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METRIC: High Resolution Satellite Quantification of Evapotranspiration



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Copyright R G Allen University of Idaho 2005 METRIC High Resolution Satellite Quantification of Evapotranspiration University of Idaho Kimberly Idaho Part One Introduction Co developers and Collaborators R Allen M Tasumi R Trezza W Bastiaanssen T Morse W Kramber J Wright Seasonal ET for SE Idaho Idaho from Landsat Major Irrigated areas in Idaho and areas of METRIC application Imperial Valley CA via Landsat 7 Imperial Valley ET mm 0 100 200 300 400 433 ET during January March 2003 Path 35 Alcalde Espanola NWS293031 Jemez Pena Blaca Santa Fe Airport Angostura Albuquerque Candelaria Farms Albuquerque Intl Airport LosLunas Jarales Boys Ranch San Acacia Path 34 Middle Rio Grande of Imperial Valley CA New Mexico via Landsat 7 ET mm yr 0 ETrF 0 00 500 0 25 1000 0 50 1500 0 75 2000 1 00 2500 1 25 Results of METRICtm for Southeastern Idaho 200 miles 3 million acres with 30 m resolution Seasonal ET from Irrigated Areas for S Idaho http maps idwr state id us et Annual ET for all of California Created by SEBALNorth America for 2002 using MODIS satellite imagery resolution 1 km http www sebal us Background on the ET mapping procedure Evapotranspiration mapping with SEBAL and METRICtm Surface Energy Balance Algorithm for Land Dr Wim Bastiaanssen WaterWatch The Netherlands beginning in 1990 SEBAL is commercially applied in the U S A by SEBAL North America Mapping EvapoTranspiration with high Resolution and Internalized Calibration Allen and Tasumi University of Idaho Kimberly beginning in 2000 rooted in SEBAL2000 METRICtm is energy balance based ET mapping tied down and partly calibrated using ground based reference ET from weather data METRICtm works well in advective conditions of the western U S Energy balance gives us actual ET Surface Energy Balance ET is calculated as a residual of the energy balance Rn radiation from sun and sky ET H heat to air ET R n G H Basic Truth Evaporation consumes Energy The energy balance includes all major sources Rn and consumers ET G H of energy



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