首页 >  2006, Vol. 10, Issue (4) : 537-541

摘要

全文摘要次数: 5500 全文下载次数: 101
引用本文:

DOI:

10.11834/jrs.20060479

收稿日期:

修改日期:

2005-08-25

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植被的微波散射与吸收特征
1.北京师范大学信息科学与技术学院,北京 100875;2.遥感科学国家重点实验室,北京 100875;3.中国科学院遥感应用研究所,北京100101
摘要:

被动微波遥感中大尺度像元内植被种类多种多样并且分布不均匀,较低频率下像元尺度内的植被影响可以根据单个散射体的散射与衰减特性获得。本文讨论了任意朝向的各类植被散射体的计算问题。其中叶片和针叶的散射采用了一般化Rayleigh-Gans计算;杆的散射采用了无限长近似理论。关于各类散射体的衰减,本文比较了散射系数和吸收系数之和,与前向散射定理的结果,并对前向定理的适用性进行了讨论。

The Microwave Scattering and Absorption Characteristics of Vegetation
Abstract:

In passive microwave remote sensing, the vegetation layer within a footprint is of great diversities and anisotropy. Under lower frequencies the vegetation effect could be obtained by statistical average of the scattering and extinction characteristics of single scatter. In this paper the scattering calculation methods of an arbitrary scatter are discussed, where Raleigh-Gans theory is used for disc and needle, and infinite length approximation theory is employed for cylinder. Regarding the extinction of every kind of scatter, the results of the sum of scattering and absorption coefficient, and that from forward scattering theory are compared and discussed.

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