Crop water use dynamics over arid and semi-arid croplands in the lower Colorado River Basin

European Journal of Remote Sensing (TEJR)
By: , and 



Numerous studies have evaluated the application of Remote Sensing (RS) techniques for mapping actual evapotranspiration (ETa) using Vegetation-Index-based (VI-based) and surface energy balance methods (SEB). SEB models computationally require a large effort for application. VI-based methods are fast and easy to apply and could therefore potentially be applied at high resolution; however, the accuracy of VI-based methods in comparison to SEB-based models remains unclear. We tested the ETa computed with the modified 2-band Enhanced Vegetation Index (METEVI2) implemented in the Google Earth Engine – for mapping croplands’ water use dynamics in the Lower Colorado River Basin. We compared METEVI2 with the well-established RS-based products of OpenET (Ensemble, eeMETRIC, SSEBop, SIMS, PT_JPL, DisALEXI and geeSEBAL). METEVI2 was then evaluated with measured ETa from four wheat fields (2017–2018). Results indicated that the monthly ETa variations for METEVI2 and OpenET models were comparable, though of varying magnitudes. On average, METEVI2 had the lowest difference rate from the average observed ETa with 17 mm underestimation, while SIMS had the highest difference rate (82 mm). Findings show that METEVI2 is a cost-effective ETa mapping tool in drylands to track crop water use. Future studies should test METEVI2’s applicability to croplands in more humid regions.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Crop water use dynamics over arid and semi-arid croplands in the lower Colorado River Basin
Series title European Journal of Remote Sensing (TEJR)
DOI 10.1080/22797254.2023.2259244
Volume 56
Issue 1
Year Published 2023
Language English
Publisher Taylor & Francis
Contributing office(s) Southwest Biological Science Center
Description 2259244, 22 p.
Country United States
Other Geospatial Lower Colorado River basin
Google Analytic Metrics Metrics page
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