Table 5 Comparison of retrieval accuracy for soil heavy metal train and test sets.

Element	R²					RPD					RMSE					MAE
Element	MLR	PLSR	SVM	BP	CNN	MLR	PLSR	SVM	BP	CNN	MLR	PLSR	SVM	BP	CNN	MLR	PLSR	SVM	BP	CNN
As	0.687	0.686	0.708	0.720	0.740	1.804	1.801	1.868	1.908	1.980	4.123	4.129	3.981	3.899	3.756	3.459	3.466	3.191	3.134	3.001
Cd	0.566	0.544	0.596	0.632	0.651	1.533	1.497	1.588	1.663	1.709	0.148	0.151	0.143	0.136	0.133	0.119	0.126	0.111	0.105	0.102
Cr	0.371	0.400	0.310	0.307	0.300	1.273	1.304	1.216	1.213	1.207	6.936	6.774	7.266	7.282	7.319	5.526	5.449	5.689	5.897	5.880
Cu	0.381	0.284	0.322	0.300	0.212	1.283	1.193	1.226	1.206	1.137	4.617	4.965	4.593	4.911	5.210	3.312	3.582	3.552	3.609	3.869
Hg	0.528	0.511	0.473	0.509	0.463	1.470	1.444	1.391	1.441	1.378	0.026	0.026	0.027	0.026	0.027	0.021	0.022	0.021	0.021	0.022
Ni	0.649	0.660	0.640	0.526	0.639	1.703	1.732	1.683	1.466	1.679	3.571	3.511	3.256	4.147	3.622	2.983	2.903	2.555	3.316	3.006
Pb	0.755	0.764	0.680	0.801	0.791	2.042	2.078	1.785	2.263	2.204	7.521	7.390	8.605	6.785	6.968	5.741	5.741	6.728	5.474	5.423
Zn	0.639	0.642	0.511	0.609	0.564	1.681	1.687	1.443	1.615	1.529	14.61	14.56	17.02	15.21	16.07	11.36	11.31	12.80	11.62	12.57

Quick links

Search