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Electromagnetic wave extinction within a forested canopyA forested canopy is modeled by a collection of randomly oriented finite-length cylinders shaded by randomly oriented and distributed disk- or needle-shaped leaves. For a plane wave exciting the forested canopy, the extinction coefficient is formulated in terms of the extinction cross sections (ECSs) in the local frame of each forest component and the Eulerian angles of orientation (used to describe the orientation of each component). The ECSs in the local frame for the finite-length cylinders used to model the branches are obtained by using the forward-scattering theorem. ECSs in the local frame for the disk- and needle-shaped leaves are obtained by the summation of the absorption and scattering cross-sections. The behavior of the extinction coefficients with the incidence angle is investigated numerically for both deciduous and coniferous forest. The dependencies of the extinction coefficients on the orientation of the leaves are illustrated numerically.
Document ID
19910031306
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Karam, M. A.
(Texas Univ. Arlington, TX, United States)
Fung, A. K.
(Texas, University Arlington, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
Earth Resources And Remote Sensing
Accession Number
91A15929
Funding Number(s)
CONTRACT_GRANT: NAG5-486
Distribution Limits
Public
Copyright
Other

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