Research on The Surface Reflectance Model in Satellite Measurement Scale

在这项研究中，我们确定了可见光和红外波段之间的表面反射率比在日本的陆地地区，使用Terra中分辨率成像光谱仪图像和地面测量的气溶胶光学厚度（AOT）。在陆地的BRDF模型方面，利用法国媒体POSTEL公司的POLDER-1数据库，分析了已有的经验BRDF模型，如Li_sparse-Ross_thick模型和Li_sparse-Ross_thick with Hot Spot模型。这些模型包括三个核心组件，即各向同性，几何和体积散射核组件。我们证实，他们能够适合大多数目标类别的测量BRDF值，通过选择适当的系数。由于我们发现遮蔽函数是体散射核分量的一个非常好的候选者，因此应该优先使用而不是经验分量，因为我们可以基于辐射传输理论从理论上导出遮蔽函数。针对陆地目标，提出了Li稀疏阴影BRDF模型，并对多种实测BRDF目标进行了验证;针对海面BRDF，在分析太阳闪烁POLDER图像的基础上，提出了Cox-Munk模型中风速和海面坡度的新参数。

In this study, we determined the surface reflectance ratios between visible and infrared bands for land areas in Japan, using Terra MODIS images and the ground-measured aerosol optical thickness(AOT). We obtained a satisfactory agreement between the satellite-retrieved and ground-retrieved AOT, using the newly determined reflectance ratios.As for the BRDF models for lands, we analyzed the previously proposed empirical BRDF models, such as the Li_sparse-Ross_thick model and Li_sparse-Ross_thick with Hot Spot model, using the BRDF Database derived from POLDER-1 by POSTEL, Medias France. These models consist of three kernet components, namely, an isotropic, a geometric and a volume scattering kernel components. We confirmed they are able to fit the measured BRDF values for most target categories, by choosing appropriate coefficients. Since we found the shadowing function is a very good candidate for a volume scattering kernel component, it should prefer to use, instead of empirical component, because we can derive the shadowing function theoretically, based on the radiative transfer theory. We proposed the Li-sparse-shadowing BRDF model for land target and the proposed model was tested successfully for various measured BRDF targets.As for the sea surface BRDF, we proposed new parameters for the wind speed and surface slope in the Cox-Munk model, based on the analysis of the sun glitter POLDER images.