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| EDG Data Set Name | Granule Shortname |
|---|---|
| MODIS/Aqua Surface Reflectance 8-Day L3 Global 250m SIN Grid | MYD09Q1 |
| Version | Acquisition Range | Science Quality Status |
|---|---|---|
| V003 | March 6 2003 (2003065) - February 1 2004 (2002032) | Provisional |
| V004 | July 4 2002 (2002185) | Validated Stage 1 as of July 4, 2002 |
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (4800x4800 row/column)
Average File Size = 138 MB
Resolution = 250 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 3
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 8-Day L3 Global 250m SIN Grid product, MYD09Q1, is a composite of the previous 8 daily L2G Surface Reflectance products (MYD09GQK). The best observations during an 8-day period, as determined by overall pixel quality and observational coverage, are matched geographically according to corresponding 250m Pointer Files (MYDPTQKM). Quality information for the MYD09Q1 product is provided at three different levels of detail: for individual pixels, for each band and each resolution, and for the whole file.
The MYD09Q1 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 h09v07 covering Yucatan, Honduras, and Nicaragua between February 2 - 9, 2004. A land/sea mask has been used to remove deep ocean water, which appears black in the image. Surface Reflectance data are generally used for land characterization research, and may be used to generate land-related products, or as input to global and regional climate models and surface energy balance models.
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.
| SDS | Units | Data Type-bit | Fill Value | Valid Range | Multiply by Scale Factor |
|---|---|---|---|---|---|
| Surface Reflectance for band 1 (620-670 nm) | reflectance | 16-bit signed integer | -28672 | -100 - 16000 | 0.0001 |
| Surface Reflectance for band 2 (841-876 nm) | reflectance | 16-bit signed integer | -28672 | -100 - 16000 | 0.0001 |
| *Surface reflectance 250m quality control flags | Bit field | 16-bit unsigned integer | 65535 | 0-4294966531 | na |
*MODIS Surface Reflectance QA Science Data Sets
View a Version Formatted for Printing
Retrieve the MYD09Q1v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MYD09Q1.4&group=MOLA
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLA/MYD09Q1.004/
Order These Data through the EOS Data Gateway
MODIS/AQUA SURFACE REFLECTANCE 8-DAY L3 GLOBAL 250M SIN GRID V004
| Source: | Aqua |
|---|---|
| Sensor: | MODIS |
| Dataset: | MODIS/Aqua Surface Reflectance 8-Day L3 Global 250m SIN Grid |
| Spatial: | HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: | Type Lat/Long Range or Draw on Map |
| Temporal Extent: | 2003-03-06 to 2004-02-01 (V003); 2002-07-04 to present (V004) |
Product Information
Contact Information
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LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 |
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| 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 |
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