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Estimation of Land Surface Bidirectional Reflectance Distribution Function by Using Airborne POLDER Image Data
Kazuya TAKEMATA Yoshiyuki KAWATA
IEICE TRANSACTIONS on Communications
Publication Date: 1995/12/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Satellite Remote Sensing)
remote sensing, POLDER, atmospheric correction, multiple scattering, bidirectional reflectance distribution function (BRDF),
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The Bidirectional Reflectance Distribution Function (BRDF) is an intrinsic measurement of directional properties of the earth's surface. However, the estimation of the BRDF requires many remote sensing measurements of a given surface target from different viewing angles. In addition, a good atmospheric correction scheme is a prerequisite for such an attempt. The airborne POLDER sensor measures successively reflected radiation by terrestrial surfaces in a framed image form at different viewing angles during a single airplane pass, like taking snap-shot pictures. A specially improved atmospheric correction algorithm which is applicable to a framed image data by POLDER sensor is presented. The observed reflectance images taken successively by the airborne POLDER at slightly different viewing angles are converted to a series of surface albedo images by applying our atmospheric correction algorithm. Then, the BRDFs for three surface covers, namely, "River Water," "Forest," and "Rice Field," are estimated by using successive albedo images. It is found that the BRDF for "River Water" follows Lambert law at both 550nm and 850nm. It is also found that the BRDFs for "Forest" and "Rice Field" follow Lambert's law at 550nm, but they follow an anisotropic reflection law at 850nm and fitting parameters for their BRDFs are presented.