Table 4.

Statistical metrics of comparison between measured (closed) and modeled ET (mm day⁻¹) obtained from both Landsat-only and Landsat + ECOSTRESS + VIIRS_I/S2 fusion at daily and weekly timesteps over the 3-year study period

Domain	Tower	Timescale	N	Landsat-only				Landsat + ECO + VIIRSI/S2
				MAE	RMSE	MBE	%RE	MAE	RMSE	MBE	%RE
Lodi	SLM001	Daily	722	0.52	0.69	0.24	20.6	0.55	0.75	0.29	21.8
		Weekly	90	0.44	0.56	0.26	16.6	0.49	0.63	0.32	18.2
	SLM002	Daily	618	0.60	0.80	0.26	22.1	0.69	0.94	0.41	25.1
		Weekly	76	0.54	0.72	0.26	18.6	0.62	0.87	0.43	21.1
	USBi1	Daily	1044	1.19	1.42	− 0.77	37.5	1.08	1.29	− 0.69	34.2
		Weekly	146	1.07	1.21	− 0.75	33.3	0.95	1.07	− 0.67	29.8
	USBi2	Daily	985	1.27	1.64	− 0.73	40.8	1.27	1.62	− 0.77	40.8
		Weekly	136	1.18	1.50	− 0.74	37.0	1.18	1.47	− 0.78	37.1
Cloverdale	BAR012	Daily	653	0.59	0.78	0	24.1	0.57	0.75	0.06	23.6
		Weekly	76	0.51	0.63	0	20.0	0.47	0.57	0.06	18.3
Madera	RIP760	Daily	521	0.67	0.87	− 0.20	14.7	0.67	0.87	− 0.10	14.8
		Weekly	67	0.50	0.63	− 0.16	10.5	0.49	0.63	− 0.05	10.2
All	All sites	Daily	4543	0.87	1.18	− 0.28	28.7	0.86	1.15	− 0.23	28.4
		Weekly	591	0.79	1.05	− 0.30	25.0	0.78	1.01	− 0.24	24.4