VIIRS/JPSS1 VJ117A2: Global Vegetation Productivity 8-Day 500m Grid

NOAA-20 VIIRS VJ117A2 Version 2 is a Level 4 gridded data product providing cumulative composites of Gross Primary Productivity (GPP) and Net Photosynthesis (PSN) for terrestrial vegetation. The dataset is based on the radiation use efficiency concept and is delivered as an 8-day composite at a 500-meter spatial resolution in a Sinusoidal projection. It includes layers for GPP, PSN, and a quality control layer, serving as inputs for modeling terrestrial energy, carbon, and water cycle processes.

Use Cases

• Modeling terrestrial carbon sequestration based on global 8-day GPP composites.
• Analyzing vegetation health and photosynthetic activity trends using 500m resolution PSN data.
• Assessing data quality for ecosystem models with the provided quality control layer.
• Integrating radiation use efficiency estimates into studies of the water and energy cycles.

Strengths

• Provides global coverage at a consistent 500-meter spatial resolution.
• Offers temporally dense observations with an 8-day composite frequency.
• Contains multiple scientifically relevant layers (GPP, PSN, quality control) for analysis.

Limitations

• Metadata completeness is low; specific column names, row counts, and file sizes are not provided on any platform.
• Known issues exist but are not detailed in the provided descriptions, requiring users to consult an external website.
• The listed last update date (2026-04-09) is in the future, casting doubt on the accuracy of this metadata field.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing via the NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS) sensor.

Freshness

2026-04-09 21:04:47.827441 (Note: This date is in the future, indicating a potential metadata error)

Geography

Global