Comparing leaf area index estimates in a Mediterranean forest using field measurements, Landsat 8, and Sentinel-2 data

Ecological Processes

Table 4 R-squared (R²), root mean square error (RMSE), normalized root mean square error (NRMSE), mean absolute error (MAE), and the equation describing the relation

VI	R²	RMSE	NRMSE (%)	MAE	Equation
S-2 LAI	0.49	0.94	15.80	0.79	y = 1.917 + 1.005x
S-2 NDVI	0.49	0.94	15.75	0.78	y = − 2.034 + 8.474x
S-2 NBR	0.52	0.90	15.15	0.70	y = 0.448 + 6.895x
S-2 NDWI	0.50	0.92	15.48	0.72	y = 0.940 + 6.260x
S-2 SR56	0.49	0.94	15.77	0.77	y = 7.714 − 8.861x
S-2 SR57	0.49	0.93	15.65	0.78	y = 7.174 − 9.176x
S-2 SR67	0.34	1.07	18.01	0.89	y = 19.110 − 18.440x
L8 NDVI	0.55	0.88	14.74	0.70	y = 1.564 + 8.281x
L8 NBR	0.53	0.90	15.15	0.70	y = − 2.157 + 9.945x
L8 NDWI	0.52	0.91	15.15	0.72	y = 2.219 − 8.492x