偏振遥感测量中土壤偏振度随太阳高度角的变化规律初探

Relationship Between Solar Zenith Angle and Degree of Polarization of Soil in Polarized Remote Sensing

偏振是光的一种基本性质。不同地物或同一地物不同状态产生不同的偏振态,且与波长密切相关,因此探测目标地物偏振信息正成为遥感目标识别的新手段。推导了当光倾斜入射到土壤表面时偏振度与太阳高度角之间的函数关系,总结出其中的变化规律。太阳高度角是影响辐照度的主要因素,研究土壤偏振度随太阳高度角的变化规律,可以为土壤偏振遥感解译提供重要参数,对地物的精确识别和反演有重要的现实意义。

Polarization is a basic nature of light. Different state of polarization can be generated by different earth targets or different state of a same earth target, which relates closely to the wavelength, therefore the detection of polarization information of earth target has become a new method of remote sensing target recognition. In this paper, we have inferred the function of solar zenith angles and degree of soil polarization. Solar zenith angle is the primary factor affecting the irradiance, therefore studying the rule of solar zenith angle and degree of soil polarization may provide more important parameters for polarized remote sensing interpretation and help to object precise recognition and inversion.