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MODIS/Terra Gross Primary Productivity 8-Day L3 Global 1km SIN Grid V005

V005 MOD17A2 Changes (abbreviated Points of Interest below)

V005 MOD17A2 Science Data Sets (specifications for data layers)

V005 MOD17A2 Quality Information

Users are advised to consider improved products at ntsg.umt.edu

MOD17A2 Gross Primary Productivity	MOD17A2 Net Photosynthesis
Data Characteristics Area: ~10 degrees x 10 degrees lat/long Dimensions: 1200 x 1200 rows/columns File Size: ~ 0.2 MB compressed Resolution: 1 kilometer Projection: Sinusoidal Data Format: HDF-EOS Science Data Sets (SDS HDF Layers): 3	These images are examples of the GPP and PSN values reported in the MOD17A2 product data acquired February 10, 2007 in tile h12v12 over Chile and Argentina.  The fertile Central Valley along Chile’s coastline and the agricultural lowlands of Las Pampas in Argentina appear in lighter colors due to abundant vegetation in those areas.

V005 Change Points of Interest:

• Data Set Name change to emphasize Gross Primary Production over Net Photosynthesis
• Modification of parameters in Biome Property Look-Up Table (BPLUT) to agree with GPP derived from measurements at eddy flux towers and synthesized NPP
• Spatially non-linear interpolation of coarse resolution meteorological data into 1-km MODIS pixel level, instead of nearest neighbor sampling, to increase the accuracy of meteorological data input at pixel level
• Reduced file volume by using internal compression

V005 Limitations:

• BPLUT may be subject to change if LAI/FPAR or meteorological inputs have large changes
• 8-day data are subject to incorrect estimates caused by contaminated LAI/FPAR, and require special processing.  Users are encouraged to consider the “clean” products available from ntsg.umt.edu.

Product Description
The MODerate-resolution Imaging Spectroradiometer (MODIS) Gross Primary Productivity (GPP) product (MOD17A2) is a cumulative composite of GPP values based on the radiation use efficiency concept that may be used as inputs to data models for calculating terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. MOD17A2 is an 8-day composite at 1-kilometer spatial resolution provided as a gridded level-4 product in the Sinusoidal projection.

Version-5 MODIS/Terra GPP 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. Although there may be later improved versions, these data are ready for use in scientific publications.

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Retrieve the MOD17A2.5 MODIS product through the LP DAAC Data Pool
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Data Center:	LPDAAC
Sensor:	MODIS
Dataset:	MODIS/Terra Gross Primary Productivity 8-Day L3 Global 1km SIN Grid V005
Spatial:	HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min
Geographic Extent:	Type Lat/Long Range or Draw on Map
Temporal Extent:	2000-02-18 to present

Product Information

Product Description http://modis-land.gsfc.nasa.gov/npp.htm

User Guide http://www.ntsg.umt.edu/modis/MOD17UsersGuide.pdf

Algorithm Theoretical Basis Document (ATBD) http://modis.gsfc.nasa.gov/data/atbd/atbd_mod16.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
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