Figure 7
From: Retrieving zinc concentrations in topsoil with reflectance spectroscopy at Opencast Coal Mine sites
The scatter plots for determining the lowest RMSECV and the corresponding number of LVs. The number of LVs with the lowest RMSECV was used to fit the optimal PLSR in estimating Zn concentrations at four conditions concerning the (a) entire group based on L6, (b) clean group based on L3, (c) low pollution group based on L5, and (d) moderate pollution group based on L1.
