This directory contains MODIS MOD17 annual/30-arcsec Gross Primary Production (GPP) and Net 
Primary Production (NPP) for 2000 - 2013 in a convenient GIS-friendly GeoTIFF format.  
Please see http://www.ntsg.umt.edu/project/mod17 for an overview of the MOD17 model and 
data product.

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(1.) GENERAL DATASET INFORMATION
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MOD17 MODEL/COLLECTION
VERSION: 055
NOTES/REFERENCES:

TEMPORAL RESOLUTION: Annual (total of annual period)

SPATIAL RESOLUTION: 30-arcsec (0.008333333333 deg)

DATA FORMAT: GeoTIFF

SPATIAL PROJECTION/TILING: WGS84 Geographic 

TEMPORAL EXTENT: 2000 - 2013

SPATIAL EXTENT: Global
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(2.) VARIABLES
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NAME: GPP
DESCRIPTION: Annual Gross Primary Production total
SCALE FACTOR: 0.1 (i.e.--multiply Gpp_1km by 0.1 to get actual value)
UNITS: g carbon m-2

NAME: NPP
DESCRIPTION: Annual Net Primary Production
SCALE FACTOR: 0.1 (i.e.--multiply Npp_1km by 0.1 to get actual value)
UNITS: g carbon m-2
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(3.) INPUT DATA
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INPUT METEOROLOGY: NCEP/NCAR Reanalysis II
NOTES: http://climatedataguide.ucar.edu/reanalysis/ncep-reanalysis-r2

INPUT LAND COVER: MOD12Q1 Version 004; Type 2
NOTES: ftp://ftp.ntsg.umt.edu/pub/MODIS/NTSG_Products/MOD12Q1_FOR_MOD15-17/

INPUT FPAR/LAI: MOD15A2 Version 005
NOTES: Missing/cloud contaminated FPAR/LAI has been infilled.
https://lpdaac.usgs.gov/products/modis_products_table/mod15a2
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(4.) MAIN REFERENCES
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Zhao, M., F. A. Heinsch, R. R. Nemani, and S. W. Running. (2005). Improvements
of the MODIS terrestrial gross and net primary production global data set.
Remote Sensing of Environment, 95: 164.176.

Zhao, M., S. W. Running, and R. R. Nemani. (2006). Sensitivity of Moderate
Resolution Imaging Spectroradiometer (MODIS) terrestrial primary production to
the accuracy of meteorological reanalyses. Journal of Geophysical Research,
111, G01002.

Zhao, M., S. W. Running. (2010). Drought-induced reduction in global
terrestrial net primary production from 2000 through 2009. Science, 329:
940-943.
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(5.) CONTACTS
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Dr. Maosheng Zhao
zhaoms@umd.edu

or

Numerical Terradynamic Simulation Group (NTSG)
University of Montana
http://www.ntsg.umt.edu/contact
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