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This is an NDVI image created by using two MODIS 250-meter reflectance data acquired March 28, 2007 over Mexico. (h08v06).
The MODIS Surface Reflectance products provide 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.
MOD09GQ provides Bands 1 and 2 at a 250-meter resolution in a daily gridded L2G product in the Sinusoidal projection. Science Data Sets provided for this product include reflectance for Bands 1 and 2, a quality rating, observation coverage, and observation number. This product is meant to be used in conjunction with the MOD09GA, where important quality and viewing geometry information is stored.
Version-5 MODIS/Terra Surface Reflectance products are Validated Stage 2, meaning that accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts.
See Product Description
Science Data Sets for MODIS Terra Surface Reflectance Daily L2G Global 250m SIN Grid V005 (MOD09GQ):
Science Data Sets (HDF Layers) (5)
MULTIPLY BY SCALE FACTOR
|num_observations: number of observations within the pixel||None||8-bit signed integer||-1||0–127||na|
|250m Surface Reflectance Band 1 (620-670 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|250m Surface Reflectance Band 2 (841-876 nm)||Reflectance||16-bit signed integer||-28672||-100–16000||0.0001|
|250m Reflectance Band Quality||Bit Field||16-bit unsigned integer||2995||0–4096||na|
|obs_cov: percentage of the grid cell area is covered by the observation||Percent||8-bit signed integer||-1||0–100||
The QA information below is excerpted from an HDF-EOS file of the MODIS Surface Reflectance product MOD09GQ.
Table 1: MOD09GQ.005 250-meter Surface Reflectance Data QA Descriptions (16-bit)
|0–1||MODLAND QA bits||00||corrected product produced at ideal quality all bands|
|01||corrected product produced at less than ideal quality some or all bands|
|10||corrected product not produced due to cloud effects all bands|
|11||corrected product not produced due to other reasons some or all bands may be fill value [Note that a value of (11) overrides a value of (01)].|
|11||not set; assumed clear|
|4–7||band 1 data quality four bit range||0000||highest quality|
|1000||dead detector; data interpolated in L1B|
|1001||solar zenith >= 86 degrees|
|1010||solar zenith >= 85 and < 86 degrees|
|1100||internal constant used in place of climatological data for at least one atmospheric constant|
|1101||correction out of bounds, pixel constrained to extreme allowable value|
|1110||L1B data faulty|
|1111||not processed due to deep ocean or clouds|
|8–11||band 2 data quality four bit range||SAME AS BAND ABOVE|
|12||atmospheric correction performed||1||yes|
|13||adjacency correction performed||1||yes|
|Temporal Coverage||February 24, 2000 -|
|Area||~10 x 10 lat/long|
|File Size||280 MB compressed|
|Dimensions||4800 x 4800 rows/columns|
|Science Data Sets (SDS HDF Layers)||5|
Please find the current MODIS-related Data policies on the MODIS Policies page at https://lpdaac.usgs.gov/products/modis_policies.
For information on how to cite LP DAAC data, please see our Data Citations page at https://lpdaac.usgs.gov/about/citing_lp_daac_and_data.
Data Pool: The Data Pool (On-line Archive) provides access to all MODIS products, and a rolling archive of ASTER level-1B products that cover the U.S. and its Territories.
Reverb: This tool provides access to a complete data record of all MODIS and ASTER products available from the LP DAAC.
GloVis: The Global Visualization interface provides access to tiled MODIS products that have an associated browse image, and all ASTER level-1B products.
MRTWeb: The MODIS Reprojection Tool Web interface provides access to all MRT services offered by the stand-alone MRT.
The Data Access section of this Web site also provides access to these interfaces.
LP DAAC User Services
U.S. Geological Survey (USGS)
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