导航电子地图数据物理存储

为满足嵌入式系统中导航需要,研究了导航电子地图数据的物理组织与存储.对比了导航电子地图数据物理存储常用的2种实现方法:嵌入式数据库和基于文件系统的方法,提出了采用基于文件系统的实现方法.论述了导航数据物理存储的逻辑结构,提出采用多文件分块实现数据的存储.针对物理存储中导航地理要素检索定位的重要性,研究了基于数据管理框架的数据检索方法.以二进制文件为基础,给出了导航电子地图物理存储文件格式的具体定义.试验结果表明,该导航电子地图物理存储方法在满足导航系统性能需求的基础上,能较好地支持导航系统主要功能的实现,适合于导航服务系统.

Physical storage of navigating digital map

Physical storage and organization of navigating digital map data are studied for the requirement of navigation service in embedded system.After comparing different physical storage realization methods of navigating digital map,i.e.,embedded database method and file system based method,the file system based realization method is employed.Logical structure of navigating digital map's physical storage is addressed and a multifile method is put forward to realize the data storage.According to the importance of index and location of navigating geographic elements,a data management frame based data index method is studied.Based on binary file,the definition of the physical storage format is expounded.Experiment results show that the physical storage method described in this paper is able to meet the performance requirements of navigation system and can well support the realization of navigation functions, being suitable for navigation service system.