不同含水量土壤偏振光谱特征定量分析

Quantitative research on spectral polarization characteristics of soil with different water content

水分含量是影响土壤偏振光谱特征的重要参数之一,研究土壤不同水分含量的偏振光谱特征在土壤偏振遥感波段的选择和图像解释上具有重要意义,为应用偏振遥感信息进行土壤调查及理化性质的分析提供依据。本文通过在350—2500 nm波段范围内对不同水分含量的土壤进行偏振光谱测试与分析,研究土壤偏振光谱数据与水分含量之间的关系,建模并检验其精度,对影响土壤偏振光谱特征的各个因素设计科学的正交实验,研究含水量、偏振角度、探测角和方位角等各个因素及其交互作用对土壤偏振光谱特征的影响。结果表明,含水量与偏振角度的交互作用和含水量本身对土壤偏振光谱的影响最大,显著性最强,其次是探测角与含水量的交互作用的影响,而偏振角对土壤偏振光谱有一定的影响,其他因素对土壤光谱偏振反射的影响不大。

Moisture is one of the most important parameters affecting soil polarization spectra, and is critical to soil remote sens- ing band selection and image interpretation. It also provides information required for soil investigation and analysis of physical and chemical properties. In this paper, we tested and analyzed the polarization spectra of soils with different moisture contents in the wavelength range of 350 nm to 2500 nm to study the relationship between soil spectral polarization data and soil moisture, to deter- mine the spectral response and changes in soil moisture, and to establish models of the relationship between spectral data and soil moisture. We also designed an orthogonal test for the various factors that affect soil spectral polarization characteristics, in which we studied soil moisture, polarization angle, detected angle, and azimuth of the various factors and their interactions. The results showed that the most significant factors were soil moisture and the interaction of soil moisture and polarization angle, followed by the interaction between the detected angle and moisture, while the polarization angle had little impact on the soil polarization spec- tra.