The Effects of Spectral Pretreatments on Chemometric Analyses of Soil Profiles Using Laboratory Imaging Spectroscopy

Table 5

Results for the Luvisol, see Table 4 for details.

		Al	Fe	Mn	C	N
	𝑁	4	4	4	5	5
𝑅	𝑅^2	0.45	0.53	0.45	0.79	0.72
	adj. 𝑅^2	0.42	0.50	0.41	0.77	0.69
	%RMSE	16.2	16.8	39.8	41.9	32.2
	𝑁	5	5	4	5	5
SNV-DT	𝑅^2	0.57	0.49	0.54	0.84	0.71
	adj. 𝑅^2	0.54	0.45	0.51	0.83	0.68
	%RMSE	14.4	17.9	36.2	36.1	32.7
	𝑁	7	7	6	5	5
Diff	𝑅^2	0.65	0.67	0.56	0.81	0.71
	adj. 𝑅^2	0.61	0.63	0.51	0.79	0.69
	%RMSE	13.1	14.2	36.4	40.0	32.6
	𝑁	5	6	5	3	2
2nd Diff	𝑅^2	0.69	0.69	0.59	0.80	0.67
	adj. 𝑅^2	0.67	0.66	0.55	0.79	0.66
	%RMSE	12.2	13.6	34.8	40.4	34.9
	𝑁	3	3	4	2	2
CR	𝑅^2	0.49	0.54	0.47	0.83	0.74
	adj. 𝑅^2	0.47	0.52	0.44	0.82	0.73
	%RMSE	15.6	16.6	38.9	38.1	31.0
	𝑁	2	2	3	2	2
NCR	𝑅^2	0.25	0.26	0.47	0.77	0.67
	adj. 𝑅^2	0.23	0.24	0.45	0.76	0.66
	%RMSE	18.9	21.1	38.9	43.7	35.0
	𝑁	3	3	3	3	4
MSC	𝑅^2	0.45	0.43	0.45	0.83	0.72
	adj. 𝑅^2	0.43	0.40	0.42	0.82	0.70
	%RMSE	16.2	18.5	39.7	37.6	32.2
	𝑁	3	3	3	3	3
EMSC	𝑅^2	0.36	0.34	0.50	0.80	0.68
	adj. 𝑅^2	0.33	0.31	0.47	0.79	0.66
	%RMSE	17.6	20.0	37.8	41.0	34.3