 |
||||||||
| Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
| EDG Data Set Name | Granule Shortname |
|---|---|
| MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid | MOD09GQK |
| Version | Acquisition Range | Science Quality Status |
|---|---|---|
| V003 | August 29, 2002 (2002241) - October 7, 2002 (2002280) | Provisional as of Nov 1, 2000 |
| V004 | February 24, 2000 (2000055) | Validated Stage 1 as of January 1 2003 |
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 262 MB
Resolution = ~250 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 5
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/Terra Surface Reflectance Daily L2G Global 250m SIN Grid product, MOD09GQK, contains data for the two MODIS bands with native 250m spatial resolution (bands 1-2). The best observations during a 24-hour period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 250m Pointer Files (MODPTQKM). Quality information for the MOD09GQK product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file.
The MOD09GQK image shown is a false-color RGB combination using bands 2-1-1 (band 2: 841-876 nm, band 1: 620-670 nm). Vegetation appears red, water appears blue, and clouds appear white over Tile h11v05 covering the eastern United States. 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 validated, meaning that product uncertainties are well defined over a range of representa tive conditions. Although there may be later improved versions, these data are ready for use in scientific publications.
| SDS | Units | Data Type | Fill Value | Valid Range | Divide by Scale Factor |
|---|---|---|---|---|---|
| 250m Surface Reflectance Band 1 (620-670 nm) | Reflectance | 16-bit signed integer | -28672 | -100 - 16000 | 10000 |
| 250m Surface Reflectance Band 2 (841-876 nm) | Reflectance | 16-bit signed integer | -28672 | -100 - 16000 | 10000 |
| *250m Reflectance Band Quality | Bit field | 16-bit unsigned integer | 2995 | 0 - 65536 | na |
| Orbit and coverage | Bit field | 8-bit unsigned integer | 15 | 0 - 255 | na |
| Number of Observations | na | 8-bit signed integer | -1 | 0 - 127 | na |
*MODIS Surface Reflectance QA Science Data Sets
View a Version Formatted for Printing
Retrieve the MOD09GQKv4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MOD09GQK.4&group=MOLT
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLT/MOD09GQK.004/
Order These Data through the EOS Data Gateway
MODIS/TERRA SURFACE REFLECTANCE DAILY L2G GLOBAL 250M SIN GRID V004
EOS Data Gateway Search Tips
| Data Center: | LPDAAC |
|---|---|
| Sensor: | MODIS |
| Dataset: | MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid |
| Spatial: | HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: | Type Lat/Long Range or Draw on Map |
| Temporal Extent: | 2000-02-24 to present |
Product Information
Contact Information
|
LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 |
|
|---|---|
| Phone: | 605-594-6116 |
| Toll Free: | 866-573-3222 |
| 866-LPE-DAAC | |
| Fax: | 605-594-6963 |
| Email: | LPDAAC@eos.nasa.gov |
| Web: | http://LPDAAC.usgs.gov |
| LP DAAC | EROS Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
| This site is hosted by the USGS - NASA Distributed Active Archive Center U.S. Government: Public Information Exchange Resource NASA: Privacy Policy and Important Notices USGS: Privacy Statement, Disclaimer, Accessibility, FOIA DOI: Privacy Statement, Privacy Disclaimer, No FEAR Act, FOIA, Performance Plan, Children's Privacy URL: http://LPDAAC.usgs.gov/modis/mod09gqkv4.asp Technical Contact: LPDAAC@eos.nasa.gov Last Update: Tuesday, August 30, 2005 Download Adobe Acrobat Reader |
 |
