Raw point clouds obtained using Terrestrial Laser Scanner. The point clouds were collected using Leica Scanstation C10 laser scanner that operates with the green wavelength at 532nm. This scanner is capable to scan at most 300m distance object with the nominal accuracy of 4.5mm
After registration process, the unnecessary or noise point clouds of those originate from neighbouring trees, understory trees and ground surface are removed to avoid confusion and complexity in data processing. The point clouds are then separated into individual trees for further processing to estimate tree attributes. Further cleaning process of leaf and small branches are required to separate the trunk and branches prior to diameter estimation at different height intervals. The noise removal procedure has been done manually by a careful inspection of every single trees marked in the field as well as in the point clouds.
The geometric reconstruction of individual tree trunk was done by fitting the point clouds with cylinder model at different tree height.
The point clouds of tree crown is wrapped with convex-hull surface. The complete individual tree reconstruction is shown below:
