This directory contains MODIS MOD17 8-day/1km Gross Primary Production (GPP) and Net
Photosynthesis (PsnNet) for 2000 - 2013.  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: 8-day (total over 8-day period)

SPATIAL RESOLUTION: 1km

DATA FORMAT: HDF-EOS

SPATIAL PROJECTION/TILING: MODIS Sinusoidal Grid Tiling System (tiles with 1200 * 1200 rows/columns)

TEMPORAL EXTENT: 2000 - 2013

SPATIAL EXTENT: Global
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(2.) VARIABLES
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NAME: Gpp_1km
DESCRIPTION: 8-day Gross Primary Production total
SCALE FACTOR: 0.0001 (i.e.--multiply Gpp_1km by 0.0001 to get actual value)
UNITS: kg carbon m-2

NAME: PsnNet_1km
DESCRIPTION: 8-day Net Photosynthesis (GPP - maintenance respiration)
SCALE FACTOR: 0.0001 (i.e.--multiply Npp_1km by 0.0001 to get actual value)
UNITS: kg carbon m-2

NAME: Psn_QC_1km
DESCRIPTION: PsnNet_1km 8-bit Quality Control
UNITS:
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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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