed on the file. The data set also contains
the number of observations for each pixel.
Overall NRT products match to operational with some expected minor differences from use of different ancillaries and ephemeris.
There aren't any data gaps or data artifacts. Information on comparison of C5 Operational and NRT Atmospheric Products is
posted at: http://lance.modaps.eosdis.nasa.gov/data_products/comparison.html. Information on comparison of C6 Operational
and NRT Atmospheric and Land Products is posted at: http://lance3.modaps.eosdis.nasa.gov/data_products/comparison_atmos.html