Power GIS needs to deal with a variety of spatial data effectively, so it requires a high-performance spatial index structure.
电力GIS系统需要对各种空间数据进行有效处理，这就要求有一个高性能的空间索引结构。
QR-tree, a spatial index structure based on R-tree and a kind of space partition method using Quad-tree, is proposed. Its data structure and algorithms are also stated.
提出了一种基于R-树与“四叉树”空间层次划分的空间索引结构QR-树，给出了其数据结构和算法描述。
It is always the key technology of spatial DBMS to find a efficient index structure.
找到一个高效的索引结构一直是空间数据库研究的重点。
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