摘要
本文从网络图形的拓扑关系出发,采用ER模型分析点、弧段和面域之间的关系,构建ER图,建立关系数据模型,提出了始结点和终结点、始遇点和终前点的概念,从而解决了弧段的点记录不等长的问题,使得在关系数据表中既能记录属性数据,又能记录空间数据,并采用嵌入式SQL技术及游标变量,实现对空间对象的简单查询和分析功能。
In this paper,the author analyses those topological relations between nodes (or vertex),arcs and fields,and builds ER modal graph.The Author also advances the conception of start-node and end-node,first-vertex and end-vertex,so that related-type digit modal is made.This digital modal need to store necessary data referred to those records that have non-equivalent components.Spatial data and feather data can be stored in relation database library.Author programs in imbed-SQL search and find with vernier variant to the data in database library,this procedure command can realize some spatial analysis functions.
出处
《测绘科学》
CSCD
2004年第5期22-24,共3页
Science of Surveying and Mapping
基金
中南林学院青年科学基金(0482)
关键词
空间数据
关系数据库
拓扑关系
空间分析
spatial data
related-type database
topological relation
spatial analysis
