The Research And Implementation Of The Web-Based Dynamical Geodesy Database

With the development of geodesy, computer, network and communication technology, the geodetic data quantity become more and more huge, and data type become more complicated. It is a very actively research field in recent years how to effectively utilize and manage geodetic data information, realize the sharing of the geodetic information. The progress of web and database technique provided a new idea and solution for the geodetic data management and information sharing. But now the dynamical geodesy network database is relatively lack in the domestic; the network database of Chinese Academy of Sciences just start. Basing on the present condition that database exists, this paper made use of the technique of database and J2EE (Java 2 Enterprise Edition), studied and discussed the establishing of the Dynamical Geodesy Network Database System (DGNDBS).This paper includes three parts. The first part introduced the traditional and modern geodetic data producing, organization scheme, and the influence of network. According to the development of geodetic database in the domestic and international, studied present condition and problem that the dynamical geodetic database exist, put forward using advanced web database technique and advanced development language to set up an efficient, universal, open platform to manage, release and share the spatial data.The second part discussed the theoretical knowledge and data models of DGNDBS; studied the feature, work model and main technique of the network database system. Compared the merit and shortcoming of several kinds of network server platforms, and discussed the relevant technique of the network database established.The third part studied some related problem to establish the client/server architecture of the DGNDBS, then designed and completed a DGNDBS prototype based on J2EE.It is detailed to discuss the dynamical geodesy data storing and the data co-operating technique, realized the services of data browsing, graphical display and data download at the client. In the end it is conclusion of this paper.Based on the aforementioned, this paper constructed the DGNDBS, which laid in foundation for the research of the DGNDBS and data sharing in the future.