Thermal infrared hot spot and dependence on canopy geometry

For simple homogeneous canopies, we predict canopy thermal infrared hot spot variations of 2°C at the surface with respect to nadir viewing. Dependence on leaf size is weak as long as the ratio of leaf size to canopy height is maintained. However, the angular width of the hot spot increases as the r...

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Bibliographic Details
Published in:Optical Engineering 2001-08, Vol.40 (8), p.1435-1437
Main Authors: Smith, James A, Ballard, Jerrell R
Format: Article
Language:English
Subjects:
brightness temperature
canopy geometry
directional anisotropy
hot spot
remote sensing
thermal infrared
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Summary:For simple homogeneous canopies, we predict canopy thermal infrared hot spot variations of 2°C at the surface with respect to nadir viewing. Dependence on leaf size is weak as long as the ratio of leaf size to canopy height is maintained. However, the angular width of the hot spot increases as the ratio of leaf diameter to canopy height increases. Atmospheric effects minimize but do not eliminate the TIR hot spot at satellite altitudes. ©
ISSN:0091-3286
1560-2303
DOI:10.1117/1.1387990