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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.，这一点在同城约会中也有详细论述
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还有这种一次性就能给我们把海报翻译成不同语言的用法，直接就生成多个地区的广告图片。