Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (2400x2400 row/column)
Average File Size = 208 MB
Resolution = 500 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 10
MYD09GHK - Daily 500m Surface Reflectance acquired February 15, 2004 over the Red Sea.
Product Description
The MODerate-resolution Imaging Spectroradiometer (MODIS) Surface Reflectance products are computed from bands 1-7 to provide an estimate of the surface spectral reflectance for each band as it would be measured at ground level in the absence of atmospheric scattering or absorption. A correction scheme identifies atmospheric gases, aerosols, and thin cirrus clouds.
The MODIS/Aqua Surface Reflectance Daily L2G Global 500m SIN Grid product, MYD09GHK, contains data for each of the seven land bands, two at 250m resolution (bands 1-2), and five at 500m resolution (bands 3-7). The best observations during a 24-hour period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 500m Pointer Files (MYDPTHKM). Quality information for the MYD09GHK product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file.
The MYD09GHK image shown combines bands 1 (red), 4 (green) and 3 (blue) to display the Red Sea with data acquired February 15, 2004. A land/sea mask has been used to remove deep ocean water, which appears black in the image. Level-2G surface reflectance data are input for the generation of 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).
NOTE: These products are provisional, meaning that product quality may not be optimal. Incremental product improvements are still occurring, and users are urged to contact MODIS Science Team representatives prior to use of the data in publications. These data are likely to be replaced when the validated product becomes available.
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science Center (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001