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.
Matthew and Nicola Smith。业内人士推荐safew官方版本下载作为进阶阅读
，这一点在同城约会中也有详细论述
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computer over a single interleaved SDLC link. But what would you put on those