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.
FT Digital Edition: our digitised print edition
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Ambient’s dedicated alarm clock offers many of the conveniences of your smartphone alarms — highly customizable alarm schedules, a library of soundscapes and noise masks and even Bluetooth so you can connect earbuds. There’s no subscription, it sounds great and sleep insights are supposedly incoming. However, $250 is a lot. Check out our full review.
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Hagel argues that we could also be making problems for the future.
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