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Field goniometer measurements are a tool to generate a priori bidirectional reflectance distribution function (BRDF) knowledge for correction and validation of directional reflectance data acquired by air-and spaceborne sensors. This study analyzes the diurnal hemispherical-directional reflectance factor data of an Alfalfa canopy measured during the Digital Airborne Imaging Spectrometer Experiment 1999 (DAISEX'99). We analyze the variation of measured and modeled spectrodirectional vegetationdoi:10.1109/tgrs.2003.811555 fatcat:ociftiqyl5du7ocszfh77aojf4