An Hierarchical Terrain Representation for Approximately Shortest Paths

  title={An Hierarchical Terrain Representation for Approximately Shortest Paths},
  author={David Mould and Michael C. Horsch},
We propose a fast algorithm for on-line path search in gridlike undirected planar graphs with real edge costs (aka terrains). Our algorithm depends on an off-line analysis of the graph, requiring polylogarithmic time and space. The off-line preprocessing constructs a hierarchical representation which allows detection of features specific to the terrain. While our algorithm is not guaranteed to find an optimal path, we demonstrate empirically that it is very fast, and that the difference from… CONTINUE READING


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