关键词: 实时, 动态, 交通信息服务, J2ME, 数据组织

Abstract: At present，most navigation services are based on static traffic data and generally could not do well as the traffic situation changes fast.With multiple methods widely being used to obtain real-time traffic information，dynamic navigation services based on real-time traffic information are feasible to realize.The research developed a prototype service system of real-time traffic information based on J2ME/J2EEE as basis of dynamic navigation services.First，it summarized the public requirements of real-time traffic information.And it divided real-time traffic information into traffic events，information of traffic flow and information of vehicles.As to traffic events，it can be made up of point event，line event，face event and relation event according to their geometry features.In the second part，it formed data model for real-time traffic information and realized the data visualization，route computing and storage.Linear referencing methods and dynamic segmentation technologies are used for its visualization.In the third section，it discussed software architecture，which the system acquired，based on J2ME/J2EE.PostSQL and PostGIS softwares were utilized to manage spatial-temporal traffic information.The prototype system adopted central service structure.After some evaluation of the prototype，some future work is discussed.

Key words: real-time, dynamic, traffic information services, J2ME, data organization