数字流域环境数据集成与共享研究

作为数字地球的有机组成部分,数字流域是一个异构的、分布式的巨型信息系统.数据集成与信息共享是数字流域的基本要求和技术难点.没有良好的数据集成与共享机制,各地区、各部门的数字流域建设只能停留于"信息孤岛"的水平,不能充分发挥数字化建设的整体效益.本文提出了基于XML技术的三层架构解决数字流域数据集成与共享问题,即应用层,中间层和XML包装器.其中,应用层向中间层发出数据请求,按给定协议接受并处理来自中间层的XML文档;XML包装器是各种异构数据的提供者,中间层是连接应用层和XML包装器(wrapper)的桥梁.文章最后结合我国水资源和防洪管理模式,给出了符合我国实际的一个数字流域数据集成与共享实现框架.

Research on the Data Integration and Information Sharing in Digital Basins

The Digital Basin comes from the Digital Earth, which is a huge, complex information system with heterogeneous and distributed components. Data integration and information sharing are two basic requirements and the key technologies to success, without which the information systems of all level management of the Digital Basin will be an "isolated information island". This paper proposed a new XML-based architecture to tackle this problem, which consists of three tiers, i.e., the application tier, the mediator tier, and the XML wrapper. The application tier sends out data and information requests and receives the required results as XML documents from the mediator. The XML wrapper provides all kinds of heterogeneous data requested while the mediator is the "bridge" between the application tier and the XML wrapper. At last, according to the realities of the management of China water resources and flood-control, an implementation framework of the Digital Basin based on the aforementioned XML-based architecture is provided, which proved that the presented methodology is viable.