摘要 |
PROBLEM TO BE SOLVED: To provide a road information creating method for automatically creating polygon data of roads and intersections on the basis of existing road network data and town plan data. SOLUTION: An initial road polygon is created by laterally extending road links in parallel by a prescribed interval. Right side road lines and left side road lines included in the initial road polygon are extracted from the town plan data. Average distance from the road links to each road line is obtained respectively. The shape of the road polygon is corrected so that the distance from the road link to the left side line and the right side line of the initial road polygon are the average distance. All the points at the intersection of side lines of two road polygons connecting to the intersection of road network data are obtained, and an intersection polygon of convex polygon with the intersections as its constitution points is created. The road polygon is corrected by deleting the areas overlapping the intersection polygon of each road polygon. COPYRIGHT: (C)2007,JPO&INPIT
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