Function subdivide2QTree

subdivide2QTree(grid, maxDepth): QTNode
（简易四叉树）创建一个 gridMBR 层面的四叉树
Parameters
- grid: Grid
- maxDepth: number
  
  |---------->x
  
  | 2 | 3 | |-------- | 0 | 1 | | y
Returns QTNode
- Defined in src/coverage/grid.ts:360

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