摘要
提出了实现电子地图数据存储的一种实用模型。该模型将地图中的地理元素作为对象管理，整个模型分为高层地图元素对象、投影过程和低层几何对象三部分。其中每个几何对象都与一个高层地图元素对象相对应。几何对象将它的空间数据用群进行管理，非空间数据用常规关系数据库存储。通过对象内在唯一标识符进行两种存储的互访和操作。
In this paper, an objected oriented data model, which consists of three parts, is presented. The three parts are geographic element objects, geometric objects and projections between them. A collection scheme is applied in managing the spatial data of geometric object, which corresponds to one geographic element object manipulated by conventional RDBMS. The detail projection procedure is also discussed.
出处
《南京邮电学院学报》
1998年第1期61-64,共4页
Journal of Nanjing University of Posts and Telecommunications(Natural Science)
关键词
计算机绘图
电子地图
数据模型
面向对象技术
Computer graphic, Electronic map, Data model, Object oriented technology
