Intercomparison of Downscaling Techniques for Satellite Soil Moisture Products

Table 6

Comparison between in situ and downscaled (1 km) ASCAT SM_Polynomial.

	In situ SM		ASCAT SM (1 km)_Polynomial		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	0.26	0.04	y = 0.57x + 16.90	0.40	−0.10	0.11	0.31
Geumsan	0.26	0.02	0.23	0.06	y = 1.25x − 8.837	0.47	0.02	0.07	0.45
Yeongdong	0.22	0.04	0.26	0.06	y = 0.85x + 7.60	0.60	−0.04	0.06	0.65
Imsil	0.26	0.04	0.25	0.05	y = 0.71x + 6.29	0.63	0.00	0.06	0.63
Jeongeup	0.29	0.04	0.21	0.07	y = 1.32x − 17.23	0.82	0.08	0.09	0.56
Jeonju	0.24	0.07	0.22	0.06	y = 0.50x + 9.38	0.55	0.02	0.09	0.60
Wanju	0.17	0.03	0.22	0.07	y = 1.85x − 9.31	0.85	−0.05	0.07	0.64
Sunchang	0.23	0.06	0.23	0.06	y = 0.61x + 8.93	0.68	0.00	0.06	0.77
Hapcheon	0.21	0.09	0.25	0.06	y = 0.84x + 8.10	0.60	−0.12	0.16	0.23
Average	0.23	0.04	0.24	0.06		0.62	−0.02	0.08	0.54

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