【摘要】 针对城市快速路网信息化建设中普遍存在的异构交通数据难以充分共享的问题,按照路网拓扑、空间地理、动态信息数据的数据组织模式,建立了城市快速路网交通数据本体。在此基础上,建立了基于本体的城市快速路网异构交通数据集成技术方案。该方案利用本体建模共享交通数据语义,使用D2RQ引擎实现异构交通数据向本体数据的映射功能,并使用基于JENA的本体中间件将多源本体数据片段集成为统一的数据语义视图,允许上层交通信息服务更为顺畅地共享数据和更加智能地操作数据。基于该方案,针对西安城市快速路网开发了一款交通数据集成实例系统。研究结果表明:由于增加了交通数据的语义一致性处理,该方案的数据查询时间开销约为直接访问数据库的4倍,GIS控件动态加载的网络延时可忽略,可实现路网内系统之间多源异构交通数据的一致理解和充分共享,在中国城市交通信息化建设中具有重要的应用价值。更多还原

【Abstract】 Aimed at the problems of inadequate sharing of heterogeneous transportation data within urban fast road networks,an ontology model of transportation data was constructed,which divided transportation data into three categories,such as topology data,geographic data,and dynamic data.An ontology-based technical solution for heterogeneous transportation data integration was sketched.The solution utilized ontology to provide a common understanding of semantic meanings of transportation data,used D2RQ engines to map heterogeneous data into fragments of well-formed ontology data,and introduced JENA-based ontology middleware to integrate multiple fragments of ontology data into an integral view of data semantics.Therefore,it provided better data-sharing ability and more intelligent data manipulating approach for various topic-oriented transportation services in upper layer.A demonstration system of this ontology-based solution was developed for urban fast road networks in Xi’an.The results show that the time consumption of this solution is as 4times long as directly accessing database because of the additional semantic consistency processing of transportation data,but is still negligible compared with the dynamically loading delay of GIS controls.As a result,the solution can promote the ability of common understanding and adequate sharing of heterogeneous transportation data among network systems,which will play an important role in the informatization process of city transportation in China.5tabs,5figs,14refs.更多还原