【摘要】 本文提出了RGIS面临数据之间和系统之间不统一的问题,介绍了一种具有高效空间数据交换机制的铁路地理标记语言(RGML)来解决,重点论述铁路地理标记语言的对象模型,包括地物特征对象和几何对象,地物特征对象定义了空间对象的内容和结构,几何对象提供了详细的基本空间几何组件定义.最后给出RGML描述省界的实例,说明用RGML处理铁路空间数据的优势.更多还原

【Abstract】 Approaching the actuality of China railway geography information system,in view of the discordance of data and system one another in RGIS,this paper presents a railway geography markup language(RGML),which is a much effective mechanism of spatial data exchange,and focuses on discussing the schema of RGML:feature schema and geometry schema.Feature schema defines content and structure of geographic feature while geomery schema puts forward the details of basic component of geographic geometry definition.At last,it presents an example for describing provincial boundary to show the advantage to handle railway spatial data by RGML.更多还原