daily evapotranspiration by combining remote sensing with ground observations: study from maricopa,...
DESCRIPTION
Remote sensing –Beyond images Mexico 14-15 December 2013 The workshop was organized by CIMMYT Global Conservation Agriculture Program (GCAP) and funded by the Bill & Melinda Gates Foundation (BMGF), the Mexican Secretariat of Agriculture, Livestock, Rural Development, Fisheries and Food (SAGARPA), the International Maize and Wheat Improvement Center (CIMMYT), CGIAR Research Program on Maize, the Cereal System Initiative for South Asia (CSISA) and the Sustainable Modernization of the Traditional Agriculture (MasAgro)TRANSCRIPT
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Daily evapotranspiration by combining remote sensing with ground
observations: Study from Maricopa, Arizona USA
Andy French and Doug [email protected]
U.S. Arid Land Agricultural Research Center, USDA/ARS, Maricopa, AZ USA
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Obtaining Daily ET Estimates Useful for Growers
•Remote sensing provides synoptic views and ways to model instantaneous ET•Obstacles;• Image data too infrequent• Or too coarse• Costly
•Combine remote sensing data with ground observations• Obtain image data as available• Continuous monitoring of meteorology and land surface temperatures• Model spatial LST and vegetation cover • Compute surface energy balance hourly, integrate to daily
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Penman-Monteith Equation
DiabaticFlux
AdiabaticFlux
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Energy Flux Equations
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Surface Flux Modeling Remote Sensing Inputs
NDVI
Temperature
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Surface Energy Balance ASTER El Reno, Oklahoma
4 Sep 2000
SensibleHeat
LatentHeat
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Daily Evapotranspiration4 Sep 2000
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90 m
91 m
64%
4%
FAO Irrigation Scheduling Experiment SiteMaricopa, Arizona
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Integrated Monitoring of Crop and Irrigation
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Wireless-Based Sensors for Water Management
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Maricopa Irrigation Scheduling Experiment 2003Cotton
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Simplifying LST to Assist Daily Forecast of ET
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Heat Units and Kalman Filtering to Forecast Spatially Distributed Cover & LST
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Need Mean & SD Cover Estimates
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Daily ET Modeling & Accuracy Assessment
Use parameter uncertainties to model ET uncertaintyCompare ET estimates against P-M and soil moisture
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Remote Sensing Resolution and Local Vegetation/Soil Scales
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Thermal Imaging & ET: Some Variations Irrelevant for Daily Estimates
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Winter Wheat Grazingland
NDVI NDVI
Emissivity
Newer Remote Sensing CapabilitiesMultispectral Thermal Infrared
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Emissivity Change at Palo Verde Irrigation District 2007-8
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Conclusions
•Combined Remote Sensing & Ground-Based Sensors •Daily ET for Water Management•Reasonable resolution & forecast potential•Reasonable Cost•New satellite sensors will improve ET estimation accuracies•Uncertainty estimation important part of advisory system