一种新型城市双向反射模型及其对比研究

摘要

Due to the complex structures and the diverse kinds of land surface coverage,there are great challenges for land surface reflectance calculation and land parameter extraction over the urban areas. In this paper,a new model based on the geometrical optics was presented to calculate the Bi-directional Reflectance Distribution Function (BRDF) over the urban area. The model estimates the BRDF on the basis of the four components (visible sunlit building surface, visible sunlit shaded building surface, visible sunlit background and visible shaded background) calculation. The results were compared to those calculated by the current "street structure model". Evaluation results show that this model has a high precision and a fast speed.%城市地区由于地表结构复杂,地表类型多样,使得利用遥感技术计算该类型区域的地表反射率及提取地表参数时面临较大困难.本文针对以上问题,基于几何光学模型的思想建立了一种新型的城市地区双向反射模型.该模型通过对可视光照建筑面、可视阴影建筑面、可视地表光照面、可视阴影地表4种几何分量的计算来确定城市地区的双向反射率,并且与现有的“街区”模型进行了对比.结果表明,本文提出的城市地区双向反射率模型具有较高的精度和较快的速度.