Recent Advances in Modeling the Infrared Temperature of Vegetation Canopies

Remote sensing of substrate moisture and the surface energy balance using surface infrared temperature measurements is much more difficult and complex over vegetation than over bare soil. Unlike those of bare soil, the radiometric temperature of a vegetation canopy is usually close to the air temperature just above the canopy. Leaf temperature does not rise very far above air temperature because the plant makes use of available water from a relatively deep substrate layer (the root zone). Leaf temperature, however, depends not only on water uptake from the root zone but on plant constraints and atmospheric demand. Moreover, radiometric canopy temperature depends on the radiance reaching the detector from bare soil around and beneath the plants.

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