VJ143MA4N: Daily Global Nadir BRDF-Adjusted Reflectance at 1 km

VIIRS/NPP VJ143MA4N provides daily, near-real-time Nadir BRDF-Adjusted Reflectance estimates at a 1-kilometer resolution, correcting for view angle effects using a 16-day data window. Its 18 Science Dataset layers include nadir reflectance for nine moderate bands and integrated black-sky and white-sky albedo, enabling detailed surface anisotropy analysis. Researchers can use the provided BRDF model parameters to manually estimate albedo for any solar illumination angle.

Use Cases

• Monitoring land surface albedo changes based on daily, angle-corrected reflectance data.
• Modeling surface anisotropic effects using the RossThick/Li-Sparse-Reciprocal BRDF model parameters.
• Estimating instantaneous blue-sky albedo by combining the provided black-sky and white-sky albedo layers.
• Analyzing surface radiative properties across VIIRS moderate bands M1-M5, M7-M8, and M10-M11.

Strengths

• Provides daily, near-real-time global coverage, enabling timely environmental monitoring.
• Corrects for view angle effects using a sophisticated semi-empirical BRDF model (RTLSR), resulting in stable reflectance estimates.
• Includes 18 distinct Science Dataset layers for comprehensive analysis of reflectance and albedo.

Limitations

• Key metadata such as specific file size, row count, and author information is missing from all provided sources.
• The license is ambiguously listed as 'other-license-specified' without explicit terms.
• Spatial resolution is fixed at 1 km, which may be insufficient for fine-scale local studies.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Produced daily from VIIRS/NPP satellite data using the VJ143MA4N algorithm.

Time Range

Daily production, utilizing a rolling 16-day window of VIIRS data.

Freshness

Last updated on 2026-04-09 according to datagov entries.

Geography

Global coverage on a 1 km SIN Grid.