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Hyperspectral Inversion of Heavy Metal Content in Reclaimed Soil from a Mining Wasteland Based on Different Spectral Transformation and Modeling Methods

Hyperspectral Inversion of Heavy Metal Content in Reclaimed ...

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中国煤炭学会土地复垦与生态修复专业委员会第七届学术研讨会暨第二届委员会会议

作者： ShiwenZhang QiangShen ChaojiaNie YuanfangHuang JianhuaWang Qingqing Hu XuejiaoDing Yan Zhou yuanpengchen College of Earth and Environmental Science Anhui University of Science and Technology Faculty of Surveying and Mapping Anhui University of Science and Technology College of Resources and Environmental Sciences China Agricultural University No.1 Engineering Company Ltd.of CCCC First Harbor Engineering Company Lrd Soil remediation center of the Ministry of land and resources of China

The heavy metals(Cr,As,Ni,Cd) in soil surface layer(0-20 cm) were measured by chemical method,and the hyperspectral reflectance data were obtained by *** spectral transformation methods,first-order differential(FDR),second-order differential(SDR),continuum removal(CR) and continuous wavelet transform(CWT),are used for the original spectral *** preprocessing effectively eliminated the noise and baseline drifting and also highlighted the locations of the spectral feature *** least squares regression(PLSR) and radial basis function neural network(RBF) were used to study the hyperspectral inversion of four heavy metals(Cr,As,Ni,Cd).The inversion models of four heavy metals were established in the bands with the highest correlation *** inversion effects were comprehensively evaluated by coefficient of determination(R),root mean square error(RMSE) and residual predictive deviation(RPD) *** results showed that the R valuesof the correlation coefficient were significantly improved after smoothing and spectral transformation when compared to the original *** method combined continuous wavelet transform(CWT)with radial basis function neural network(RBF) demonstrated the best inversion effect on the four heavy metals,and when compared to partial least squares regression(PLSR),the RMSE values were reduced by approximately *** CWT-RBF method can be used as a means of inversion of heavy metals in mining wasteland reclaimed land.

关键词： Heavy metals Reclaimed Soil Mining wasteland

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