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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（二）在英雄烈士纪念设施保护范围内从事有损纪念英雄烈士环境和氛围的活动，不听劝阻的，或者侵占、破坏、污损英雄烈士纪念设施的；。搜狗输入法2026对此有专业解读
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