Table 4.

Correlation analysis of the UAV-based spectral features and yield.

	Yield	G/R	G/B	R/B	RGBVI	VARI	ExR	ExG	ExGR	WI	NGRDI	NDYI	GLA
Yield	1
G/R	−0.06	1
G/B	−0.331	0.536 **	1
R/B	−0.36	0.268	0.957 **	1
RGBVI	−0.292	0.704 **	0.974 **	0.870 **	1
VARI	0.216	0.701 **	−0.221	−0.494 *	−0.012	1
ExR	0.241	−0.840**	−0.908 **	−0.747 **	−0.976 **	−0.204	1
ExG	−0.285	0.731 **	0.967 **	0.852 **	0.999 **	0.027	−0.984 **	1
ExGR	−0.215	0.885 **	0.867 **	0.685 **	0.953 **	0.29	−0.996 **	0.965 **	1
WI	0.365	−0.116	−0.889 **	−0.977 **	−0.785 **	0.626 **	0.631 **	−0.758 **	−0.561 **	1
NGRDI	−0.052	1.000 **	0.531 **	0.262	0.700 **	0.705 **	−0.837 **	0.727 **	0.882 **	−0.11	1
NDYI	−0.331	0.538 **	0.998 **	0.954 **	0.977 **	−0.223	−0.908 **	0.968 **	0.868 **	−0.896 **	0.533 **	1
GLA	−0.284	0.730 **	0.966 **	0.852 **	0.999 **	0.025	−0.983 **	1.000 **	0.964 **	−0.761 **	0.726 **	0.969 **	1

Note: ** means a significant level of 0.01.