VJ119A2: Daily Global Land Aerosol Data at 750m Resolution

Global daily satellite measurements of land aerosol optical depth and related atmospheric properties at 750-meter resolution. The VJ119A2 product is produced by NOAA-20 VIIRS using the MAIAC algorithm and provides layers for AOD, uncertainty, smoke plume height, and view geometry. Known issues include reduced accuracy at high sun angles, potential artifacts near coastlines, and an unreliable ice mask.

Use Cases

• Monitoring air pollution and smoke plumes based on AOD and injection height layers.
• Improving atmospheric correction for surface reflectance products based on the provided AOD and view geometry.
• Studying aerosol types and properties over land and ocean based on fine mode fraction and Angstrom exponent layers.
• Assessing data quality and uncertainty for downstream applications based on the provided QA and uncertainty layers.

Strengths

• Provides daily global coverage at a high spatial resolution of 750 meters.
• Includes multiple derived layers such as AOD uncertainty, fine mode fraction, and smoke injection height.
• Product description details specific known issues and accuracy limitations for user awareness.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Known algorithmic issues include reduced performance at solar zenith angles >78° and potential artifacts within 1-3 pixels of coastlines.

Provenance

Source

NOAA-20 Visible Infrared Imaging Radiometer Suite (VIIRS), processed by LPCLOUD.

Collection Method

Satellite remote sensing processed with the Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm.

Freshness

Daily production frequency; last update date is unknown.

Geography

Global