NOAA-09 AVHRR: Daily Global Top-of-Atmosphere Reflectance at 0.05-Degree Resolution

NOAA-09 AVHRR Top-of-Atmosphere Reflectance Daily L3 Global 0.05 Deg. CMG is a dataset from NASA's Long-Term Data Record project. It provides daily global surface reflectance data derived from the NOAA-9 satellite's Advanced Very High Resolution Radiometer, processed through the GIMMS Advanced Processing System. The dataset includes reflectance for bands 1 and 2, quality flags, solar/view angles, thermal data, and scan time, serving as a fundamental record for climate studies.

Use Cases

• Monitoring global vegetation health based on the derived Normalized Differential Vegetation Index (NDVI).
• Studying land surface radiative properties based on top-of-atmosphere reflectance for bands 1 and 2.
• Analyzing surface energy balance and thermal patterns based on thermal bands 3, 4, and 5.
• Investigating bidirectional reflectance distribution function (BRDF) effects based on the BRDF-corrected surface reflectance source product.
• Tracking long-term climate change indicators as part of the validated Climate Data Record (CDR).

Strengths

• Part of a validated Climate Data Record (CDR) critically important for studying global climate change.
• Integrates data from eight distinct AVHRR missions, including NOAA-7 through NOAA-19 and MetOp-B.
• Provides daily temporal resolution at a global 0.05-degree spatial scale.
• Includes multiple data layers: reflectance, quality flags, angles, and thermal data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total dataset size are unknown, which may limit suitability assessment.
• The Leaf-Area Index/fPAR product is described as experimental.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Generated from GIMMS Advanced Processing System (GAPS) BRDF-corrected Surface Reflectance product (AVH01C1) using the NOAA-9 AVHRR instrument.

Time Range

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

Freshness

Last updated 2026-03-12 23:15:29.126102; freshness should be verified.

Geography

Global coverage.