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The most spectral bands used in the PLSR regression for the prediction of heavy metal concentrations (I) Pb, (II) Zn and (III) Cd. The VNIR-SWIR data, which were used are from: (a) ASD field measured spectra, (b) ASD field measured spectra after preprocessing based on the MSC method and (c) ASD field measured spectra after preprocessing based on the SNV method.
