---
access_dt: ~
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data_qualifier: ~
description: 'Net Primary Productivity (NPP) defines the rate at which all plants in an ecosystem produce net useful chemical energy.  In other words, NPP is equal to the difference between the rate at which plants in an ecosystem produce useful chemical energy (or GPP), and the rate at which they expend some of that energy for respiration.  The version-55 of the NPP product is produced by the Numerical Terradynamic Simulation Group (NTSG)/University of Montana (UMT).  It corrects the problem with cloud-contaminated MODIS LAI-FPAR inputs to the MOD17 algorithm.  The original, uncorrected datasets constitute the version-4 NPP products.  For further details regarding the differences between the NTSG and NASA versions of this product, please consult the document referenced in the following news release: Terra MODIS GPP/NPP Products from NTSG/University of Montana  Version-55 Terra/MODIS NPP products are validated to Stage-3; this means that its accuracy was assessed and uncertainties in the product were well-established via independent measurements made in a systematic and statistically robust way that represents global conditions.  These data are deemed ready for use in science applications.'
description_attribution: https://lpdaac.usgs.gov/dataset_discovery/modis
display_name: Terra/MODIS Net Primary Production Yearly L4 Global 1km
doi: ~
end_time: ~
files: []
href: http://52.38.26.42:8080/dataset/nasa-lpdaac-mod17a3.yaml
identifier: nasa-lpdaac-mod17a3
instrument_measurements: []
lat_max: ~
lat_min: ~
lon_max: ~
lon_min: ~
name: Terra/MODIS Net Primary Production Yearly L4 Global 1km
native_id: ~
parents: []
processing_level: 1200 x 1200 rows/columns
publication_year: ~
references: []
release_dt: ~
scale: ~
scope: ~
spatial_extent: '~10 x 10 lat/long'
spatial_ref_sys: ~
spatial_res: 1 kilometer
start_time: ~
temporal_extent: 'January 1, 2000 - December 31, 2010'
temporal_resolution: ~
type: dataset
uri: /dataset/nasa-lpdaac-mod17a3
url: 'https://lpdaac.usgs.gov/dataset_discovery/modis/modis_products_table/mod17a3 '
variables: ~
version: ~
vertical_extent: ~