Abstract
SUMMARYThe purpose of this study was to determine if the relationship between diurnal surface temperature variations and near-surface soil water content may be used to determine soil water content from airborne measurements. Four flight missions with thermal infra-red and photographic sensors were conducted over an agricultural area in Southern Alberta during clear sky diurnal periods. Soil water content samples expressed in percent of field capacity (PFC), digitized thermal infra-red measurements, apparent temperatures at samples sites, and day minus night temperature differentials ΔTs were obtained. Results confirmed the existence of an inverse linear ΔTs vs PFC relationship under the experimental conditions, with near-surface water content generally the most important ground variable determining ΔTs. The ΔTs vs PFC relationship was not improved by considering diurnal air temperature fluctuations, but did show various degrees of improvement when apparent radiances from the visible spectrum were included.
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