Table 1.

Conventional spectral indices used to estimate vine water status of different cultivars of vitis vinifera.

Index	Formula	R2	Reference	Cultivars
GI	$\frac{{\mathrm{R}}_{550}}{{\mathrm{R}}_{670}}$	0.54	[28]	Vitis vinífera L. cv tempranillo
GNDVI	$\frac{{\mathrm{R}}_{800}-{\mathrm{R}}_{550}}{{\mathrm{R}}_{800}+{\mathrm{R}}_{550}}$	0.58	[28]	Vitis vinífera L. cv tempranillo
MCARI	$\left[\left({\mathrm{R}}_{700}-{\mathrm{R}}_{670}\right)-0.2\times \left({\mathrm{R}}_{700}-{\mathrm{R}}_{550}\right)\right]\times \left(\frac{{\mathrm{R}}_{700}}{{\mathrm{R}}_{670}}\right)$	0.01	[28]	Vitis vinífera L. cv tempranillo
MCARI1	$1.2\times \left[2.5\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{670}\right)-1.3\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{550}\right)\right]$	0.21	[28]	Vitis vinífera L. cv tempranillo
MCARI2	$\frac{1.2\times \left[2.5\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{670}\right)-1.3\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{550}\right)\right]}{\sqrt{{\left(2\times {\mathrm{R}}_{800}+1\right)}^2}-6\times \left({\mathrm{R}}_{800}-5\times {\mathrm{R}}_{670}\right)-0.5}$	<0.01	[28]	Vitis vinífera L. cv tempranillo
MSAVI	$\frac{\left(2\times {\mathrm{R}}_{800}+1-\sqrt{{\left(2\times {\mathrm{R}}_{800}+1\right)}^2-8\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{670}\right)}\right)}{2}$	0.11	[28]	Vitis vinífera L. cv tempranillo
MSR	$\frac{\left(\frac{{\mathrm{R}}_{800}}{{\mathrm{R}}_{670}}\right)-1}{\sqrt{\left(\frac{{\mathrm{R}}_{800}}{{\mathrm{R}}_{670}}\right)+1}}$	0.66	[28]	Vitis vinífera L. cv tempranillo
MTVI3	$1.2\times \left[1.2\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{550}\right)-2.5\times \left({\mathrm{R}}_{670}-{\mathrm{R}}_{550}\right)\right]$	0.01	[28]	Vitis vinífera L. cv tempranillo
NDVI	$\frac{{\mathrm{R}}_{800}-{\mathrm{R}}_{670}}{{\mathrm{R}}_{800}+{\mathrm{R}}_{670}}$	0.68 0.57 0.03	[28] [36] [37]	Vitis vinífera L. cv tempranillo Vitis vinífera L. cv chardonnay Vitis vinífera L. cv cabernet sauvignon
TCARI/OSAVI	$\frac{3\times \left[\left({\mathrm{R}}_{700}-{\mathrm{R}}_{670}\right)-0.2\times \left({\mathrm{R}}_{700}-{\mathrm{R}}_{550}\right)\times \left(\frac{{\mathrm{R}}_{700}}{{\mathrm{R}}_{670}}\right)\right]}{\left(1+0.16\right)\times \left({\mathrm{R}}_{800}-{\mathrm{R}}_{670}\right)/\left({\mathrm{R}}_{800}+{\mathrm{R}}_{670}+0.16\right)}$	0.58 0.01	[28] [38]	Vitis vinífera L. cv tempranillo Vitis vinífera L. cv thomson seedless
SRI	$\frac{{\mathrm{R}}_{800}}{{\mathrm{R}}_{550}}$	0.64	[28]	Vitis vinífera L. cv tempranillo
PRI	$\frac{{\mathrm{R}}_{530}-{\mathrm{R}}_{550}}{{\mathrm{R}}_{530}+{\mathrm{R}}_{550}}$	0.25 0.53 0.19	[28] [38] [37]	Vitis vinífera L. cv tempranillo Vitis vinífera L. cv thomson seedless Vitis vinífera L. cv cabernet sauvignon
RDVI	$\frac{{\mathrm{R}}_{800}-{\mathrm{R}}_{670}}{\sqrt{{\mathrm{R}}_{800}+{\mathrm{R}}_{670}}}$	0.10	[28]	Vitis vinífera L. cv tempranillo

GI = Green Index, GNVDI = Green Normalized Difference Vegetation Index, MCARI = Modified Chlorophyll Absorption in Reflectance Index, MSAVI = Improved SAVI Index, MSR = Modified Simple Ratio, MTVI3 = Modified Triangular Vegetation Index, NDVI = Normalized Difference Vegetation Index, TCARI/OSAVI = Transformed Chlorophyll Absorption in Reflectance index/Optimized Soil-adjusted Vegetation Index, SRI = Simple Ratio Index, PRI = Photochemical Reflectance Index, RDVI = Renormalized Difference VI.