COMPUTER READABLE STORAGE MEDIUM STORING INSTRUCTIONS FOR APPLYING CLOTHOID CURVE VALUES TO ROADWAYS IN A GEOGRAPHIC DATA INFORMATION SYSTEM
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United States of America Patent
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Issued Date -
Jun 4, 2009
app pub date -
Feb 15, 2008
filing date -
Dec 4, 2007
priority date (Note) -
Abandoned
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Abstract
Embodiments of the invention include a computer readable storage medium storing instructions for applying clothoid curve values to roadways in a geographic data information system. One embodiment is a computer readable storage medium, storing instructions executable by a processor for applying clothoid curve values to roadways in a geographic data information system, the instructions comprising: selecting database segments in the geographic data information system, wherein the database segments describe roadways; determining segment chains from the selected database segments; preparing the segment chains for transition to curvature space; transitioning to a curvature function in the curvature space, by computing heading change at points along the segment chain, resulting in a transformation of the segment chains into clothoids; smoothing the curvature function; fitting the smoothed curvature function with a more generalized form which remains within a selected tolerance of the smoothed curvature function; and storing identified segments of straight lines, transition zones, and segments of constant curvature in the geographic data information system.
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