地球系统科学数据共享研究与实践

Earth System Scientific Data Sharing Research and Practice

分布式、异构科学数据的整合集成与"一站式"共享服务是科学数据共享的关键和难点。首先,提出"创建地球系统科学数据共享联盟,共建、共享"的分散数据资源整合理念和按"总中心—分中心—数据资源点"三个层次的整合架构,然后,在组织模式上保障分布式数据资源的有效整合。即通过"元数据集中管理,数据体分散存储"的策略,从技术上保障分布式数据资源的快速整合。针对地球系统科学不同学科数据资源的特性,设计了地球系统科学数据核心元数据标准及扩展方案,利用MVC(元数据标准模型—显示视图—操作函数)模式实现多标准地学元数据的统一管理和自适应显示。最终,研究面向SOA的分布式地球系统科学数据共享平台,通过"一个总中心,认证中心和若干个分中心",形成物理上分布、逻辑上统一的分布式服务网络,从而为用户提供"一站式"的数据共享服务。

The Earth System Scientific Data Sharing Network （ESSDSN） is one of the key programs of Scientific Data Sharing Project in China. It is very important for global change and earth system science research as well as national macro strategic decision-making and socio-economic sustainable development. For scientific data sharing, there are two key technologic issues should be solved, i. e. distributed ＆ asynchronous data resources integration and one-stop sharing service. Firstly, the ideal of ＂founding Earth System Scientific Data Sharing Union by co-constructing and co-using＂ is put forward. And also three-level organization mode, head center- sub centers-data resource sites, is designed. From the viewpoint of technology, it adopts the method of centralized management for metadata and separate management for data body to integrate distributed data resources. Specially,in order to describe multi-discipline data resources, different metadata standards are used. However these metadata standards should be interchanged with each other. So the core metadata standard and extension method are researched using MVC （metadata standard schema, metadata view page, metadata handle control functions） mode to uniformly handle and visualize these different metadata standards. Finally, the distributed Earth System Scientific Data Sharing System （ESSDSS） is designed based on SOA （Service-oriented architecture）. It is divided into three logic tiers, i. e. data resources tier, business function tier and web services tier, and implements interoperability by web services. ESSDSS has been deployed in one head center and 13 sub centers to form a distributed and one-stop Earth System Scientific Data Sharing Network （ESSDSN）. Up to Dec. 2009,ESSDSN has integrated about 18TB data resources including 5 spheres of earth system and provided about 25.59TB data for many users freely.