丁香叶片叶绿素含量偏振高光谱数学模型反演研究

Study on the Modeling of Hyperspectral Polarized Reflection of Clove Lamina with Chlorophyll Content

在测量叶绿素含量的同时,使用二向反射光度计、USB2000高光谱仪和偏振装置,定量测量与计算丁香叶片高光谱偏振信息,并建立偏振信息-叶绿素含量回归模型。结果表明:当0°偏振时,叶绿素的含量与其偏振反射比的回归模型为Y=4.506 4e-0.056 8X,复相关指数R2=0.895 8;90°偏振时,叶绿素的含量与其偏振反射比的回归模型为Y=145.79X-1.204 1,复相关指数为R2=0.479 8;50°入射角时,叶绿素的含量与其偏振度的回归模型为Y=7 206.7X6-20 160X5+22 547X4-12 788X5+3 822.4X2-553.72X+30.429,复相关指数为R2=0.646 4;对以上模型进行F检验,发现模型中的偏振信息和叶绿素含量之间存在显著的函数关系,为植被遥感监测和应用提供了理论基础。

In the present study, the authors detected clove laminas in different states with multi-angle hyperspectral polarized reflections and measured their chlorophyll content at the same time. The authors analyzed hyperspectral polarized reflections of clove laminas from various viewing zenith angles, incidence angles, the relative azimuth angles, polarized states and chlorophyll content. The authors calculated quantitatively clove laminas in different states with multi-angle hyperspectral polarized reflection by USB2000, bidirectional polarized reflectance and polarized equipment, and built the regression models of polarized information-chlorophyll content. The result indicated that when the polarized angle was 0°, the model of chlorophyll content with polarization reflectance was built as Y=4. 506 4e^- 0.0568x （R2 =0. 895 8） ; while as the polarized angle was 90°, the model of chlorophyll content with polarization reflectance was built as Y= 145.79X^-1.204 1 （R^2 =0. 479 8） ; when the incidence angle was 50°, the model of chlorophyll content with degree of polarization was built as Y=7 206.7X^6 -20 160X5 ＋22 547X4 -12 788X%5 ＋3 822. 4X^2 -553. 72X＋30. 429 （R^2 =0. 646 4）. The authors found that a significant functional relationship between the polarized information and chlorophyll content exists. The study provides a theoretical base for vegetation remote sensing.