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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Over the past three years the number of people sleeping rough in Leeds has risen 75% - from 37 to 65 -according to the snapshot data, although the 2025 figure is down slightly on the 69 rough sleepers recorded in 2024.
Now a feature-length documentary called Spacewoman, which chronicles her trailblazing career, looks set to change that.