Predicting Soil Organic Carbon Content Using Hyperspectral Remote Sensing in a Degraded Mountain Landscape in Lesotho

Table 2

Position of key wavelengths selected by both the VIP algorithm and the recursive feature selection method for all combinations of models.

		VIP (PLSR)				RF
Wavelength (nm)	Possible assignment	Lab		Field		Lab		Field
		Raw	FD	Raw	FD	Raw	FD	Raw	FD
2200–2450	Comb C-H stret	—	—	—	—	+	—	—	—
2000–2200	Comb N-H stret, comb O-stret	++	—	—	—	+	+	—	+
1790–1960	Water	+	+	+	+	+	—	+	—
1650–1780	1st overt C-H stret	+	—	++	—	—	—	+	—
1400–1500	1st overt N-H stret and O-H stret	++	—	++	—	—	—	++	—
1300–1420	Comb C-H stret	+	—	—	—	+	—	+	—
1350–1460	Water	+	—	++	+	—	—	—	+
1100–1225	2nd overt C-H stret	+	—	+	—	+	++	+	+
950–1100	2nd overt N-H stret and O-H stret	—	—	—	+	+	+	+	+
850–950	3rd overt C-H stret	+	—	+	+	++	+	++	+
775–850	3rd overt N-H stret	+	—	+	+	++	+	+	+
400–700	Mineral (Fe oxides)	—	+++	+	+++	+++	+++	+++	+++