Abstract
A method of estimating surface net radiation using visible, near-infrared and thermal-infrared data from the Advanced Very High Resolution Radiom eter (AVHRR) onboard NOAA-11 was examined. Shortwave radiation balance was evaluated from measured incident solar radiation and surface albedo estimated by the use of visible (Ch1) and near-infrared (Ch2) channels of AVHRR. Longwave radiation balance was evaluated from surface temperature estimated by the use of thermal-infrared channels of AVHRR, and atmospheric radiation calculated from radiosonde data. The derived surface net radiation was compared to that collected with ground-based instruments at a forest and a sand dune during several days coincident with NOAA-11 passing over. Overall, satisfactory results were obtained. The results imply that net radiation maps of a large area can be constructed by combining ground-based and remote-sensed data. In order to improve the albedo estimation accuracy, it is necessary to apply a bidirectional reflectance model to the estimated isotropic albedos.
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