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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"Marcus has covered for me twice. We've both had times when we're gunning hard for the company, and times we're not. The structure gives us permission to be human without everything falling apart," says Amin, who is based in San Francisco.
«В рекомендациях Государственного департамента США также содержится призыв воздержаться от поездок в Израиль. Гражданам США следует "рассмотреть возможность выезда из Израиля, пока доступны коммерческие рейсы"», — пишет газета.