VNP43MA4N: Daily Nadir BRDF-Adjusted Reflectance at 1km

VIIRS/NPP Nadir BRDF-Adjusted Reflectance Daily L3 Global 1 km SIN Grid Near Real Time (NRT) provides Nadir BRDF-Adjusted Reflectance (NBAR) estimates at 1-kilometer resolution. The product is generated daily using a 16-day rolling window of VIIRS data and employs the RossThick/Li-Sparse-Reciprocal BRDF model to correct for view-angle effects. It includes 18 Science Dataset layers for quality assessment and nadir reflectance across nine VIIRS moderate bands.

Use Cases

• Monitoring land surface albedo changes based on daily, angle-corrected reflectance.
• Modeling surface radiative energy balance using derived black-sky and white-sky albedo layers.
• Analyzing vegetation dynamics and land cover via time-series of corrected reflectance in specific spectral bands.
• Assessing snow and ice albedo trends using the BRDF-adjusted near-infrared and shortwave infrared bands.

Strengths

• Provides daily, near-real-time global coverage at 1km resolution.
• Corrects for bidirectional reflectance distribution function (BRDF) effects using a semi-empirical model.
• Includes 18 distinct Science Dataset layers for reflectance and quality assessment.

Limitations

• Specific column names and data volume (size/rows) are not provided in any source.
• License is ambiguously listed as 'other-license-specified' without explicit details.
• The dataset's update timestamp (2026-04-09) appears to be a future date, which may indicate a metadata error.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Produced from Visible Infrared Imaging Radiometer Suite (VIIRS) data on the Suomi NPP satellite, using the VNP43 algorithm.

Time Range

Daily data product with a 16-day rolling input window.

Freshness

Last updated date listed as 2026-04-09, which is inconsistent.

Geography

Global coverage on a 1 km sinusoidal (SIN) grid.