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Regional ET estimation from satellites

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dc.contributor.authorSamani, Zohrab, author
dc.contributor.authorBleiweiss, Max, author
dc.contributor.authorNolin, Simon, author
dc.contributor.authorSkaggs, Rhonda, author
dc.contributor.authorU.S. Committee on Irrigation and Drainage, publisher
dc.date.accessioned2020-04-01T12:47:40Z
dc.date.available2020-04-01T12:47:40Z
dc.date.issued2005
dc.descriptionPresented during the Third international conference on irrigation and drainage held March 30 - April 2, 2005 in San Diego, California. The theme of the conference was "Water district management and governance."
dc.description.abstractCrop evapotranspiration (ET) is a major component of the hydrologic system. ET values are used in irrigation water management, water rights allocation, hydrological modeling and water resource planning and management. Traditionally, ET has been estimated using crop coefficient and climatic parameters. Point measurement of ET can also be made through soil moisture monitoring, vapor flux measurement or energy balance using the eddy-covariance method. However, traditional methods will only provide point measurements of ET and do not account for spatial variability of ET in large scale. Recent advances in remote sensing have made it possible to develop regional maps of ET with high precision. A procedure was developed to use the combination of satellite data, ground level weather stations and point measurements of ET, to estimate and develop regional ET maps. The Regional ET Estimation Model (REEM) is based on energy balance at the crop canopy. The model uses incidental values of NDVI, near infrared temperature and albedo, from satellites to calibrate the sensible heat flux equation. The sensible heat flux equation is calculated daily and is modified spatially using well defined nodes in the watershed based on an optimization technique. The REEM based ET values were compared with direct measurement of ET in pecans in Southern New Mexico. The comparison showed that the crop ET can be calculated from REEM model with high precision.
dc.description.sponsorshipSponsored by USCID; co-sponsored by Association of California Water Agencies and International Network for Participatory Irrigation Management.
dc.format.mediumborn digital
dc.format.mediumCD-ROMs
dc.format.mediumproceedings (reports)
dc.identifier.urihttps://hdl.handle.net/10217/201710
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofAg Water Conservation Policy
dc.relation.ispartofWater district management and governance, March 30-April 2, 2005, San Diego, California
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.sourceContained in: Water district management and governance, San Diego, California, March 30 - April 2, 2005, http://hdl.handle.net/10217/46458
dc.titleRegional ET estimation from satellites
dc.typeText

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