VJ143D36: VIIRS Shortwave BRDF Geometric Parameter Daily Global 1km

Daily VJ143D36 files provide the geometric model parameter for the VIIRS shortwave broadband (1.61 μm) at 30 arc-second (1,000 meter) resolution. This parameter, combined with isotropic and volumetric parameters from the VJ143D product suite, is used to derive Bidirectional Reflectance Distribution Function (BRDF) and albedo values for climate modeling. The data are produced using a 16-day temporal window, weighted to the ninth day, and are projected on a global Climate Modeling Grid (CMG).

Use Cases

• Calibrating climate simulation models based on the global Climate Modeling Grid (CMG) coverage.
• Deriving land surface shortwave albedo values based on the geometric BRDF parameter in conjunction with isotropic and volumetric parameters.
• Analyzing temporal changes in surface reflectance anisotropy using the daily production cycle with a 16-day composite window.
• Assessing land surface radiative properties for the VIIRS shortwave broadband (1.61 μm) based on the specific geometric parameter.

Strengths

• Provides a specific, single data layer (the geometric parameter for the shortwave broadband) at a consistent 1km global resolution.
• Incorporates algorithm improvements from the S-NPP VIIRS V002 version, including improved calibration and geolocation accuracy.
• Is part of a cross-platform, standardized product suite (VJ143D01-VJ143D39) from a major space agency (NASA).

Limitations

• Critical metadata such as row count, file size, and specific column names are unavailable across all platform entries.
• The 'last updated' metadata shows a future date (2026-03-12 on datagov), indicating a potential conflict or error in platform metadata.
• Each file contains only one data layer, requiring users to combine multiple files (VJ143D01-VJ143D39) for a complete BRDF model analysis.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Produced daily from NOAA-20 VIIRS sensor data using a documented algorithm (ATBD referenced).

Time Range

Daily production with a 16-day temporal composite window.

Freshness

2026-03 12 20:21:15.200207 (Note: This is a future date, suggesting a metadata error)

Geography

Global coverage on a Climate Modeling Grid (CMG).