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A heuristic algorithm for intersection cleanup-implemented in IGL

The cost-effectiveness of producing maps on an interactive graphics system is largely inversely proportional to the time the operator spends performing editing operations. Intersection cleanup has traditionally required cumbersome and time consuming editing operations which frequently have diminished the advantages of employing a computer graphics system in mapping applications. Prior algorithms to perform automatic cleanup of intersections have been incomplete and unsuccessful, handling only a few special cases that occur among two intersecting streets composed of lines. Other algorithms have required tremendous amounts of memory by employing brute-force methods to obtain a somewhat broader, yet still restricted, solution. This paper discusses a new, heuristic approach to the problem of cleaning up intersections.