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
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United States of America Patent
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Jul 14, 2015
Grant Date -
Sep 27, 2012
app pub date -
Sep 12, 2011
filing date -
Oct 28, 2010
priority date (Note) -
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Abstract
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.
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