transformation of the spectrum can effectively improve the correlation between the spectrum and nickel (Ni) contentThe model effect established by the feature variable selection method based on comprehensive spectralthree-step extraction method and ELM algorithm can effectively retain important bands associated with the Ni contentThe model based on the spectral band selected by the three-step extraction method has better predictionThe research results provide some technical support for monitoring heavy metal content spectrum in local
In order to obtain Pb content in soil quickly and efficiently, a multivariate linear regression (MLR)and a principal component regression (PCR) Pb content estimation model were established on the basismodel established via hyperspectral techniques can achieve largearea, rapid, and efficient soil Pb content