应用二向性反射分布函数进行反照率的精确计算和邻近象元效应校正(英文)

ＣｈｒｉｓｔｏｐｈＣ．Ｂｏｒｅｌ; ＳｉｅｇｆｒｉｅｄＡ．Ｗ．Ｇｅｒｓｔｌ

doi:CNKI:SUN:YGXB.0.1997-S1-029

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应用二向性反射分布函数进行反照率的精确计算和邻近象元效应校正(英文)
Using BRDFs for Accurate Albedo Calculations and Adjacency Effect Corrections
1997年第S1期
纸质出版：1997
DOI： CNKI:SUN:YGXB.0.1997-S1-029
稿件说明：

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[1]ＣｈｒｉｓｔｏｐｈＣ．Ｂｏｒｅｌ,ＳｉｅｇｆｒｉｅｄＡ．Ｗ．Ｇｅｒｓｔｌ.应用二向性反射分布函数进行反照率的精确计算和邻近象元效应校正(英文)[J].遥感学报,1997(S1):200-205. DOI： CNKI:SUN:YGXB.0.1997-S1-029.

Christoph C. Borel, Siegfried A. W. Gerstl. Using BRDFs for Accurate Albedo Calculations and Adjacency Effect Corrections[J]. Journal of Remote Sensing, 1997, (S1). DOI： CNKI:SUN:YGXB.0.1997-S1-029.

摘要

该文讨论二向性反射分布函数（ＢＲＤＦ）在遥感领域中两方面的应用：（１）晴天大气层顶部的反照率的确定，（２）二向性反射分布函数对邻近象元点扩散函数和大气订正的影响。大气层顶部的光谱反照率是从多角度成象光谱辐射计（ＭＩＳＲ）提取的重要参数，其精度主要取决于我们对不同情况表面建立更好的ＢＲＤＦ模型。该文论述一种与９个ＭＩＳＲ二向性反射观测值相匹配的半经验函数的算法，并可进而通过数值积分产生４个光谱波段的晴天大气层顶部的光谱反照率。结果显示反照率的绝对精度对可见光波段可高于１％，对近红外波段可高于２％。采用一种简化的辐射通量模型，我们的工作显示邻近象元点扩散函数（ＰＳＦ）的形状取决于下垫面表面的ＢＲＤＦ。在给定与中心象元的偏移（ｘ，ｙ）的条件下邻近象元的点扩散函数，由和沿观察方向的散射相函数的传输加权的乘积的积分给定。

Abstract

In this paper we will discuss two uses of BRDFs in remote sensing: （1） in determining the clear sky top of the atmosphere （TOA） albedo

（2） in quantifying the effect of the BRDF on the adjacency pointspread function and on atmospheric corrections. The TOA spectral albedo is an important parameter retrieved by the Multiangle Imaging SpectroRadiometer （MISR）. Its accuracy depends mainly on how well we can model the surface BRDF for many different situations. We will present results from an algorithm which matches several semiempirical functions to the nine MISR measured BRFs that are then numerically integrated to yield the clear sky TOA spectral albedo in four spectral channels. We show that absolute accuracies in the albedo of better than 1 % are possible for the visible and better than 2 % in the near infrared channels. Using a simplified extensive radiosity model

we will show that the shape of the adjacency pointspread function （PSF） depends on the underlying surface BRDFs. The adjacency pointspread function at a given offset （x

y） from the center pixel is given by the integral of transmissionweighted products of BRDF and scattering phase function along the line of sight. 