基于分布式拓扑的P2P矢量地理数据表示模型的研究  

Study of distributed topology based representation model of P2P vector geography data

作　　者：吴家皋[1] 黄琳[1] 邹志强[1] 冯佳丽[2] 胡斌[3] 

机构地区：[1]南京邮电大学计算机学院计算机技术研究所,南京210003 [2]南京大学地理与海洋科学学院,南京210093 [3]南京师范大学虚拟地理环境教育部重点实验室,南京210046

出　　处：《计算机应用研究》2010年第6期2170-2172,2180,共4页Application Research of Computers

基　　金：国家"863"计划资助项目(2009AA12Z219);国家自然科学基金资助项目(40801149);南京邮电大学攀登计划资助项目(NY206009)

摘　　要：目前对矢量数据分布式拓扑关系的研究较少,且矢量拓扑表示方法不利于P2P矢量数据的共享和传输。提出一种基于分布式拓扑的P2P矢量地理数据表示模型。该模型结合矢量分片合并的思想,通过扩展WKT(well-known text)格式来维持矢量数据的拓扑关系。进一步,对该模型的性能进行了数学分析,并基于JTS(Javatopology suite)实现了相应的原型系统。理论分析和实验测试结果表明,该模型在选择适当的分片粒度情况下,能使数据传输比率最小化,从而验证了该模型提高数据传输效率和加快矢量数据分片、合并的有效性。Recently, studies of distributed topologic relationship of vector data are few, and vector topological representation is not propitious to sharing and transmission of P2P vector data. This paper proposed a distributed topology based representation model of P2P vector geography data. Combined the model with vector division and union ideas, which extended WKT （well-known text） format to maintain the topological relationship of vector data. In addition, analyzed performance of the mo-del by mathematical method, and implemented a prototype system of the model based on the JTS （Java topology suite）.The theoretical analysis and experimental test results show that the model can minimize ratio of data transmission with appropriate size of tile. Hence, the validity of the model, which can improve the efficiency data transmission and increase the speed of data division and union, is approved.

关 键 词：对等计算技术 矢量地理数据 拓扑 分片 表示模型 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]