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.
Feb 24, 2026 2:18 PM
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第五十二条 猥亵他人的，处五日以上十日以下拘留；猥亵精神病人、智力残疾人、不满十四周岁的人或者有其他严重情节的，处十日以上十五日以下拘留。