ANALYSIS METHOD OF THREE-DIMENSIONAL POINT GROUP

摘要

PROBLEM TO BE SOLVED: To adapt positions of three-dimensional point groups expressing a contour of a feature to a two-dimensional map.SOLUTION: Three-dimensional point group data in which position coordinates expressing contours of a plurality of features in a three-dimensional coordinate space set for analysis are stored are prepared. The three-dimensional point group data are analyzed to find out shapes of two-dimensional features. Correspondence relation between the shapes of the features and building frames in two-dimensional map data is supposed and coordinate transformation of the whole three-dimensional point group data is performed so as to be adapted to the correspondence relation. Then shape changes generated in the three-dimensional point group data due to the coordinate transformation are evaluated. While changing the correspondence relation, correspondence relation in which a shape change is minimized is found out. Thus, three-dimensional point groups can be accurately adapted to the two-dimensional map and the three-dimensional point groups can be expressed by a terrestrial coordinate system.