@misc{oai:mie-u.repo.nii.ac.jp:00015605,
 author = {HUANG, KAILI},
 month = {Mar},
 note = {application/pdf, The old-growth and giant tree is a nonrenewable resource with great value. However, old-growth giant trees are now at risk of falling due to aging and external pressures such as typhoons. In Japan,since some of the old-growth giant trees are located close to residential areas, damage from fallen trees can be severe in these areas. Moreover, as a symbol of the local community, the giant trees have great meaning to the local people. Therefore, it is important to check and record their periodic growth conditions. The purpose of this study was to record and measure the entire tree using aerial images taken by UAV from multiple directions. As a trial, Japanese larch (Larix kaempfer) and Japanese cedar (Cryptomeria japonica) located in Mie University Forest were recorded and analyzed.Orthophotos, dense clouds and 3D models of the tree were generated by SfM technology. The measurement from the reconstructions of the tree showed that tree height and DBH could be measured with relatively high accuracy using UAV images taken from the sides. This method was later promoted at Mt.Nonobori. An old-growth and giant Japanese cedar was recorded and measured. The measurements in different directions in our remote method differed from ground measurements by a range of 0 cm to 12 cm in DBHs and tree heights by a range of 3 m to 7 m. The results of this study showed that UAVs could be useful in recording the tree shape and measuring the tree structure parameters of the old-growth giant tree., Graduate School of Bioresources, Mie University Department of Environment Science and Technology Forest Operation and System, 80p},
 title = {Recording and measuring the shape of old-growth giant trees using UAV images},
 year = {2023}
}