VIIRS Daily Surface Reflectance with 500m and 1km NRT Grid

VNP09GA_NRT provides near real-time daily surface reflectance estimates from the Suomi NPP VIIRS satellite across 12 reflective bands (I1-I3, M1-M5, M7, M8, M10, M11). Data is processed on a global 10km x 10km tile grid at 500m and 1km resolution, with atmospheric corrections for gases and aerosols. The product is generated by NASA for daytime land conditions and is available in Hierarchical Data Format 5 (HDF5) files.

Use Cases

• Monitoring vegetation indices (NDVI) using corrected reflectance from bands like M5 (red) and M7 (near-infrared).
• Tracking land surface changes from events like fires or floods by analyzing daily reflectance in multiple spectral bands.
• Assessing aerosol impacts and atmospheric conditions by comparing top-of-atmosphere and surface reflectance values.
• Studying surface thermal properties through related bands, supported by the dataset's earth-science-surface-thermal-properties tag.

Strengths

• Provides data in near real-time (NRT) with a defined file naming convention indicating acquisition and production timestamps.
• Offers global coverage through a standardized 10km x 10km tile system compatible with MODIS.
• Includes atmospheric correction for multiple effects, using inputs from VIIRS cloud, aerosol, and reanalysis data products.
• Delivers surface reflectance at two spatial resolutions (500m and 1km) across 12 VIIRS reflective bands.

Limitations

• Key metadata such as row count, file size, and specific license terms are not provided by any source.
• Data is only produced for daytime land conditions; pixels for night and oceans are filled with null values.
• The authoritative user guide link appears truncated in multiple source descriptions.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing from the Suomi NPP spacecraft's VIIRS instrument, processed through a Level-2G algorithm.

Time Range

null

Freshness

2026-03-12 23:10:02.663936

Geography

Global land coverage, excluding oceans.