Method for applying clothoid curve values to roadways in a...

Details Method for applying clothoid curve values to roadways in a... Method for applying clothoid curve values to roadways in a...

2011-03-22

2011-03-22

Vital, Pierre M (Department: 2156)

Data processing: database and file management or data structures

File management

File directory structure

Reexamination Certificate

active

07912879

ABSTRACT:
Embodiments of the invention are methods for applying clothoid curve values to roadways in a geographic data information system. One embodiment is a method, 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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<Author unknown> Ohio State University, “Shape Representation and Description,” http://sampl.ece.ohio-state.edu/EE863/2004/ECE863-O-ShapeFourier.ppt.
Li, Z., et al., “Smoothing an arc spline,” Computers and Graphics vol. 29 (2005), pp. 576-587. http://www.math.zju.edu.cn/cagd/Seminar/2006—SpringSummer/2006—Spring—Master—LYQ—ref.pdf.

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