Table 2 All the forage nutrient estimation models based on the spectral bands of the Tiangong-2 MWI

From: Mapping the forage nitrogen, phosphorus, and potassium contents of alpine grasslands by integrating Sentinel-2 and Tiangong-2 data

TG-2	N						P						K
	RF			SVM			RF			SVM			RF			SVM
	TG	TG-RFFS	TG-LASSO	TG	TG-RFFS	TG-LASSO	TG	TG-RFFS	TG-LASSO	TG	TG-RFFS	TG-LASSO	TG	TG-RFFS	TG-LASSO	TG	TG-RFFS	TG-LASSO
Number	14	6	5	14	6	5	14	4	3	14	4	3	14	8	2	14	8	2
R²	0.76	0.73	0.75	0.67	0.68	0.68	0.73	0.70	0.69	0.61	0.60	0.54	0.81	0.81	0.79	0.77	0.74	0.74
RMSE (%)	0.30	0.30	0.30	0.34	0.33	0.33	0.03	0.03	0.03	0.04	0.04	0.04	0.38	0.39	0.39	0.42	0.44	0.45
NRMSE	0.20	0.21	0.20	0.23	0.23	0.23	0.27	0.28	0.28	0.32	0.36	0.33	0.27	0.28	0.28	0.30	0.32	0.32
RPD	1.56	1.59	1.65	1.62	1.65	1.66	1.48	1.54	1.49	1.44	1.28	1.38	1.69	1.74	1.85	1.77	1.72	1.73
AIC	− 155.68	− 175.42	− 184.12	− 162.64	− 182.23	− 184.66	− 565.1	− 592.53	− 589.5	− 560.73	− 574.73	− 558.97	− 103.92	− 121.53	− 145.33	− 112.02	− 119.1	− 132.51
BIC	− 120.38	− 160.29	− 175.51	− 127.34	− 167.1	− 172.05	− 529.8	− 582.45	− 581.94	− 525.42	− 567.17	− 548.89	− 68.61	− 101.36	− 140.29	− 76.72	− 98.93	− 127.47

The values of R², RMSE, NRMSE, RPD, AIC, and BIC are the averages of 50 cycles of a tenfold CV. The R² value is provided by the validation dataset. The number refers to the number of spectral bands used for modeling. TG-LASSO and TG-RFFS denote the set of suitable MWI spectral bands screened based on the LASSO and RFFS algorithms, respectively. N nitrogen, P phosphorus, K potassium, TG Tiangong-2)

Back to article page

ISSN: 1746-4811

Contact us

Submission enquiries: journalsubmissions@springernature.com