ANFIS在植被叶绿素含量高光谱反演中的应用  

Application of ANFIS in in-situ Measured Hyperspectral Data for Vegetation Chlorophyll Content Estimation

作　　者：姚付启[1,2] 张振华[1] 杨润亚[3] 孙金伟[1] 王海江[1] 任尚岗[1] 

机构地区：[1]鲁东大学地理与规划学院,山东烟台264025 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [3]鲁东大学生命科学学院,山东烟台264025

出　　处：《光谱学与光谱分析》2010年第7期1834-1838,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50609022);山东省教育厅项目(J07YF16);鲁东大学创新团队建设项目资助

摘　　要：利用ASD便携式野外光谱仪和SPAD-502叶绿素计实测了落叶阔叶树法国梧桐、毛白杨叶片的高光谱反射率与叶片绿度,建立了10个常见植被指数叶绿素含量估算模型,并采用相关系数较大波段作为BP人工神经网络模型(ANN-BP)的输入变量进行了叶绿素含量的估算,将自适应神经模糊推理系统(ANFIS)应用到植被叶绿素含量高光谱反演中。结果表明:10个常见植被指数中归一化植被指数可以较为精确反演叶绿素含量,法国梧桐、毛白杨归一化植被指数回归模型确定性系数R2分别为0.795 7和0.754 6,法国梧桐、毛白杨ANN-BP预测值与实测值之间的线性回归的确定性系数R2分别为0.935 2和0.917 1,ANFIS可以大大提高反演精度,法国梧桐、毛白杨预测值与实测值之间的线性回归的确定性系数R2分别为0.9998和0.995 6,是一种良好的植被叶绿素含量高光谱反演模式。Hyperspectral reflectance and green degree of Platanus orientalis L. and Populus tomentosa Carr. leaves were measured by the ASD portable spectrometer and the portable chlorophyll meter SPAD-502, respectively. The chlorophyll concentration retrieval models based on 10 common vegetation indexes were established, and the ANN-BP model which used wave bands with larger correlation coefficient as input variables was established for chIorophyll content estimation. Finally, the ANFIS model was established to inverse vegetation chlorophyll content using hyperspectral data. The results showed that normalized difference vegetation index can inverse chlorophyll content better than other vegetation index, and the determination coefficients R2 of models of Platanus orientalis L. and Populus tomentosa Carr. were 0. 795 7 and 0. 754 6, respectively. The determination coefficients Rz between the predicted and the measured chlorophyll content based on ANN-BP models of Platanus orientalis L. and Populus tomentosa Cart. were 0. 935 2 and 0. 917 1, respectively. ANFIS model which is a good method to be applied to hyperspectral data for estimation of vegetation chlorophyll concentration can greatly improve vegetation chlorophyll concentration estimation accuracy, and the determination coefficients R2 between the predicted and the measured chlorophyll content of Platanus orientalis L. and Populus tomentosa Cart. were 0. 935 2 and 0. 917 1, respectively.

关 键 词：高光谱 叶绿素含量 植被指数 ANN-BP ANFIS 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] Q945.1[自动化与计算机技术—控制科学与工程]