Based on the Gaussian Fitting Method to Derive Daily Evapotranspiration from Remotely Sensed Instantaneous Evapotranspiration

Table 2

Gaussian fitting results on ET measurements at EC4 on cloud-free days in June 2012.

Date	Fitting equation	R^2	RMSE (W/m^2)
June 7	ETfit = 3.81 + 216.4 ∗ exp(−0.044 ∗ (i − 13.6)^2)	0.90	7
June 8	ETfit = −2.9 + 162.5 ∗ exp(−0.034 ∗ (i − 13.7)^2)	0.85	8
June 9	ETfit = −4.48 + 158.7 ∗ exp(−0.038 ∗ (i − 14.52)^2)	0.87	6.5
June 11	ETfit = 5.9 + 156.6 ∗ exp(−0.043 ∗ (i − 14.67)^2)	0.92	4.5
June 15	ETfit = 0.1 + 148.8 ∗ exp(−0.041 ∗ (i − 14.20)^2)	0.91	4.6
June 16	ETfit = 0.7 + 153.4 ∗ exp(−0.037 ∗ (i − 14.39)^2)	0.89	5.69
June 19	ETfit = −2.9 + 165 ∗ exp(−0.038 ∗ (i − 14.30)^2)	0.87	7
June 20	ETfit = 10.56 + 136.2 ∗ exp(−0.037 ∗ (i − 14.06)^2)	0.97	5.8
June 21	ETfit = 4.85 + 144.8 ∗ exp(−0.041 ∗ (i − 14.17)^2)	0.87	5.7
June 24	ETfit = 1.88 + 193 ∗ exp(−0.045 ∗ (i − 15.01)^2)	0.84	7.9
June 29	ETfit = 4.5 + 255.2 ∗ exp(−0.036 ∗ (i − 14.18)^2)	0.94	7.3
June 30	ETfit = 6.6 + 204.4 ∗ exp(−0.037 ∗ (i − 14.90)^2)	0.86	8.7