Design on the Metadata Querying System of National Key Field Observing System and Its Application

The metadata is used as one of the means to solve the problems on data sharing. There is a corresponding relationship between metadata and dataset. We can visit, manage, query and analyze the dataset and even accomplish data mining through realizing data navigational functions. A great number of field observation stations have been set up in the major national scientific research fields, which provide plenty of detailed and real-time data. In order to make better use of all the data sources, it is urgent to set up the criterion on the metadata of national field observational stations. On the basis of this, the metadata querying system of national key observational stations is set up, aiming at the metadata managing, querying, searching, and issuing. Only by doing so, it is possibile to realize data sharing organizing and managing and make best use of the field observed data in the scientific research.