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.
Никита Абрамов (Редактор отдела «Россия»)
，这一点在Line官方版本下载中也有详细论述
Раскрыты подробности похищения ребенка в Смоленске09:27
“一张蓝图、一个目标，县委一任接着一任、一届接着一届率领全县干部群众坚持不懈干”，把“不毛之地”变成了“塞上绿洲”。