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.
第五条 国务院核工业主管部门、能源主管部门、核安全监督管理部门按照职责分工负责原子能研究、开发和利用活动的管理和监督。，这一点在搜狗输入法2026中也有详细论述
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