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通过分析偏振二向反射分布函数(BRDF)与实验探测角、波长间的关系,提出偏振度分量的多项式模型来定量化描述偏振度分量;强度分量采用现有的半经验模型,在可见光范围内(400～720nm)实现偏振光谱BRDF建模,并将模型输出的结果和实验测量值进行分析比较。结果表明,对于土壤等各向性质较为均匀的背景,采用本文模型能较好地达到精度要求,因而可以将有限实验观测条件下测量得到的少数偏振光谱BRDF扩展到2π空间范围内,得到任意入射及观测条件下的偏振光谱BRDF值,且具有简单、计算量小等优点。
By analyzing the relationship between the BRDF and experimental detection angle and wavelength, a polynomial model of polarization degree is proposed to quantitatively describe the polarization degree component. The intensity component is based on the existing semi-empirical model and can be used in the visible range (400 ~ 720nm) to achieve polarization spectrum BRDF modeling, and the results of the model output and experimental measurements were analyzed and compared. The results show that the accuracy of the proposed model can be well satisfied for the soil with uniform isotropic background. Therefore, a small number of BRDFs measured under the limited experimental conditions can be extended to the 2π space, and any incident And BRDF values under the observation conditions, and has the advantages of simplicity, small calculation amount and the like.