【摘要】 基于位置服务技术对地理信息系统和全球定位系统的发展和应用研究具有重要意义。概述基于位置服务的体系架构研究现状,给出基于P2P架构的位置服务模型。介绍该模型所涉及的相关技术,给出基于P2P架构的位置服务的原型实现PLbs。以交通信息系统为例进行研究,表明该模型能够提高基于位置服务系统的性能。更多还原

【Abstract】 Location-Based Services play an important role in the developments and applications of geographical information system and global positioning system.The architectures of LBS are discussed in this paper.After bringing forward LBS model based on P2P,a prototype system named PLbs is presented and implemented.The PLbs model includes spatial data layer,network service layer and location application layer.Each layer is designed and deployed according to the P2P thoughts.All of the data and services are distributed in different peers.The peers can perform the tasks concurrently.The PLbs model also solves the problems of interoperation.The example of TrafficPLbs about traffic geographical information system is given,which shows this model improves the performances of LBS and has some values in the applications of LBS.更多还原