Prediction of Soil Available Boron Content in Visible-Near-Infrared Hyperspectral Based on Different Preprocessing Transformations and Characteristic Wavelengths Modeling

Table 8

Result of SG + SNV + DT/PLS_RBF models.

Variable selection method	No. of variables	Calibration sets				Test sets
			RMSE	RPD	RPIQ		RMSE	RPD	RPIQ
Full wavelengths	1306	0.988	0.009	8.963	4.800	0.810	0.043	3.217	2.126
RFA	367	0.690	0.476	1.803	0.985	0.819	0.376	2.370	1.064
SPA	3	0.542	0.578	1.483	0.810	0.782	0.412	2.159	0.969
VIP	367	0.690	0.476	1.803	0.985	0.819	0.376	2.370	1.064