Daily Evapotranspiration Estimates for the Contiguous United States at 70-Meter Resolution

ECOSTRESS Tiled Evapotranspiration disALEXI 24-Hour L3 CONUS 70 m V002 provides daily evapotranspiration (ET) estimates derived from spaceborne thermal radiometer data. The dataset is produced by NASA's LPCLOUD using a physics-based Two-Source Energy Balance model applied to measurements from the International Space Station. It covers the Conterminous United States with a 70-meter spatial resolution.

Use Cases

• Modeling crop water use by analyzing daily Evapotranspiration values across agricultural regions.
• Detecting vegetation water stress for drought early warning using the land surface temperature-derived Evapotranspiration Daily feature.
• Monitoring phenology and ecosystem health by tracking temporal changes in the Evapotranspiration Daily variable.
• Assessing uncertainty in ET estimates by incorporating the provided Evapotranspiration Daily Uncertainty data field.

Strengths

• High 70-meter spatial resolution for detailed regional analysis.
• Data derived from a physics-based Two-Source Energy Balance (TSEB) model, enhancing physical consistency.
• Provides separate data layers for both the primary Evapotranspiration Daily value and its associated Uncertainty.

Limitations

• Coverage is limited to the Conterminous United States (CONUS), excluding global and other regional data.
• Known acquisition gaps exist due to instrument anomalies in September 2018 and March 2019, creating temporal inconsistencies.
• Spatial coverage is constrained to latitudes between 52° N and 52° S, missing polar regions.

Provenance

Source

NASA LPCLOUD, derived from ECOSTRESS instrument data on the International Space Station.

Collection Method

Produced using the DisALEXI disaggregation algorithm applied to ECOSTRESS L2 land surface temperature, STARS NDVI/albedo, and CFSR meteorology data.

Time Range

Data acquisition began after the instrument launch on June 29, 2018, with operations resuming after anomalies in December 2018 and May 2019.

Freshness

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Geography

Conterminous United States (CONUS), within 52° N to 52° S latitude band.