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.
Hockey players recount Rhode Island ice rink shooting
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Firefighters in Sicily have rescued about 400 rare books from a library in Niscemi that hangs on the edge of a mudflow, after a devastating landslide in January tore away an entire slope of the town and carved a 4km chasm.
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00563-3
В Санкт-Петербурге из земли внезапно забил фонтанВ Петербурге из земли забил фонтан из-за аварии