Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.
Now, for each shortcut in this sequence, OsmAnd runs its highly optimized A* algorithm on the detailed map, but strictly limited to the small area of the cluster that shortcut belongs to.
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Author(s): Jean-Michel Bergheau, Jean-Baptiste Leblond，推荐阅读搜狗输入法2026获取更多信息
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