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Description

The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Gross Primary Productivity (GPP) and Net Photosynthesis (PSN) (VNP17A2) Version 2 data product is a cumulative composite of GPP values based on the radiation use efficiency concept that is potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. VNP17A2 is an 8-day composite at 500 meter (m) spatial resolution delivered as a gridded Level 4 (L4) product in Sinusoidal projection.

Provided in the VNP17A2 product are layers for GPP, PSN, along with a quality control layer. A low resolution browse image for GPP is also available for each VNP17A2 granule.

Known Issues

Version Description

Collection Version 2 Processing and Reprocessing

Product Summary

Platforms
Suomi-NPP
Instruments
VIIRS
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Spatial Resolution
500 Meters x 500 Meters
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2025-01-01 to Present
Temporal Resolution
8 Day
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC)
Land Science Investigator-led Processing System, Terrestrial Information Systems Laboratory, Earth Sciences Division, Sciences and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/LandSIPS)
Concept ID
C2872602075-LPCLOUD
Data State
ACTIVE
Processing Level
4
Published
Updated
Science Keywords
Evapotranspiration,
Evaporation,
Latent Heat Flux

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Zhao, M., Kimball, J., & Devadiga, S. (2025). VIIRS/NPP Gross Primary Productivity and Net Photosynthesis 8-Day L4 Global 500m SIN Grid V002 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/VIIRS/VNP17A2.002 Date Accessed: 2025-10-22

File Naming Convention

VNP17A2.A2025193.h29v06.002.2025224205232.h5

The file name begins with the Product Short Name (VNP17A2) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2025193), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h29v06), the Version of the data collection (002), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2025224205232), and the Data Format (h5).

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
Gpp_500m Gross Primary Productivity kgC/m²/8day uint16 32761 32761 to 32700 0.0001
PsnNet_500m Net Photosynthesis kgC/m²/8day uint16 32761 32761 to 32700 0.0001
Psn_QC_500m Quality control indicators N/A uint8 255 255 to 254 N/A
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