面向嵌入式数据库的导航电子地图组织方法

An Organizational Method of Navigation Electronic Map for Embedded Database

以道路网为核心,提出了一个通用导航电子地图概念模型,并在其基础上重点研究了面向嵌入式数据库的导航电子地图组织方法。在本模型中,道路网被划分为通过线性参考互相联系的几何基准、逻辑网络和事件集三个模块,并采用分层、分区域的数据组织模式,体现了经典GIS-T模型和主流导航电子地图物理存储格式的主要优点。为了建立具有较高访问效率的导航数据库,提出了导航电子地图各个模块在嵌入式数据库中的组织策略,并着重介绍了利用数据聚集和HASH索引机制存储逻辑网络的方法。通过在嵌入式数据库SQLite中进行导航电子地图组织并在其基础上进行导航软件开发的实验,该导航电子地图组织方法被证明具有较好的可用性。

Oriented toward road networks, an universal conceptual data model of navigation electronic map is proposed, and on the basis of an organizational method of navigation electronic map for embedded database is emphatically discussed. In this model, a road network is divided into three parts of geometrical datum, logical network and accident collection, which are interrelated through linear referencing method, and is organized hierarchically and by district, reflecting the main merits of classical GIS-T data models and mainstream physical storage formats for navigation electronic map. In order to build up a navigation database with high dada access efficiency, some strategies for organizing every components of navigation electronic map in embedded database are presented, and the method of storing logical network on the mechanism of data aggregation and HASH index are prominently introduced. On the experiment of storing navigation electronic map in an embedded SQLite database and developing navigation software upon it, this method of organizing navigation electronic map is proved to be usable.