"It's producing fragments of building stone, so it might be structural. We might be thinking of a small shrine or a chapel," says Dr Andy Seaman, from Cardiff University, who is leading the dig.
Charging case dimensions: 50 x 57.2 x 24.5mm
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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.