| 摘要 |
PROBLEM TO BE SOLVED: To automatically create a road polygon from background data including various polygons such as the polygon of a city block. SOLUTION: A road polygon creating device automatically creates, from background data including at least one kind of polygon such as the polygon of a city block and a polygon of a road, a road polygon indicating the road area. Specifically, a unit area to be the unit of processing is set in the background data, and one unit area polygon corresponding to the unit area is created. Then, out of the polygons included in the background data in the unit area, all the polygons except for road attribute polygons related to the road are extracted and removed from the unit area polygon. The unit area polygon after the removal of all the polygons other than the road polygons is in such a state that the area other than the road is removed, and thus can be obtained as a road polygon. COPYRIGHT: (C)2008,JPO&INPIT
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