James Winslade, a beef and arable farmer from Somerset, has seen more than 90% of his farm submerged in the recent rains, and said he is days away from losing his crops to rot.
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.
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While not a cover of The Yardbirds' 1965 single of the same name, it aims for similar territory.，推荐阅读91视频获取更多信息
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