| 摘要 |
PURPOSE: 3D tunnel expression is provided to generate a 3D tunnel by using 2D map data, a geographic altitude map, and a limited pattern. CONSTITUTION: Road network data including a plurality of road segments is provided(42). A tunnel segment is identified on a road network(43). A geographic altitude map is provided(44). A limited pattern of a 3D tunnel body is provided(45). 3D expression of a tunnel is generated based on the tunnel segment, the geographic altitude map, and the limited pattern(47). [Reference numerals] (41) Start; (42) Providing road network data; (43) Identifying a tunnel road segment; (44) Providing a geographic altitude map; (45) Providing a pattern; (46) Determining the altitude of an entrance and an exit; (47) Generating a 3D body; (48) Storing a 3D object in map data; (49) End
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