Fig. 13

Cubic clipping and histogram analysis of point clouds on a tree trunk. (a) Clipping point clouds with a thin cube. One- and two-dimensional distance-frequency histograms (b and c) of the point clouds. The red and green dashed vertical lines in (b) and (c) indicate the locations of the trunk center and bark, respectively, as simulated from field-measure DBH. The blue dashed curves in (b) and (c) are the simulated curves of normal and χ²-distribution, respectively