TREE POSITION DETECTION DEVICE, TREE POSITION DETECTION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is not easy to accurately recognize positions of individual trees on the basis of tree crown shapes recognized from the sky above a forest.;SOLUTION: Positions of trees are detected using three-dimensional point group data of a forest, which is acquired by airborne laser measurement which measures a reflected signal waveform of a laser pulse made to sweep from the sky above. Heights represented by the point group data are converted to substantial heights from the ground surface to generate normalized point group data (S52). A certain height range within the forest is set as a branch height layer on the basis of difference in distribution of the normalized point group data between a tree crown region and a branch height region under it in the forest (S54). Normalized point group data belonging to the branch height layer is extracted and is projected on a plane along the ground surface to obtain a two-dimensional frequency distribution (S56). Positions of high densities of the normalized point group data in the two-dimensional frequency distribution are detected on the basis of prescribed criteria and are defined as tree positions (S58).;COPYRIGHT: (C)2012,JPO&INPIT