# A Machine Learning Approach for Mapping Chlorophyll Fluorescence at Inland Wetlands
## 2 Materials and Methods
### Vegetation Index Calculation
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Application** & **Abbreviation** & **Name** & **Equation** & **Citation** \\ \hline \multirow{6}{*}{NDARE} & rNDVI & Renormalized Difference Vegetation Index & rNDVI = \(\frac{R_{842}-R_{845}}{\sqrt{K_{845}+R_{845}}}\) & [46] \\ \cline{2-5}  & NDRE & Normalized Difference NIR / Red Edge & NDRE = \(\frac{R_{842}-R_{825}}{R_{842}+R_{825}}\) & [47] \\ \hline \multirow{6}{*}{PPR} & Normalized Difference & \multirow{2}{*}{PPR} & \multirow{2}{*}{PPR} & \multirow{2}{*}{PPR} & \multirow{2}{*}{PPR} \\  & 550/450 Plant & & & \\ \cline{1-1}  & Pigment Ratio & & & \\ \hline \multirow{6}{*}{PVR} & Normalized Difference & \multirow{2}{*}{PVR} & \multirow{2}{*}{PVR} & \multirow{2}{*}{[48]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1}  & Vigour Ratio & & & \\ \hline \multirow{6}{*}{RENDVI} & Red Edge Normalized & \multirow{2}{*}{RENDVI} & \multirow{2}{*}{[49; 50]} \\  & Difference & & & \\ \cline{1-1}  & Vegetation Index & & & \\ \hline \multirow{2}{*}{SAVI} & Soil Adjusted Vegetation Index & \multirow{2}{*}{SAVI} & \multirow{2}{*}{SAVI} & \multirow{2}{*}{\(\frac{R_{842}-R_{845}}{R_{842}+R_{845}+0.725}\times(1.0+0.725)\)} & [51] \\ \hline SLAVI & Specific Leaf Area & \multirow{2}{*}{SLAVI} & \multirow{2}{*}{SLAVI} & \multirow{2}{*}{[52]} \\  & Vegetation Index & & & \\ \hline SR & Simple Ratio 842/665 & SR = \(\frac{R_{845}}{R_{845}}\) & [53; 54] \\ \hline SRT & Simple Ratio 1610/2190 & SRT = \(\frac{R_{845}}{R_{825}}\) & [55] \\ \hline \multirow{6}{*}{S2 REP} & Sentinel-2 Red-Edge & \multirow{2}{*}{S2 REP} & \multirow{2}{*}{S2 REP = \(705+35\times\frac{(R_{845}+R_{830})+2)-R_{825}}{(R_{845}-R_{875})}\)} & [56] \\ \hline \multirow{6}{*}{CCCI} & Canopy Chlorophyll & \multirow{2}{*}{CCCI} & \multirow{2}{*}{CCCI = \(\frac{R_{842}-R_{845}}{R_{842}+R_{845}}\)} & [57] \\  & Content Index & & & \\ \cline{1-1}  & \multirow{2}{*}{CVI} & Red-edge-band & \multirow{2}{*}{CVI} & \multirow{2}{*}{[58]} \\  & Chlorophyll Index & & & \\ \cline{1-1}  & \multirow{2}{*}{IRECI} & Inverted Red-edge & \multirow{2}{*}{IRECI = \(\frac{R_{842}-R_{845}}{R_{842}+R_{845}}\)} & [56] \\ \cline{1-1}  & & Chlorophyll Index & & \\ \cline{1-1}  & \multirow{2}{*}{LCI} & Leaf Chlorophyll Index & \multirow{2}{*}{LCI = \(\frac{R_{842}-R_{845}}{R_{842}+R_{845}}\)} & [59] \\ \cline{1-1}  & Content & Modified Chlorophyll & \multirow{2}{*}{MCARI = \(1.2\times\)} & \multirow{2}{*}{[60]} \\  & MSCARI & Absorption in & \([2.5\times(R_{842}-R_{665})-1.3\times(R_{842}-R_{560})]\) & [60] \\ \cline{1-1}  & \multirow{2}{*}{TCARI} & Transformed Chlorophyll & \multirow{2}{*}{\(3\times[(R_{705}-R_{665})-0.2\times(R_{705}-R_{560})]\times\)} & [61] \\ \cline{1-1}  & & Absorption Ratio & \((R_{705}\div R_{665})\) & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & Triangular Chlorophyll Index & \multirow{2}{*}{\(\frac{\text{CI}}{\sqrt{(R_{705}-R_{560})-1.5\times(R_{665}-R_{560})} \times}\)} & [62] \\ \hline \multirow{6}{*}{Leaf Pigments} & ARI & \multirow{2}{*}{Anthocyanin} & \multirow{2}{*}{ARI = \(\frac{1}{R_{840}}-\frac{1}{R_{845}}\)} & [63] \\ \cline{1-1}  & & Reflectance Index & & \\ \cline{1-1} \cline{2-5}  & BGI & Blue Green Pigment Index & \(\text{BGI}=\frac{R_{840}}{R_{850}}\) & [64] \\ \cline{1-1} \cline{2-5}  & BRI & Browning & \multirow{2}{*}{BRI} & \multirow{2}{*}{[65]} \\  & Reflectance Index & & & \\ \cline{1-1} \cline{2-5}  & CI & Colorado Index & & \\ \cline{1-1} \cline{2-5}  & GLI & Green Leaf Index & \(\text{GLI}=\frac{2\times R_{840}-R_{845}-R_{845}}{2\times R_{840}+R_{845}+R_{84 5}}\) & [66] \\ \cline{1-1} \cline{2-5}  & PBI & Plant Biochemical Index & \(\text{PBI}=\frac{R_{845}}{R_{840}}\) & [67] \\ \hline \multirow{6}{*}{PSRI} & Plant Senescence & \multirow{2}{*}{PSRI = \(\frac{R_{845}-R_{845}}{R_{825}}\)} & \multirow{2}{*}{[68]} \\  & Reflectance Index & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2}{*}{[58]} \\  & 550/650 Photosynthetic & & & \\ \cline{1-1} \cline{2-5}  & \multirow{2}{*}{TCI} & \multirow{2}{*}{[58]} & \multirow{2