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

Table 5

Level A RPD levels of regression models with various pretreatment transformations.

Pretreatment methods	Regression algorithms
DT	Elastic net, BPNN, SVM_Linear, SVM_RBF, SVM_Sigmoid, PLS_Linear, PLS_RBF, and PLS_Sigmoid
LG + SD	PLS_Linear
LG	Ridge, BPNN, SVM_Linear, SVM_RBF, SVM_Sigmoid, PLS_Linear, PLS_RBF, and PLS_Sigmoid
MC	Ridge, BPNN, SVM_Linear, SVM_RBF, SVM_Sigmoid, PLS_Linear, PLS_RBF, and PLS_Sigmoid
MSC	BPNN, SVM_RBF, PLS_RBF, PLS_Sigmoid
RS	Ridge, SVM_Linear, SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SNV	SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SNV_DT	SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG + LG + FD	Ridge, SVM_RBF, SVM_Sigmoid, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG + LG	Elastic net, ridge, SVM_Linear, SVM_RBF, SVM_Sigmoid, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG	Lasso, ridge, BPNN, SVM_Linear, SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG_DT	Ridge, BPNN, SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG_FD	PLS_RBF and PLS_Sigmoid
SG_MC	Lasso, ridge, SVM_Linear, SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG_MSC	BPNN, SVM_RBF, PLS_RBF, and PLS_Sigmoid
SG_MSC_FD	PLS_Linear
SG_SNV	Elastic net, lasso, SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG_SNV_DT	SVM_RBF, PLS_Linear, PLS_RBF, and PLS_Sigmoid
SG_SNV_FD	PLS_RBF