针对移动终端中在线电子地图展示不稳定、流量消耗大和离线电子地图更新难、数据无法加密等问题,提出一种基于金字塔模型的在离线一体化电子地图应用框架。通过构建在线离线的无缝切换方法,实现了在线地图的流畅浏览、离线数据的自动更新,并降低了对移动数据流量的消耗。借助SQLCipher技术实现对离线数据的加密,通过实验与Arc GIS等相关地图框架对比,所提出的框架有效降低了移动端的数据流量,提高了数据安全性,同时在网络不稳定条件下保证了地图的稳定浏览及离线数据的及时更新。

Aim to solve these problem that online map is not unstable, mobile data traffic is expensive and offline map update difficult, data cannot be encrypted and so on exit in these applications, we designed an electronic map application framework of on-offline integration based on pyramid model. In this framework, we built a method of seamless handoff of online-offline to browse map smoothly, update the offline data automatically and reduced the mobile data traffic. At the same time, we used SQLCipher technology to implement offline data encryption. Comparing with Arc GIS runtime framework and others, the results show that the proposed framework can reduce the mobile data traffic effectively, improve the offline data security, support the map of the stable browsing and update the offline data in real time.