DocumentCode :
1023345
Title :
Microwave Inversion of Leaf Area and Inclination Angle Distributions from Backscattered Data
Author :
Lang, Roger H. ; Saleh, Hamido A.
Author_Institution :
Department of Electrical Engineering and Computer Science, George Washington University, Washington, DC 20052
Issue :
5
fYear :
1985
Firstpage :
685
Lastpage :
694
Abstract :
The backscattering coefficient from a slab of thin randomly oriented dielectric discs over a flat lossy ground is used to reconstruct the inclination angle and area distributions of the discs. The discs are employed to model a leafy agricultural crop, such as soybeans, in the L-band microwave region of the spectrum. The distorted Born approximation, along with a thin disc approximation, is used to obtain a relationship between the horizontal-like polarized backscattering coefficient and the joint probability density of disc inclination angle and disc radius. Assuming large skin depth reduces the relationship to a linear Fredholm integral equation of the first kind. Due to the ill-posed nature of this equation, a Phillips-Twomey regularization method with a second difference smoothing condition is used to find the inversion. Results are obtained in the presence of 1 and 10 percent noise for both leaf inclination angle and leaf radius densities.
Keywords :
Approximation methods; Backscatter; Crops; Dielectric losses; Integral equations; L-band; Polarization; Scattering; Skin; Slabs;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.1985.289387
Filename :
4072363
Link To Document :
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