Intercomparison of Downscaling Techniques for Satellite Soil Moisture Products

Table 5

Comparison between in situ and original scale (12.5 km) ASCAT SM.

	In situ SM		ASCAT SM (12.5 km)		y = ax + b (x: in situ SM, y: downscaled SM)	R	Bias (m^3·m^−3)	RMSE (m^3·m^−3)	IOA
	Average (m^3·m^−3)	SD (m^3·m^−3)	Average (m^3·m^−3)	SD (m^3·m^−3)
Gokseong	0.16	0.03	0.27	0.05	y = 0.67x + 0.16	0.40	−0.11	0.12	0.29
Geumsan	0.26	0.02	0.24	0.03	y = 0.82x + 0.03	0.59	0.01	0.03	0.72
Yeongdong	0.22	0.04	0.28	0.04	y = 0.61x + 0.14	0.66	−0.06	0.07	0.58
Imsil	0.26	0.04	0.25	0.05	y = 0.77x + 0.04	0.73	0.01	0.03	0.83
Jeongeup	0.29	0.04	0.20	0.07	y = 1.40x − 0.20	0.85	0.09	0.10	0.53
Jeonju	0.24	0.07	0.20	0.07	y = 0.65x + 0.04	0.67	0.04	0.08	0.70
Wanju	0.17	0.03	0.24	0.04	y = 1.21x + 0.03	0.89	−0.07	0.08	0.54
Sunchang	0.23	0.06	0.24	0.05	y = 0.61x + 0.09	0.78	−0.01	0.04	0.86
Hapcheon	0.21	0.09	0.30	0.04	y = 0.40x + 0.20	0.40	−0.15	0.20	0.10
Average	0.23	0.04	0.25	0.05		0.66	−2.92	0.08	0.57

The significance level of the value > 0.05; the significance level of the value > 0.01.