PARAMETERIZATION OF BI-DIRECTIONAL REFLECTANCES FOR VEGETATION BY USING MULTI-TEMPORAL SPOT IMAGES

In this paper, the parameterization of bi-directional reflectances of vegetation is made possible by using multi-temporal SPOT satellite images. Five SPOT images scanned within two weeks are used. The woods near the Taichung port in central Taiwan are selected. An atmospheric correction model is applied to remove the atmospheric effect of the satellite images. Aerosol optical depth (AOD) is retrieved from dense dark target of the image. The linear bi-directional reflectance model developed by Roujean et al. (1992) is used to parameterization the bi-directional reflectances of woods. The results show that the standard error between simulated reflectance and atmospheric-effect-corrected BRF can be less than 0.01 in all three XS bands. By using this retrieved bi-directional reflectance model of vegetation, the bi-directional effect of vegetation can be reduced.