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.
2024年12月25日 星期三 新京报
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CISA's executive assistant director for cybersecurity, Nick Andersen, will become the agency's new acting director while Gottumkkala will now be serving as director of strategic implementation at DHS. The leadership change comes just a month after reports that Gottumkkala uploaded sensitive documents to ChatGPT. Gottumkkala had requested special permiss …
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arXiv:2602.18602 (cs)