渐进式P2P移动空间数据传输技术研究

Mobile space data progressive transmission based on P2P technology

在分析当前移动GIS发展中存在的问题以及移动空间信息数据分发新需求的基础上,对在移动环境中数据量大、无线信号不稳定情况下的服务访问、数据传输等进行了深入研究.引入对等网络(P2P)技术,解决了在无线网络环境下客户端因受网络质量影响和大规模空间数据显示耗时长的问题,有效地提高了移动GIS系统的效率与稳定性.实验表明,通过P2P服务缓存下载和地图服务渐进式传输方式,能有效缩短用户访问的响应时间,改善因网络不稳定造成数据丢失的状况.

The new demand of current mobile GIS development and mobile spatial information data distribution are analyzed. On the basis of large volumes of data in mobile environments, the instability of the wireless signal data transmission and other aspects are discussed. The peer to peer network （P2P） technology is introduced to solve the problem of client subject to the influence of network quality and large-scale spatial data display time-consuming in a wireless network environment, and it effectively improves the efficiency and stability of the mobile GIS system. The experiment shows that cache download of the the P2P service and the progressive transmission of the map service can effectively shorten the response time of user access, and reduce the probability of the data lost due to the network instability.