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The barges were filled and covered with sediment to create a new island for birds including endangered dunlin, curlew, ringed plover and lapwing.
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The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.