Importance

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Abstract

Embodiments of the invention are systems for applying clothoid curve values to roadways in a geographic data information system. One embodiment is a system, comprising: a geographic data information system, wherein the geographic data information system stores database segments in a database, wherein the database segments describe roadways; and a system for applying clothoid curve values to roadways, wherein the system for applying clothoid curve values to roadways: determines segment chains from the selected database segments; prepares the segment chains for transition to curvature space; transitions 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; smooths the curvature function; fits the smoothed curvature function with a more generalized form which remains within a selected tolerance of the smoothed curvature function; and stores identified segments of straight lines, transition zones, and segments of constant curvature in the geographic data information system.

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First Claim