Daniel Kükenbrink
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daniel-kuken.bsky.social
Daniel Kükenbrink
@daniel-kuken.bsky.social
88 followers 39 following 6 posts
Studying forests with lasers.
Scientist at the Swiss Federal Research Institute WSL @wslresearch.bsky.social
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daniel-kuken.bsky.social
Tree detection rate of NFI measured trees was at 82.6% on average with an RMSE of 2.8 cm for the DBH estimation. Especially steeper terrain challenged accurate DBH estimation and should be investigated more.
March 6, 2025 at 8:48 AM
daniel-kuken.bsky.social
Occlusion over all evaluated plots was minimal with 9% of the entire canopy volume in average. This ensures that handheld MLS with employed measurement strategy delivers a high coverage of the entire 3D canopy.
Example of a vertical transect through the point cloud and occlusion grid. Yellow to violet colours denote the percentage of occluded voxels relative to the total number of voxels in the transect depth. Therefore, occlusion of 100% means that all voxels were occluded. Green shades denote the logarithm of the sum of laser returns of all voxels within the voxel stack. The black dashed line represents the canopy height model (CHM) estimated from MLS data, and the solid blue line represents the CHM estimated from the reference ALS data e 2D occlusion map for the same plot and the acquisition pattern. The two dashed circles denote two concentric plots for tree evaluations in the NFI. Highlighted rectangular area denotes the transect area shown in the vertical transect shown on the left.
March 6, 2025 at 8:48 AM