植被偏振特性在叶片水分含量反演中的作用

The Role of Vegetation Polarization Characteristics in Leaf Moisture Content Inversion

植被叶片表面的性质和结构会影响反射回波的偏振状态,因此反射回波包含偏振信息。为了探究植被水分含量反演对反射回波偏振程度的影响,利用课题组自主研制的高光谱激光雷达,对不同生长状态的植被叶片反射回波进行偏振测量,分析植被叶片反射回波的偏振特性,计算偏振衡量因子,并将其与叶片含水量进行相关性分析。结果表明,植被叶片含水量与反射回波偏振度呈正相关关系;研究同时说明偏振度不受波长影响,且在总反射辐射中偏振辐射占比较小。本研究分析了叶片的偏振特性,并证明了偏振信息在叶片含水量反演中具有重要意义。

The nature and structure of the leaf surface of vegetation affects the polarization state of the reflected echo,so the reflected echo contains polarization information.In order to explore the influence of vegetation moisture content inversion on the polarization degree of reflected echoes,uses the hyperspectral lidar independently developed by our research group to polarize the reflected echoes of vegetation leaves in different growth states,calculate the polarization measurement factors,analyze the polarization characteristics of the reflected echoes of vegetation leaves,and analyze them in correlation with leaf water content.The results show that the water content of vegetation leaves is positively correlated with the polarization degree of reflected echo.At the same time,the study shows that the polarization degree is not affected by wavelength,and the polarization radiation accounts for a relatively small proportion of the total reflection intensity.In this study,the polarization characteristics of blades were analyzed,and it was proved that polarization information is of great significance in leaf water content inversion.