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.
next empty line. Finally, the 3618 was a "medium-speed" printer, meaning 155 lines per minute.
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How much for a good night’s sleep? $250?
Honor’s Robot Phone is set to make an appearance, and this time we might actually see it switched on. | Photo: Dominic Preston / The Verge
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Print-on-demand products
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