The BRDFs of Land Surfaces Estimated from the Airborne POLDER Data

Y. Kawata

doi:CNKI:SUN:YGXB.0.1997-S1-004

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The BRDFs of Land Surfaces Estimated from the Airborne POLDER Data
Issue S1, (1997)
Published：1997
DOI： CNKI:SUN:YGXB.0.1997-S1-004
稿件说明：

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[1]Ｙ．Ｋａｗａｔａ,Ｋ．Ｔａｋｅｍａｔａ,Ｔ．Ｙｏｎｅｋｕｒａ.通过航空POLDER数据估计地表二向性反射分布函数(英文)[J].遥感学报,1997(S1):26-32. DOI： CNKI:SUN:YGXB.0.1997-S1-004.

Y. Kawata. The BRDFs of Land Surfaces Estimated from the Airborne POLDER Data[J]. Journal of Remote Sensing, 1997, (S1). DOI： CNKI:SUN:YGXB.0.1997-S1-004.

摘要

研究中，通过选择目标区的ＰＯＬＤＥＲ图象数据来估计目标的二向性反射分布函数，其主要结果可简述如下：１）我们发展了一种大气纠正算法，它适用于源自ＰＯＬＤＥＲ传感器的图象数据格式。通过这种算法，将连续的不同视角的ＰＯＬＤＥＲ陆地图象转化为一系列表面反照率图象，该过程考虑了多次散射。２）然后，选定２１个目标区，包括河流、水塘、城市、道路、森林等，其光谱二向性反射分布函数通过连续的反照率图象来估计。研究发现，水表面的二向性反射分布函数５５０ｎｍ，６５０ｎｍ，８５０ｎｍ处呈现朗伯体特征，同时发现有植被覆盖地表的二向性反射分布函数在５５０ｎｍ和６５０ｎｍ处大致为各向同性，而在８５０ｎｍ处则表现为各向异性。该文给出了所有靶区按经验二向性反射分布函数的拟合参数值。

Abstract

In this study

the estimation of the Bidirectional Reflectance Distribution Functions （BRDFs） for selected land cover types was made by using the airborne POLDER image data. The main results in this study can be summarized as follows:（1） We presented an specially improved atmospheric correction algorithm

applicable to a framed image data by the POLDER sensor. The terrestrial images measured successively by the airborne POLDER with a different viewing angle were converted to a series of surface albedo images by our atmospheric correction method

in which the multiple scattering were taken into account for.（2） Then

the spectral BRDFs for selected 21target areas

including the cover types of River

Pond

City

Road

Forest were estimated from using successive albedo images. It was found that the BRDF for water surfaces follow a Lambertian law at both 550nm

650nm and at 850nm. It was also found that the BRDFs for vegetated surfaces are more or less isotropic at 550nm and 650nm

but they are anisotropic at 850nm. The fitting parameters of the empirical BRDF law for all of target surfaces were presented.