测绘通报 ›› 2022, Vol. 0 ›› Issue (1): 44-49.doi: 10.13474/j.cnki.11-2246.2022.0008

• 学术研究 • 上一篇    下一篇

基于集合经验模态分解的土壤重金属Cd定量反演

郭云开1,2, 曹骁1,2, 谢晓峰1,2, 张思爱1,2, 谢琼3,4   

  1. 1. 长沙理工大学交通运输工程学院, 湖南 长沙 410076;
    2. 长沙理工大学测绘遥感应用技术研究所, 湖南 长沙 410076;
    3. 湖南工程职业技术学院测绘地理学院, 湖南 长沙 410151;
    4. 长沙理工大学 公路地质灾害预警空间信息技术湖南省工程实验室, 湖南 长沙 410114
  • 收稿日期:2021-01-05 发布日期:2022-02-22
  • 通讯作者: 曹骁。E-mail:471365176@qq.com
  • 作者简介:郭云开(1958-),男,博士,教授,研究方向为路域植被生态环境遥感。E-mail:guoyunkai226@126.com
  • 基金资助:
    国家自然科学基金(41671498;41471421);长沙理工大学公路地质灾变预警空间信息技术湖南省工程实验室开放基金(kfj190603)

Quantitative inversion of soil heavy metal Cd based on ensemble empirical mode decomposition

GUO Yunkai1,2, CAO Xiao1,2, XIE Xiaofeng1,2, ZHANG Siai1,2, XIE Qiong3,4   

  1. 1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410076, China;
    2. Institute of Surveying and Mapping Remote Sensing Applied Technology, Changsha University of Science and Technology, Changsha 410076, China;
    3. Department of Surveying and Mapping Geography, Hunan Vocational College Engineering, Changsha 410151, China;
    4. Engineering Laboratory of Spatial Information Technology of Highway Geological Disaster Early Warning, Changsha University of Science and Technology, Changsha 410114, China
  • Received:2021-01-05 Published:2022-02-22

摘要: 针对高光谱定量反演土壤重金属含量的模型精度不足的问题,本文从时频空间的角度引入时频分析法——集合经验模态分解(EEMD)。采用EEMD法分解土壤高光谱,获得不同频率的本征模态(IMF)分量,通过分析IMF分量与重金属含量的相关性,提取特征光谱,构建EEMD-SVM定量反演模型。研究结果表明,通过EEMD法分解土壤光谱,可有效地提取土壤光谱中的微弱信息;构建EEMD-SVM模型可较好地反演土壤重金属Cd含量,模型的决定系数R2为0.920 3,明显高于基于一阶微分处理光谱数据后构建的SVM模型的R2(0.786 6)。即说明在土壤重金属定量反演领域,EEMD可作为一种新的光谱处理方法。

关键词: EEMD, 高光谱, 土壤重金属, 支持向量机

Abstract: In view of the lack of accuracy of the model for hyperspectral quantitative inversion of soil heavy metal content, this paper introduces the time-frequency analysis method seting ensemble empirical mode decomposition(EEMD) from the perspective of time-frequency space, and explores the application of EEMD method in hyperspectral quantitative inversion of soil heavy metal content.The EEMD method is used to decompose soil hyperspectral to obtain intrinsic mode function (IMF) components with different frequencies. By analyzing the correlation between IMF components and heavy metal content, characteristic spectra are extracted to construct an EEMD-SVM quantitative inversion model.The results show that the EEMD method can effectively extract the weak information in the soil spectrum.The determination coefficient R2 of the EEMD-SVM model is 0.920 3, which is significantly higher than that of the SVM model based on the first-order differential processing of spectral data (0.786 6).It is explained that EEMD can be used as a new method of spectral treatment in the field of quantitative introspection of soil heavy metals.

Key words: EEMD, high optical spectrum, soil heavy metal, support vector machine

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