VJ109GA_NRT: VIIRS Daily Surface Reflectance at 500m and 1km

VIIRS/JPSS1 Surface Reflectance Daily L2G Global 1km and 500m SIN Grid NRT provides near real-time estimates of land surface reflectance. The dataset corrects top-of-atmosphere reflectance for atmospheric effects from gases and aerosols, using inputs from other VIIRS products and reanalysis data. It is produced daily for daytime conditions over global land areas, excluding oceans, and is tiled on a 10km x 10km grid compatible with MODIS.

Use Cases

• Monitoring vegetation health and phenology based on corrected surface reflectance in multiple spectral bands.
• Assessing land surface albedo and energy balance using atmospherically corrected reflectance values.
• Inputting corrected reflectance data into land cover classification or change detection algorithms.
• Validating atmospheric correction models by comparing top-of-atmosphere and surface reflectance products.

Strengths

• Provides data in near real-time (NRT), supporting time-sensitive applications.
• Offers global daily coverage at two spatial resolutions (500m and 1km).
• Applies detailed atmospheric corrections for molecular gases and aerosols, improving data accuracy for land surface studies.

Limitations

• Metadata on specific columns, row counts, and file sizes is unavailable across all sources.
• Data is only produced for daytime conditions and excludes oceanic pixels.
• One source lists a last updated date in the future (2026-04-09), indicating potential metadata inconsistency.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing from the VIIRS instrument aboard the Suomi NPP/JPSS1 satellite, processed through a Level-2G atmospheric correction algorithm.

Time Range

Daily coverage, specific start date not provided.

Freshness

2026-04-09 20:46:41.844213 (Note: This is a future date, suggesting a metadata anomaly)

Geography

Global land coverage, tiled using the MODIS Sinusoidal (SIN) grid projection.