粗糙地表土壤含水量遥感模型研究

Research on Remote Sensing Model for Soil Water on Rough Surface

土壤粗糙度对地表二向反射率特征有重要影响而且极不稳定 ,是影响土壤含水量遥感精度的一个重要因素。该文分析土壤含水量影响反射率的物理过程 ,论证土壤含水量与土壤光谱的关系服从比尔定律 ;分析土块级土壤粗糙度影响土壤反射率的根本原因是微坡面的倾斜使二次和多次散射的比例增加。在此基础上建立粗糙地表土壤含水量遥感模型 ;

Roughness of soil surface performs a remarkable inference to bi directional reflectance function of ground,and it is a variable.So it's one of the important factor that affect the precision of the remote sensing for soil water content.Though analyzing the physical course of soil surface reflecting under the inference of soil water,this paper demonstrated that the relationship between soil reflected spectrum and the soil water content obeys the Beer Law,and that the essential cause of soil sruface roughness affecting the soil reflectance is the slant of sub slops on clod surface which result in the increasing of the raer of multi reflecting light.Basing on it,a remote sensing mode for soil water remote sensing on rough surface is proposde in this paper.The result of experimental data showed that the model has a satisfied precision.