quadtree index of space 四叉树空间索引
Quadtree index is the spatial indexmechanism based on the geographical division of space, which must know in advance the scope of the distribution of objects in space.
四叉树索引是基于地理空间划分的索引机制,必须预先知道空间对象的分布范围。
参考来源 - 基于地理空间的空间数据存储与检索研究·2,447,543篇论文数据，部分数据来源于NoteExpress
QR-Tree index combines the advantage of Quadtree and R-Tree, not only serves the need of high storing efficiency, but also avoid of many invalidation query, in order to achieve good query capability.
树索引结合四叉树和R-树的各自优点，既可以满足较高的存储效率，又避免太多的无效查找，达到较好的查找性能。
The grid index based on linear quadtree is used to index the point cloud data, extracting the point cloud on the block.
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；
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