摘要
为研究地物背景的偏振反射特性,综合考虑了镜面反射、体散射和后向散射,建立了一种六参量偏振双向反射分布函数(pBRDF)模型。该模型利用Kubelka-Munk(KM)理论模拟体散射分量,并引入呈高斯分布的后向散射分量,改进了传统的偏振BRDF模型。建立的六参量偏振BRDF模型更加符合地物背景的偏振反射特性。基于多角度偏振测量原理,获得草地和土壤在不同观测几何下的偏振光谱,分析了偏振反射分布特征,并从实测数据中反演了模型参量,将测量值与仿真值进行了对比。结果表明:所建立的六参量偏振BRDF模型的仿真结果与实测数据之间具有很好的吻合性,证实了该模型的准确性与有效性。
To represent the polarized reflectance properties of ground-feature＇s background,we present a sixcomponent polarized bidirectional reflectance distribution function（pBRDF）model that takes specular reflection,volume scattering and backscattering into account.The model uses the Kubelka-Munk（KM）theory to simulate the volume scattering component,and introduces a backscattering component of Gaussian distribution,which improves the traditional pBRDF model,and makes the new six-component pBRDF model more suitable to the polarized reflectance properties of ground-feature＇s background.The polarized spectra of grass and soil under the different observation geometries are obtained based on the theory of multi-angular polarization detection.The variation of the polarized spectral reflectance is also analyzed.The simulated polarization values from the six-component model are compared with the measured data.It is shown that a good agreement is obtained between polarization measurement data and simulated results.The accuracy and validity of model are confirmed.
作者
杨敏
方勇华
吴军
崔方晓
Yang Min;Fang Yonghua;Wu Jun;Cui Fangxiao(School of Environment Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, Anhui 230036, China;Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese AcademyofScience, Hefei, Anhui 230031, China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第5期265-272,共8页
Acta Optica Sinica
基金
国家自然科学基金青年基金(41505020)
关键词
物理光学
偏振
后向散射
双向反射分布函数
地物背景
physical optics
polarization
backscattering
bidirectional reflectance distribution function
groundfeature＇ s background
