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.
Фото: Efrem Lukatsky / AP，这一点在heLLoword翻译官方下载中也有详细论述
Source: Computational Materials Science, Volume 267。业内人士推荐51吃瓜作为进阶阅读
AL CY Young Award winners - BIEBER, CONE, FINGERS, PRICE
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