Data Sharing Technology Study On Grid For Ocean Data Visualization

Ocean environment data is the foundation of exploiting and utilizing ocean. It plays important role in the political,economy,military affairs and protecting national interests of our country. Many departments and prefecture spend plenty of people, matters and money on ocean data study, and obtain a lot of materials and data. However, the valuable data can not be made good use and be shared adequately in the society for a lot of reason. For the sake of reducing investment and investigate repeatedly, breaking all kinds of data barriers and improving the use benefits of the resources, the data must be shared adequately.The work in this paper is an important part of the"863"Project of our country ---"Study on Grid based on ocean data sharing and information service"(No. 2006AA09Z139).The amount of the ocean environment data is massive. The storage of the ocean data across multiple different platforms, and data formats and structures are different too. For making good use of the ocean environment data, by analyzing the data format and characteristic of the ocean data, a method of the ocean data sharing management by using the grid technology is proposed. The large amounts of ocean environment data are distributed at many joints in the grid, and they are managed efficiently. The users can visit and access the ocean environment data transparently at any time in any place. Thus it can help the ocean study conveniently.For making good use of the massive ocean environment data in the joints, we need to apply the metadata management and replica management technology. By using the metadata management technology, we could manage the massive data with little metadata. And no matter where the data locates, users can visit the unique logical file name of the data with the description and attribution of the data. Furthermore users can obtain the physical location of the replica with the replica management technology. The replica management technology provides several data copies for the users in different places in the WAN, and it can reduce the time of data access and the load of the network bandwidth.By analyzing the ocean environment data, its storage and management model are designed. Using the grid middleware and toolkits provided by Globus develops services module and implements the grid system of ocean environment data visualization. The system utilizes the Globus Toolkit and Web Services technology, and the OGSA-DAI as supporting platform at the bottom, adding the data sharing services and data format conversion services, provides the reliable support of the data sharing for the users.