资源环境数据格网的构建及其应用

资源环境、数据共享的紧迫性需要一个全新的资源环境研究平台,在该平台上不仅需要实现资源环境数据资源的共享,而且还要实现专业应用系统、计算模型、工具软件的共享。根据上述应用需求,利用数据格网技术,提出了资源环境数据格网的概念。遵循开放式格网服务体系结构构建了三层的资源环境数据格网,探讨了资源环境数据格网构建的关键技术。以1991-2001年环北京地区土地沙化分析为例,阐述了利用资源环境数据格网的应用。

Construction and Application of Resources and Environment Data Grid

Resources environment is the base of continual survival and development of human society. Researching resources environment can know the current status and the changing trends of the resources environment, and can sequentially explore the mechanism of resources environment changes. So there needs an open, distributed research platform to intensively study resources environment. With the platform, not only resources and environment data but also special application systems, models and software tools can be shared. According to the above requirement, this paper puts forward resources and environment data grid. The architecture of the grid mainly has the following types: the five-layered Sandglass Model, the OGSA (open grid services architecture), and the WSRF (Web Service Resource Frame). The OGSA takes services as core which can conveniently constitute uniform standard interface to manage all kinds of entirely different resources, and to accomplish sharing and cooperation. In this paper, the architecture of resources environment data grid is designed into three layers, i.e. grid resources layer, business logic layer and grid port layer, based on the OGSA. Furthermore, three key technologies are analyzed in this paper: resources environment data grid middleware, data resources gridding and the application function of resources environment data grid. Under the environment of J2EE, following the specification of the OGSI and the OWS spatial information, using the Web Services technology, the resources environment data grid can be realized. To illustrate the application of resources and environment data grid platform, a case of the sandy desertification in the surrounding areas of Beijing during 1991~2001 is studied.