Tunnel entrance elevation specifying device, method for specifying tunnel entrance elevation, computer program for specifying tunnel entrance elevation, and storage medium that stores computer program

摘要

Systems for automatically specifying a tunnel entrance and methods that accomplish same. One method includes a target entrance selecting step for selecting, from a map data storing portion, a target entrance for specifying an entrance elevation of a tunnel, a target road link assigning step for assigning, from the map data storing portion, a road link, which includes the target entrance, as a target road link, a corrected point extracting step for extracting a certain point as a corrected point, the certain point being located along the target road link and away from the target entrance outwardly of the tunnel by a predetermined distance, a corrected point elevation specifying step for specifying an elevation of the corrected point as a corrected point elevation, and a first target entrance elevation specifying step for specifying the corrected point elevation as a first elevation of the target entrance.

主权项

1. A tunnel entrance elevation specifying device comprising:
a target entrance selecting portion that selects, from a map data storing portion, a target entrance for specifying an entrance elevation of a tunnel; a target road link assigning portion that assigns, from the map data storing portion, a road link, which includes the target entrance, as a target road link; a corrected point extracting portion that extracts a certain point as a corrected point, the certain point located along the target road link and away from the target entrance outwardly of the tunnel by a predetermined distance; a corrected point elevation specifying portion that specifies an elevation of the corrected point as a corrected point elevation; and a first target entrance elevation specifying portion that specifies the corrected point elevation as a first elevation of the target entrance, wherein the corrected point elevation specifying portion specifies the corrected point elevation based on mesh elevation data that indicates an elevation of a point on a map, the point on the map corresponding to a grid intersection point of a predetermined size mesh.