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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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在使用中的航空器上使用可能影响导航系统正常功能的器具、工具，不听劝阻的，处五日以下拘留或者一千元以下罚款。
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The idea is to catch cancer before someone starts to get ill and when it can still be treated.，详情可参考搜狗输入法下载
“山西电力现货市场将全部电量纳入竞争机制，发挥价格‘指挥棒’作用，并安排新能源企业优先出清，促进资源合理利用。”山西省能源局有关负责人说。