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。
The paper discusses several problems based upon SMDE, and do some research on data model spatial index structure, system designings and the process of exploiture.
论文将围绕专题军事地理数据库引擎的一些相关问题，对它的数据模型、空间索引结构、系统设计及开发过程进行研究。
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。
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.
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。
The R-tree is a commonly used index structure of spatial data.
树是常用的空间数据索引结构。
R-tree is a dynamic index tree of space search. Its structure use multi-dimensional region to express spatial data object. R-tree is a valid way to visit rectangle.
树是空间搜索的动态索引树，它的结构是利用多个维中的区间来表示空间数据对象，它是矩形访问的一种有效方法。
This paper classify a series of methods on spatial database index, and introduce the QR-tree index structure with very large spatial database.
在综述现有空间数据库索引技术的基础上，提出了一种面向大型空间数据库的QR-树索引方法。
The results indicated that: (1) the Angle index of spatial structure had the relationship with the area and the number of the samples.
结果表明：(1)空间结构参数中的角尺度与抽取的样方面积大小和样方数量有关。
The road density index analysis has two ways: the post-classification compare method based on spectral-spatial structure and the imagery difference method based on spectral-spatial structure.
道路密度指数分析法有两类方法：基于光谱—空间结构的分类后比较法和基于光谱—空间结构的图像差值法。
According to the characteristics of spatial index of grids and R-tree, a hybrid structure of spatial multilevel index is presented based on grid and R-tree.
结合网格索引和R树索引的特点，提出了一种基于网格与R树的多级混合索引。
By index evaluation and empirical analysis, we discuss the pattern and time gradient of Beijing-Shanghai railway's effects on regional spatial structure.
通过比较回归方程系数的大小变化、正负变化，研究京沪铁路对经济、社会、资源、环境的影响变化情况。
By index evaluation and empirical analysis, we discuss the pattern and time gradient of Beijing-Shanghai railway's effects on regional spatial structure.
通过比较回归方程系数的大小变化、正负变化，研究京沪铁路对经济、社会、资源、环境的影响变化情况。
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