Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 290 MB
Resolution = 250 meters
Projection = Sinusoidal
Processing Level = 2G
Data Format = HDF-EOS
Science Data Sets (SDSs) = 7
Color
Observation Coverage
Red
0 to 10%
Green
11 to 20%
Blue
21 to 30%
Yellow
31 to 40%
Cyan
41 to 50%
Magenta
51 to 60%
Maroon
61 to 70%
Purple
71 to 80%
Sienna
81 to 90%
Violet
91 to 100%
Color
Granule Pointers
Red
0
Yellow
1
Green
2
Black
255
Product Description
The MODIS Level 2 Gridded (L2G) land data storage methodology was developed to satisfy the diverse needs of the MODIS land product generation algorithms, to enable efficient processing and reprocessing of MODIS land products, to facilitate the development of terrestrial remote sensing algorithms and science using MODIS land data, and to provide users with the original sensed MODIS observations and their sub-pixel geolocation information.
The L2G data structure stores information concerning the Level 2 (L2) observations that fall within each Level 3 (L3) grid cell over a 24 hour (GMT) period. The observation coverage, the area of the intersection of the observation and each overlapping grid cell in the tile, is computed and stored. The above images represent day-mode L2G information acquired over the western coast of North America on June 9, 2000. The first image is of the observation coverage and the second contains the granule pointer, a pointer to the granule from which each observation was obtained. The original 250-m L2 product line and sample numbers of each observation are included. Offsets are provided to the corresponding observation in the coarser 500-m L2G files (MODPTHKM, etc.) to allow 250-m products to be generated using information from the coarser resolutions. The observations stored in the L2G products are examined by the L3 processes to extract the most relevant observations falling over each grid cell.
NOTE: The later versions of 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.
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science Center (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001