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.
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后来,林木通的儿子找到了父亲的照片,发给杜耀豪。令杜耀豪最为惊讶的,是林木通的过度衰老,他去世时只有78岁,但照片里的他,看起来像是90岁老人。
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