# pool = "tank" # discovered from server; override if needed
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
。关于这个话题，搜狗输入法下载提供了深入分析
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Just look at the numbers for processing the entire planet for a car profile: