Characterization and Identification of Coal and Carbonaceous Shale Using Visible and Near-Infrared Reflectance Spectroscopy

Figure 10

(a) 3D spatial distribution of the first three PCs of CR spectra of the 150 training samples in the eight regions in Table 1 through GRB-KPCA (σ = 63); (b) process of searching for the optimal penalty parameter c and radial basis function variance parameter γ of GRB-KPCA-SVM model through cross validation with the first ten PCs as input variables.

(a)

(b)