Discard old data: evict what's already buffered to make room
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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圖像來源，China News Service，这一点在爱思助手下载最新版本中也有详细论述
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