Figure 9
From: Retrieving zinc concentrations in topsoil with reflectance spectroscopy at Opencast Coal Mine sites
The distribution plots of important wavelength regions, relative important bands, and the coefficients of optimal PLSR for inferring Zn concentration 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.
