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。
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。
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。
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 structure index can be used to describe the spatial distribution of human activity.
景观结构指标可以用来描述人类活动强度的空间分布。
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。
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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