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SIMS Accuracy Assessment <br />•Field validation campaign completed in <br />partnership with partner growers, CA <br />DWR, CSU Fresno, USDA ARS and UC <br />Davis. <br />•Data collected for 15 crops at 30 sites <br />using eddy covariance, surface energy <br />balance residual, soil moisture sensor <br />networks. <br />•Results highly encouraging for seasonal <br />and daily comparisons. <br />•11% mean absolute error for seasonal ETcb vs <br />measured ETa (via eddy covariance / surface <br />energy balance residual; n = 12) <br />•14.2% mean absolute error for seasonal ETcb <br />vs measure ETa (via soil water balance; n = <br />23)  reduced to 8.7% for well-irrigated crops <br />only (n = 16) <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />