Table 1.

Vegetation index formula.

Vegetation index	Designation	Formula
NDVI	Normalized difference vegetation index	$\frac{{\rho }_{NIR}-{\rho }_{RED}}{{\rho }_{NIR}+{\rho }_{RED}}$
EVI	Enhanced vegetation index	$2.5(\frac{{\rho }_{NIR}-{\rho }_{RED}}{{\rho }_{NIR}+6{\rho }_{RED}-7.5{\rho }_{BLUE}+1})$
RVI	Ratio vegetation index	$\frac{{\rho }_{NIR}}{{\rho }_{RED}}$
TVI	Transformed vegetation index	$\sqrt{NDVI+0.5}$
GNDVI	Green normalized difference vegetation index	$\frac{{\rho }_{NIR}-{\rho }_{GREEN}}{{\rho }_{NIR}+{\rho }_{GREEN}}$
RDVI	Renormalized difference vegetation index	$\sqrt{NDVI\times RVI}$
SAVI	Soil-adjusted vegetation index	$\frac{1.5({\rho }_{NIR}-{\rho }_{RED})}{({\rho }_{NIR}+{\rho }_{RED}+0.5)}$
MSAVI	Modified soil-adjusted vegetation index	$\frac{2{\rho }_{NIR}+1-\sqrt{2{({\rho }_{NIR}+1)}^2-8({\rho }_{NIR}-{\rho }_{RED})}}{2}$
OSAVI	Optimized soil-adjusted vegetation index	$\frac{{\rho }_{NIR}-{\rho }_{RED}}{{\rho }_{NIR}+{\rho }_{RED}+0.16}$
ARVI	Atmospherically resistant vegetation index	$\frac{{\rho }_{NIR}-{\rho }_{RED}+\theta ({\rho }_{BLUE}-{\rho }_{RED})}{{\rho }_{NIR}+{\rho }_{RED}-\theta ({\rho }_{BLUE}-{\rho }_{RED})}$
IPVI	Infrared percentage vegetation index	$\frac{{\rho }_{NIR}}{{\rho }_{NIR}+{\rho }_{RED}}$