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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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深山中的贵州龙里县，从修通产业路到规模化种植，从种苗繁育到开展深加工，政策持续发力，产业逐步升级，刺梨成为托稳果农增收的支柱产业。
Things humans don’t write down
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Anthropic 现在处于一个「既要又要」的两难境地：既想维持安全、不反人性的模型定位和公司形象，又不愿意错过美国政府的大单。