. 2022 Jun 11;8(6):e09712. doi: 10.1016/j.heliyon.2022.e09712

Table 6.

Results of the PLSR models of the heavy metal content prediction using the Landsat OLI 8 data and given different preprocessing methods.

Heavy Metal	Treatment	Calibration Set (54 samples)			Validation Set (18 samples)			RPIQ (test-set cal)	VL
Heavy Metal	Treatment	R²cv	RMSECV	RPD	R²	RMSEval	RPD	RPIQ (test-set cal)	VL
Pb (mg/kg)	Reflectance	0.19	8095.7	0.63	0.24	6675.81	1.18	0.84	4
	SNV	0.26	8655.18	0.67	0.13	7139.68	1.11	0.9	2
	MSC	0.32	8328.9	0.74	0.13	7141.94	1.11	1.07	1
Zn (mg/kg)	Reflectance	0.11	19995.28	0.57	0.65	12419.56	1.75	0.67	4
	SNV	0.22	20808.19	0.66	0.53	14403.66	1.51	0.66	2
	MSC	0.24	20679.58	0.66	0.5	14909.09	1.46	0.66	2
Cd (ppm)	Reflectance	0.09	160.47	0.52	0.15	126.28	1.11	0.7	3
	SNV	0.13	163.57	0.52	0.08	131.44	1.07	0.54	2
	MSC	0.14	165.31	0.51	0.09	130.53	1.08	0.53	2