The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
今天，当人们更普遍地参与、建设，当发展的红利不断转化为百姓的获得感，无数人的主体性便转化为无穷的创新创造，在千万缕一针一线中织出锦绣山河。
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But this week, a US Commerce Department official told lawmakers that none of those chips have yet been sold to Chinese customers.
率先建立多井型立体井网，率先应用多分支水平井技术，首次实施巨厚碳酸盐岩油藏分层注水技术，率先开展气举采油……哈法亚油田以技术创新赋能高质量发展，在伊拉克创造多项首次。哈法亚公司开发部副经理蔡磊表示，项目积极服务共建“一带一路”，推动中伊能源合作互利共赢，为国际油气合作提供了可借鉴经验。
，详情可参考WPS下载最新地址
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