The extinction properties of forest componentsThe effect of each forest component on the extinction of electromagnetic waves is investigated by modeling the branches with finite cylinders, deciduous leaves with elliptic disks, and coniferous leaves with needles. The inner field is estimated by the field inside an infinitely long cylinder of similar properties for the branches, and by the Shifrin approximation for the leaves. For each forest component analytic expressions were derived for the extinction cross section via the forward scattering theorem and for ohmic and scattered losses. For branches, the variation of the extinction cross section obtained via the forward scattering theorem is illustrated numerically as a function of the branch radius and the imaginery part of its dielectric constant. It is compared with the measurements from a single branch. For the leaves, the forward scattering theorem gives value for the extinction cross section equal to the ohmic cross section.
Karam, M. A. (Texas Univ. Arlington, TX, United States)
Fung, A. K. (Texas Univ. Arlington, TX, United States)
Blanchard, A. J. (Texas Univ. Arlington, TX, United States)
Nance, C. E. (Texas Univ. Arlington, TX, United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1988
Publication Information
Publication: ESA, Proceedings of the 1988 International Geoscience and Remote Sensing Symposium (IGARSS) '88 on Remote Sensing: Moving Towards the 21st Century, Volume 2