2. 合并：将两个有序子数组合并成一个有序数组
The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.，这一点在夫子中也有详细论述
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So, how does OsmAnd use this structure to calculate your route at lightning speed? It's a multi-step process:
We’re accepting limited sponsors for the elementary Blog. View our public analytics and learn more if you are interested.，这一点在51吃瓜中也有详细论述