Evaluation of Calibration Method for Field Application of UAV-Based Soil Water Content Prediction Equation

Table 1

Coefficient of the water estimation formula using RGB values.

Altitude		20 m	50 m	100 m	150 m
Coefficient	a	−0.339	−0.105	−0.709	−1.187
	b	−0.361	−0.409	−0.027	0.909
	c	0.264	0.061	0.319	−0.026
	d	65.2	66.4	55.3	43.5
R^2		0.96	0.94	0.96	0.47
RMSE (%)		2.21	2.74	2.26	7.87