Table 2.

Indices calculated based on the unmanned aerial vehicle (UAV) images in this study.

Vegetation Indices	Reference
GLA = (2 × G−R−B)/(2 ×G + R + B)	[31]
ExR = 1.4R − G	[32]
ExG = 2 × G − R − B	[32]
ExGR = ExG − 1.4R − G	[32]
WI = (G − B)/(R − G)	[33]
NGRDI = (G – R)/(G + R)	[14]
RGBVI = (G × G – R × B)/(G × G + R × B)	[19]
VARI = (G − R)/(G + R − B)	[20]

Note: R represents the average pixel value of the red channel, G represents the average pixel value of the green channel, B refers to the average pixel value of the blue channel, and r, g, and b are the normalized values of R, G, and B.