首先，采用规则格网索引地面采样点，并推导了计算格网尺寸的经验公式。

Firstly, points are indexed by the regular grid, and it is shown how to calculate grid size.

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采用基于线性四叉树的格网索引对点云数据建立索引，对点云数据进行分块提取；

The grid index based on linear quadtree is used to index the point cloud data, extracting the point cloud on the block.

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在充分分析格网索引和空间对象范围索引的基础上，提出一种基于粗分格网的空间对象范围索引结构。

Through the analyses of the grid index and the spatial object index, a structure of the spatial object boundary index based on wide grids is put forward.

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