Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Characterization of forest opacity using mulit-angular emission and backscatter data

item Kurum, Mehmet
item O'neill, Peggy
item Lang, Roger
item Joseph, Alicia
item Cosh, Michael
item Jackson, Thomas

Submitted to: International Geoscience and Remote Sensing Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 8/11/2010
Publication Date: 10/22/2010
Citation: Kurum, M., O'Neill, P.E., Lang, R.H., Joseph, A.T., Cosh, M.H., Jackson, T.J. 2010. Characterization of forest opacity using mulit-angular emission and backscatter data. In: Proceedings of the International Geoscience and Remote Sensing Symposium, July 25-30, 2010, Honolulu, Hawaii. III:2051-2054.

Interpretive Summary:

Technical Abstract: This paper discusses the results from a series of field experiments using ground-based L-band microwave active/passive sensors. Three independent approaches are employed to the microwave data to determine vegetation opacity of coniferous trees. First, a zero-order radiative transfer model is fitted to multi-angular microwave emissivity data in a least-square sense to provide “effective” vegetation optical depth. Second, a ratio between radar backscatter measurements with the corner reflector under trees and in an open area is calculated to obtain “measured” tree propagation characteristics. Finally, the “theoretical” propagation constant is determined by forward scattering theorem using detailed measurements of size/angle distributions and dielectric constants of the tree constituents (trunk, branches, and needles). The results indicate that “effective” values underestimate attenuation values compared to both “theoretical” and “measured” values.

Last Modified: 06/23/2017
Footer Content Back to Top of Page