Research Article

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

Table 3

Cumulative contribution rates of the first ten PCs of continuum-removed spectra of the 150 training samples in the eight selected wavelength range in Table 1.

PCPCA (%)GRB-KPCA (σ = 63) (%)

PC150.015062.1243
PC282.811492.8212
PC390.040398.1378
PC493.947698.2543
PC596.697898.3647
PC697.098498.7834
PC797.268899.0579
PC898.369099.1521
PC998.662999.3829
PC1098.909899.9251