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Table 2 Vegetation Indices (VI) tested in this study

From: Remote estimation of leaf area index (LAI) with unmanned aerial vehicle (UAV) imaging for different rice cultivars throughout the entire growing season

VI Formula References
NDVI \((\rho_{NIR} - \rho_{red} )/(\rho_{NIR} + \rho_{red} )\) Rouse et al. [71]
EVI2 \(2.5 \times (\rho_{NIR} - \rho_{red} )/(1 + \rho_{NIR} + 2.4 \times \rho_{red} )\) Jiang et al. [35]
WDRVI \((\alpha \times \rho_{NIR} - \rho_{red} )/(\alpha \times \rho_{NIR} + \rho_{red} )\), \(\alpha = 0.2\) Gitelson et al. [72]
\({\text{CI}}_{{{\text{green}}}}\) \(\rho_{NIR} /\rho_{green} - 1\) Gitelson et al. [73]
\({\text{CI}}_{{{\text{rededge}}}}\) \(\rho_{NIR} /\rho_{red edge} - 1\) Gitelson et al. [73]
NDRE \((\rho_{NIR} - \rho_{red edge} )/(\rho_{NIR} + \rho_{red edge} )\) Gitelson et al. [74]
MTCI \((\rho_{NIR} - \rho_{red edge} )/(\rho_{red edge} - \rho_{red} )\) Dash et al. [75]
OSAVI \((1 + 0.16) \times (\rho_{NIR} - \rho_{red edge} )/(\rho_{NIR} + \rho_{red edge} + 0.16)\) Steven et al. [76]