Selected and analyzed structural metrics obtained from QSMs (quantitative structural models) from the ITSMe R package (Terryn et al. 2023). Descriptions from Åkerblom et al. (2017), Terryn et al. (2020), and using the TreeQSM_Architecture matlab functions (Jackson et al. 2019b).
| Number | Name | Abbreviation | Description | Source |
|---|---|---|---|---|
| 1 | Crown Height | ch | Vertical distance between the highest and lowest crown cylinder relative to tree height. | ITSMe (Terryn et al. 2023) |
| 2 | Crown Evenness | ce | Crown cylinder divided into 8 angular bins. Ratio between extreme minimum heights in bins. | ITSMe (Terryn et al. 2023) |
| 3 | Crown Diameter to Crown Height Ratio | cdhr | Ratio between crown diameter and crown height. | ITSMe (Terryn et al. 2023) |
| 4 | Crown Area | ca | Maximum ground area covered by the crown viewed from above. The crown is defined as all the cylinders with branching order greater than one, which is given by the QSM fitting software. | TreeQSM_Architecture (Jackson et al. 2019b) |
| 5 | Crown Volume Asymmetry | c_asym | The ratio of mean to maximum woody volume contained in each segment of crown. These segments were defined starting from the position of the base of the tree and summing the volume cylinders in the crown between angles 0 to 458°, 46 to 908°, etc. | TreeQSM_Architecture (Jackson et al. 2019b) |
| 6 | Total Volume | tv | Total volume of all cylinders that make up the tree. | TreeQSM_Architecture (Jackson et al. 2019b) |