DocumentCode :
2320167
Title :
A numerical study of thermal emission from random dielectric rough surfaces with the SMCG/PBTG method
Author :
Zhou, Lin ; Li, Qin ; Tsang, Leung ; Chen, K.S.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Volume :
2
fYear :
2000
fDate :
2000
Firstpage :
932
Abstract :
The 3-dimensional simulations of emissivities from a two-dimensional wet soil with random rough surfaces are studied with numerical solutions of Maxwell equations. The wet soils have large permittivity. Thus a dense discretization of the surface is required to implement the method of moment (MoM) for the surface integral equations. Such a dense discretization is also required to ensure that the emissivity can be calculated to the required accuracy of 0.01 for passive remote sensing applications. It has been shown that the physics-based two-grid method (PBTG) can efficiently compute the accurate surface fields on the dense grid. In this paper, the numerical results are calculated by using the PBTG in conjunction with the sparse-matrix canonical grid method (SMCG). The emissivities are illustrated for random rough surfaces and physical parameters of roughness for different soil moisture conditions. The results are calculated for L and C bands using the same physical roughness parameters. The numerical solutions of Maxwell´s equations are also compared with the popular H and Q empirical model showing that H and Q are dependent on soil moisture, vary angle and frequency
Keywords :
Maxwell equations; geophysical techniques; hydrological techniques; moisture measurement; radiometry; remote sensing; rough surfaces; soil; terrain mapping; C-band; L-band; Maxwell equations; PBTG method; SHF; SMCG; UHF; dense discretization; emissivity; geophysical measurement technique; hydrology; land surface; large permittivity; method of moment; microwave radiometry; numerical model; physics-based two-grid method; random dielectric rough surface; random rough surface; remote sensing; soil moisture; sparse-matrix canonical grid method; surface integral equations; terrain mapping; thermal emission; three dimensional simulation; two-dimensional wet soil; wet soil; Dielectrics; Grid computing; Integral equations; Maxwell equations; Moment methods; Permittivity; Remote sensing; Rough surfaces; Soil moisture; Surface roughness;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2000. Proceedings. IGARSS 2000. IEEE 2000 International
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-6359-0
Type :
conf
DOI :
10.1109/IGARSS.2000.861748
Filename :
861748
Link To Document :
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