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MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid V005

V005 MOD09GQ Changes  (abbreviated Points of Interest below)

V005 MOD09GQ Science Data Sets  (specifications for data layers)

V005 MOD09GQ Quality Control Bit Legend

V005 Surface Reflectance Accuracy

Band 1 – Red Reflectance Band 2 – NIR Reflectance	MOD09GQ.A2007087.h08v06 NDVI calculated from Band 1 and Band 2
Data Set Characteristics: Area: ~10 degrees x 10 degrees lat/long Dimensions: 4800 x 4800 rows/columns File Size: ~280 MB compressed Projection: Sinusoidal Data Format: HDF-EOS Resolution: 250 meters Science Data Sets (SDS HDF Layers): 5	To the left are MODIS 250-m reflectance data acquired March 28, 2007 over Mexico (h08v06) and used in a simple band ratio to create the NDVI image on the right.

V005 Change Points of Interest:

• Reduced number of data products:  MOD09GST, MOD09GHK, MODMGGAD, MODPT1KD, MODPTHKM encapsulated within MOD09GA 
• Revised methodology for choosing first layer observation
• Reduced file volume:  internal compression

Product Description
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 Band 1 and 2 at 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, 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.

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Retrieve the MOD09GQ.5 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MOD09GQ.5&group=MOLT
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLT/MOD09GQ.005/

Order Data through the EOS Data Gateway
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EOS Data Gateway Search Tips

Data Center:	LPDAAC
Sensor:	MODIS
Dataset:	MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid V005
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

Product Description (http://modis-land.gsfc.nasa.gov/surfrad.htm)

User Guide (http://modis-sr.ltdri.org/MAIN_SURFACE_PRODUCTAND%20USER%20GUIDE/MOD09_UserGuide.pdf)

Algorithm Theoretical Basis Document (ATBD) (http://modis.gsfc.nasa.gov/data/atbd/atbd_mod08.pdf)

MODIS Standard Data Products Catalog (http://modis.gsfc.nasa.gov/data/dataprod/index.php)

EOS Data Products Handbook Volume 1 (2000) (http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol1.php)

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

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