可搬型スキャニングライダーによる木本群落を有する庭園の景観モデリング

抄録

In the present study, we confirmed the utility of portable scanning lidar for landscape modeling of a garden with tree communities and quantification of biophysical variables of the trees in the garden. Multiple measurement positions were established between each tree in the garden and laser beams were fully illuminated to the trees. Obtained 3-D point cloud images were registered and shading effect was added to the data corresponding to a building and trees. Through these processes, a 3-D landscape model of the garden was produced. The model allowed to visual assessment of the garden from any viewpoints and it was confirmed that the model faithfully reproduced the complicated form of the trees and the one of the building within the garden. Then, 10 trees were selected from the model and their tree heights, diameters at breast height were estimated. By comparing the estimation and the actual values, the errors of the tree heights and diameters at breast height ranged from -0.48 to 0.28 m and -0.04 to 0.05 m, respectively. Moreover, stem volume was estimated from the lidar-derived tree heights and diameters and a stem volume map was produced.