【摘要】 目前运用GPS浮动车采集交通信息的实践中,由于系统数据存储模式的分散和不规范造成的系统数据利用效率较低、开发和运行效率不高。本文以提高系统数据利用效率、优化系统开发和运行模式为目标,以面向对象理论为基础,在进行系统需求分析与结构框架设计的基础上,确定了系统的数据流图,提出了一种层级数据组织方法,并设计了系统动态数据库概念模型和逻辑模型。本方法可实现对系统数据的有效整合,降低系统各功能模块间的耦合度,在提高数据利用效率的同时,有利于提高系统的开发和运行效率。更多还原

【Abstract】 In the traditional traffic information acquisition system based on the GPS-equipped floating vehicle,the data utilization efficiency as well as the efficiency of development and operation are low due to the dispersed and non-standardized data store mode of the system.Therefore,taking the enhancement of the data utilization efficiency and the optimization of system development and operation patterns as targets,based on the object-oriented software design idea,the requirement analysis of the system,and the architechture frame design,a data flow diagram of the system was defined,a hierarchical organization method of data was proposed,and a conceptual model and a logical model of the dynamic database of the system were built.The proposed method can integrate and share the system data resource effectively,reduce the coupling degree of all functional modules,enhance the data utilization efficiency,improve the efficiency of development and operation of the traffic information acquisition system based on the GPS-equipped floating vehicle.更多还原