VJ116A2GF: Gap-Filled Global Evapotranspiration at 500m

NOAA-20 VIIRS provides gap-filled 8-day composites of actual and potential evapotranspiration at a 500-meter pixel resolution. The algorithm uses the Penman-Monteith equation, integrating daily meteorological reanalysis with VIIRS vegetation and albedo data. This product is not available in near-real-time, as it is generated only at the end of each year after quality screening and interpolation of vegetation inputs.

Use Cases

• Monitoring agricultural water use based on 8-day total evapotranspiration layers.
• Modeling land surface energy balance using latent heat flux (LE) and potential latent heat flux (PLE) layers.
• Assessing drought and hydrological conditions through gap-filled, quality-controlled annual data composites.
• Validating climate and hydrological models with global, 500m-resolution ET and PET estimates.

Strengths

• Provides gap-filled data with poor-quality pixels cleaned via linear interpolation, based on quality control labels.
• Offers a high spatial resolution of 500 meters for detailed land surface analysis.
• Algorithm is based on the physically-based Penman-Monteith equation, integrating satellite and reanalysis data.

Limitations

• Data is not available in near-real-time; it is generated only at the end of each calendar year.
• The last composite period of each year is only 5 or 6 days, not a full 8-day period.
• Specific column names, row counts, and dataset size are not provided in the available metadata.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing from the NOAA-20 VIIRS instrument, processed using an algorithm based on the Penman-Monteith equation.

Freshness

2026-04-09 21:08:38.599179

Geography

Global