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科研人员凝神屏息、目不转睛——一台重型燃气轮机样机正进行实验。
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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.
This story was originally featured on Fortune.com。im钱包官方下载是该领域的重要参考
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