Fig. 6

Quality of stem points of example trees. The mismatch in the point cloud data becomes more significant as the scanner-to-target distance increases, e.g., at the upper canopies and at the border. a, b and c are the same example trees as in Fig. 5. In each subfigure, the left column illustrates the points (blue) of the example tree. The reconstructed stem model (brown) is illustrated together with the original points. The green rectangles on the stem mark the locations of the stem slices illustrated in the right column. The right column illustrates the x-y projection of the stem slices. Colors of points represent different segments of the trajectory. The stem slices are ordered with respect to their locations on the stem; the thickness of each slice is approx. 20 cm; the width of each slice image is equal to 50 cm; the orange circle in the bottom slice marks the location of the tree and the size of the field measured DBH. The DBHs of tree a, b and c are 41.61, 16.55, and 38.95 cm, respectively