移动数据库SwiftDB的嵌入式GIS设计与实现

结合东南大学计算机系数据库及信息系统研究室自行开发的移动数据库系统SwiftDB，提出了嵌入式GIS的实现方案。由于嵌入式设备的内存和运算速度无法与PC相比，因此提出了矢量栅格存储结构，在此基础上设计了动态划分地图区域的方法。该结构在最短路径查询中获得了较好的结果。由于移动环境具有低带宽、高延迟、易中断的特点，因此根据所传输的数据量，提出了不同的地图数据更新方法，在维护数据一致性的同时也提高了系统的效率。

Embedded GIS Design and Implementation Based on Mobile Database SwiftDB

Combined with the mobile database system SwiftDB developed in the Laboratory of Database and Information System of Southeast University, the implementation method of embedded GIS is brought forward. Because the computing and storage capacity of embedded equipment are both less than PC, a data structure of vector and grid combination are presented. Based on this structure, an idea of dynamic block division is designed. The data structure has been applied in the example of shortest path query. Due to low bandwidth, high delay and easy to interrupt in the mobile environment, this system designs different methods for updating the map data based on the data volume. These methods benefit the consistency of data and the performance of the whole system.