NOAA-18 AVHRR: Daily Global Vegetation Index at 0.05 Degree Resolution

A daily global land surface climate data record derived from NOAA-18 satellite imagery. The dataset is produced by NASA's Long-Term Data Record (LTDR) project, which bridges data from multiple polar-orbiting satellite missions. It provides atmospherically corrected Normalized Difference Vegetation Index (NDVI) values at a 0.05-degree spatial resolution.

Use Cases

• Monitor global vegetation health and phenology based on daily NDVI values.
• Study long-term climate change impacts on land surfaces based on the climate data record.
• Validate or calibrate other satellite-derived vegetation products based on the LTDR bridge methodology.
• Model carbon cycle dynamics based on vegetation index and related biophysical parameters.

Strengths

• Data is part of a validated, long-term climate data record (CDR) critical for climate studies.
• Product is atmospherically corrected and derived from BRDF-corrected surface reflectance, suggesting high processing quality.
• Spatial resolution is specified as 0.05 degrees (approximately 5.5 km at the equator).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and file size are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Generated from GIMMS Advanced Processing System (GAPS) BRDF-corrected Surface Reflectance product derived from NOAA-18 AVHRR satellite data.

Time Range

Daily coverage; specific date range is not provided in the input.

Freshness

Last updated 2026-03-12 23:18:02.815705; freshness should be verified.

Geography

Global coverage at 0.05-degree resolution.