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Mapping daily evapotranspiration at field scales over rainfed and irrigated agricultural areas using remote sensing data fusion

1 Introduction</h5> Agricultural areas occupy approximately 3,730,000 km 2 (38%) of the total land area in the U.S. ( www.agcensus.usda.gov ). Of this agricultural land, about 5–7% is routinely irrigated to enhance crop yield and quality ( Ozdogan and Gutman, 2008 ). This small portion generates about 50% of the total amount of agricultural crop income ( Schaible and Aillery, 2012 ). In 2005, 490,000 million m 3 per day of water were used for irrigation, corresponding to 62% of total freshwater withdrawals if thermoelectric power is excluded ( http://ga.water.usgs.gov/edu/wuir.html ). These statistics highlight the need for accurate monitoring of water use at field scales over large irrigated agricultural areas, such as irrigation districts, to facilitate optimization of water use and allocation among different competing uses.</P>In the last two decades, major improvements in large-area estimates of actual evapotranspiration (ET) have been obtained through remote sensing methods based on thermal infrared (TIR) data, which have become increasingly available from a variety of satellite systems. The land-surface temperature (LST) derived from these observations plays a key role in the partitioning of available energy between turbulent fluxes of sensible and latent heat, the latter of which describes the land-surface water loss http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Agricultural and Forest Meteorology Elsevier
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