Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.
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2002年9月21日，根據飛行紀錄，克林頓搭上愛潑斯坦的私人飛機，與多位名人展開了一趟穿梭多個非洲國家的旋風之旅。，详情可参考夫子