Calculates the crown evenness from a TreeQSM.
Arguments
- cylinder
Cylinder field of a TreeQSM that is returned by
read_tree_qsm.
Details
The crown evenness is defined as "The crown cylinders divided into 8 angular
bins. Ratio between the minimum heights of the highest and lowest bin."
(Akerblom et al., 2017 & Terryn et al., 2020). Crown cylinders are determined
with crownset_qsm.
References
Akerblom, M., Raumonen, P., Makipaa, R., & Kaasalainen, M. (2017). Automatic tree species recognition with quantitative structure models. Remote Sensing of Environment, 191, 1-12.
Terryn, L., Calders, K., Disney, M., Origo, N., Malhi, Y., Newnham, G., ... & Verbeeck, H. (2020). Tree species classification using structural features derived from terrestrial laser scanning. ISPRS Journal of Photogrammetry and Remote Sensing, 168, 170-181.
Examples
if (FALSE) {
# Read tree qsm and calculate the crown evenness
qsm <- read_tree_qsm(QSM_path = "path/to/qsm.mat")
ce <- crown_evenness_qsm(cylinder = qsm$cylinder)
}