网络地图服务传输机制的研究

The Research of Theory on Network Map Service Transmission

就目前网络地图服务过程中所涉及的信息传输机制问题进行了研究。传统的地图传输模式主要偏向于信息的表达和获取之间的关系,特别是地图符号化以及使用者对地图表达的认识能力。在此基础上,提出网络地图服务传输的基本框架,探讨了网络地图服务传输的新模式。认为它们必须经过服务请求和服务响应两个过程,以及需求信息到数据描述语言的转换、需求描述到服务描述的转换、数据描述语言到地图数据提供的转换等3种信息转换。

This paper analyzes the theory of information transmission in the process of present network map service. The traditional cartographic communication transmission mode leans to relationship between information expression and acquisition, especially the traditional map symbol and user＇ s cognition ability of map expression. This paper indicates the basic framework of network map service transmission and discusses new mode of network map service transmission. It describes two processes of basic transmission, such as service request and service response and three steps of information transition, that is, from requirement information to data description language, from requirement description to service description and from data description lan- guage to map data supply.