OpenET: Filling a Critical Data Gap in Water Management for the Western United States
Melton, Forrest S.; Huntington, Justin; Grimm, Robyn; Herring, Jamie; Hall, Maurice; Rollison, Dana; Erickson, Tyler; Allen, Richard; Anderson, Martha; Fisher, Joshua B.; Kilic, Ayse; Senay, Gabriel B.; Volk, John; Hain, Christopher; Johnson, Lee; Ruhoff, Anderson; Blankenau, Philip; Bromley, Matt; Carrara, Will; Daudert, Britta; Doherty, Conor; Dunkerly, Christian; Friedrichs, MacKenzie; Guzman, Alberto; Halverson, Gregory; Hansen, Jody; Harding, Jordan; Kang, Yanghui; Ketchum, David; Minor, Blake; Morton, Charles; Ortega-Salazar, Samuel; Ott, Thomas; Ozdogan, Mutlu; ReVelle, Peter M.; Schull, Mitch; Wang, Carlos; Yang, Yun; Anderson, Ray G.
Corresponding AuthorMelton, FS (corresponding author), NASA, Cooperat Res Earth Sci & Technol, Ames Res Ctr Moffett Field, Moffett Field, CA 94035 USA.
Year Published2021-11
Abstract in EnglishThe lack of consistent, accurate information on evapotranspiration (ET) and consumptive use of water by irrigated agriculture is one of the most important data gaps for water managers in the western United States (U.S.) and other arid agricultural regions globally. The ability to easily access information on ET is central to improving water budgets across the West, advancing the use of data-driven irrigation management strategies, and expanding incentive-driven conservation programs. Recent advances in remote sensing of ET have led to the development of multiple approaches for field-scale ET mapping that have been used for local and regional water resource management applications by U.S. state and federal agencies. The OpenET project is a community-driven effort that is building upon these advances to develop an operational system for generating and distributing ET data at a field scale using an ensemble of six well-established satellite-based approaches for mapping ET. Key objectives of OpenET include: Increasing access to remotely sensed ET data through a web-based data explorer and data services; supporting the use of ET data for a range of water resource management applications; and development of use cases and training resources for agricultural producers and water resource managers. Here we describe the OpenET framework, including the models used in the ensemble, the satellite, meteorological, and ancillary data inputs to the system, and the OpenET data visualization and access tools. We also summarize an extensive intercomparison and accuracy assessment conducted using ground measurements of ET from 139 flux tower sites instrumented with open path eddy covariance systems. Results calculated for 24 cropland sites from Phase I of the intercomparison and accuracy assessment demonstrate strong agreement between the satellite-driven ET models and the flux tower ET data. For the six models that have been evaluated to date (ALEXI/DisALEXI, eeMETRIC, geeSEBAL, PT-JPL, SIMS, and SSEBop) and the ensemble mean, the weighted average mean absolute error (MAE) values across all sites range from 13.6 to 21.6 mm/month at a monthly timestep, and 0.74 to 1.07 mm/day at a daily timestep. At seasonal time scales, for all but one of the models the weighted mean total ET is within +/- 8% of both the ensemble mean and the weighted mean total ET calculated from the flux tower data. Overall, the ensemble mean performs as well as any individual model across nearly all accuracy statistics for croplands, though some individual models may perform better for specific sites and regions. We conclude with three brief use cases to illustrate current applications and benefits of increased access to ET data, and discuss key lessons learned from the development of OpenET.
Keyword in Englishagriculture consumptive use evapotranspiration field scale Landsat open data systems remote sensing satellite water sustainability
SubtypeArticle ; Early Access
OA Typehybrid
Indexed BySCI-E
WOS IDWOS:000713559100001
WOS SubjectEngineering, Environmental ; Geosciences, Multidisciplinary ; Water Resources
WOS Research AreaEngineering ; Geology ; Water Resources
Source InstitutionUnited States Geological Survey ; University of California, Berkeley ; University of California, Los Angeles
Document Type期刊论文
Affiliation[Melton, Forrest S.; Johnson, Lee; Carrara, Will; Guzman, Alberto] NASA, Cooperat Res Earth Sci & Technol, Ames Res Ctr Moffett Field, Moffett Field, CA 94035 USA; [Melton, Forrest S.; Johnson, Lee; Carrara, Will; Guzman, Alberto] Calif State Univ Monterey Bay Seaside, Dept Appl Environm Sci, Seaside, CA USA; [Huntington, Justin; Volk, John; Bromley, Matt; Daudert, Britta; Dunkerly, Christian; Hansen, Jody; Minor, Blake; Morton, Charles; Ott, Thomas] Desert Res Inst Reno, Hydrol Sci, Reno, NV USA; [Grimm, Robyn; Hall, Maurice; Rollison, Dana] Environm Def Fund, Sacramento, CA USA; [Herring, Jamie; Harding, Jordan] Habitat Seven, Ottawa, ON, Canada; [Erickson, Tyler] Google Inc, Mountain View, CA USA; [Allen, Richard; ReVelle, Peter M.] Univ Idaho Kimberly, Dept Soil & Water Syst, Kimberly, ID USA; [Anderson, Martha; Kang, Yanghui; Schull, Mitch; Yang, Yun; Anderson, Ray G.] ARS, Hydrol & Remote Sensing Lab, USDA, Beltsville, MD USA; [Fisher, Joshua B.] Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci...
Recommended Citation
GB/T 7714
Melton, Forrest S.,Huntington, Justin,Grimm, Robyn,et al. OpenET: Filling a Critical Data Gap in Water Management for the Western United States[J]. United States Geological Survey, University of California, Berkeley, University of California, Los Angeles,2021.
APA Melton, Forrest S..,Huntington, Justin.,Grimm, Robyn.,Herring, Jamie.,Hall, Maurice.,...&Anderson, Ray G..(2021).OpenET: Filling a Critical Data Gap in Water Management for the Western United States.JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION.
MLA Melton, Forrest S.,et al."OpenET: Filling a Critical Data Gap in Water Management for the Western United States".JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION (2021).
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