Gridded Daily Potential Evapotranspiration Data
The maps of potential evapotranspiration (ET) shown below are calculated from satellite-derived measurements of solar radiation and average air temperatures. The ET values on the maps are a reasonable estimate of daily crop water use for most crops that have reached at least 80% coverage of the ground. Prior to 80% or greater coverage, ET will be a fraction of the map value in proportion to the amount of coverage. The map values may vary slightly from ET estimates from AWON and other more site-specific models, but these differences are believed to be within the uncertainty of even measurements of actual water use made directly in a given field.
For more details on the science behind these products, see Diak et al, "Agricultural Management Decision Aids Driven by Real-Time Satellite Data", Bulletin of the American Meteorological Society 79 (1998): 1345-1355. Link to article. Download PDF.
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Daily map for Sep 30, 2023 (1 day ago)
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Download evapotranspiration data grid for Sep 30, 2023
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