## 4 Conclusions
Moreover, this work has partially been funded by the German Federal Ministry of Education and Research within the German-Plant-Phenotyping Network (DPPN) (project identification number: 031A053), the European Union in the frame of the INTEREST project 'Sensor Products for Enterprises Creating Technological Opportunities in airborne Remote Sensing' (SPECTORS) (project identification number: 143081) and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement number 721995 in the frame of the 'Training on Remote Sensing for Ecosystem Modelling' (TRuStEE) network. The authors declare no conflict of interest. Figure 11: Overview of the HyPlant processing chain consisting of the four processing cluster. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Reference Index** & \multicolumn{2}{c}{**Equation**} & **Author** \\ \hline Simple Ratio (\(SR\)) & \(\frac{R_{\rm max-60}}{R_{\rm max-60}}\) & 1 & & [81] \\ Normalized Difference Vegetation Index & \(\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}}\) & 1 & & [82; 83] \\ (_NDVI_) & \(\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}}\) & 1 & & [84; 85] \\ Red-edge Normalized Difference & \(\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}-R_{\rm max-60}}\) & 1 & & [86; 85] \\ Vegetation Index (_VDVI\({}_{\rm tot}\)_) & \(2.5\left[\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}+R_{\rm max-60}} \right]\) & 1 & & [86] \\ Enhanced Vegetation Index (_EV1_) & \(2.5\left[\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}+R_{\rm max-60}} \right]\) & 1 & & [87] \\ Red-Edge Position (_REP_) & \(700+4\frac{R_{\rm max-60}}{R_{\rm max-60}}\) & \(\left(R_{i}=\frac{R_{\rm max-60}-R_{\rm max}}{2}\right)\) & 1 & [87] \\ MERIS terrestrial chlorophyll index (_MTC_) & \(\left(\frac{R_{\rm max-60}-R_{\rm max-60}}{R_{\rm max-60}+R_{\rm max-60}} \right)\) & 2 & & [88] \\ Transformed Chlorophyll in Reflectance Index (_TCARI_) & \(3\left[\left(R_{\rm max-60}-R_{\rm max-60}\right)-0.2(R_{\rm max-60}-R_{\rm 60 0}\right)\left(\frac{R_{\rm max}}{R_{\rm max}}\right)\right]\) & 3 & [89] \\ Photochemical Reflectance Index (_PRR_) & \(4\) & & [90] \\ Canopy Photochemical Reflectance Index (_CPRI_) & \(5\) & & \\ Water Band Index (_WB1_) & \(\frac{R_{\rm max-60}}{R_{\rm max-60}}\) & 1,6 & [91] \\ \hline \hline \end{tabular}  
* The spectral windows correspond to nine spectral bands of HyPlant (center wavelength \(+\)4 bands): 2 This index originally was developed for the satellite MERIS, and thus we were given five the central wavelengths and the widths that correspond to the spectral bands of MERIS. We aim to represent the spectral resolution of MERIS, and thus we propose to use nine spectral bands of HyPlant (center wavelength \(\pm\)4 bands) for the MERS wavebands located at 681 and 758 nm (app. 15 nm spectral window), respectively, and 11 bands (center wavelength \(\pm\)5 bands) for the waveband located at 758 nm (app. 20 nm spectral window). 3 The Index ICARI was developed to use small spectral windows for the single wavebands. Various definitions are available in the literature. Thus, we propose to use small spectral windows corresponding to the spectral bands (app. 8 nm spectral window) in HyPlant (center wavelength \(\pm\)2 bands): 4 For the reference wavelength at 570 nm, we propose to use a spectral window of app. 5 nm three spectral bands in HyPlant, carrier wavelength \(\pm\)1 band). For the reference wavelength at 531 nm, we propose to use a similar spectral window of app. 5 nm three bands, center wavelength at 1 band). 5 We propose to use the Simple Ratio as an approximation of the LAT. The additive term of 0.2 originally proposed by [PERSON] et al. (2015) is sensor specific, and thus omitted in the index calculation based on HyPlant data. 6 The spectral window (955-970 nm) used for the index calculation is at the edge of the VISNIR sensor of the HyPlant DUAL module (975.3 nm). We thus propose to use the last nine bands of the VISNIR sensor for calculating the spectral window.  
\end{table}