Geographic Database Engine Design And Realization

The paper researches the Geography Database Engine. First of all, the paper illustrates the concepts and the fundamental functions of GDE. Then it studies four primary problems. Those are data model, data index, geographic data management and geographic data access objects.In the case of data model, the paper illustrates several popular data models firstly. Then it puts forward data model of GDE which satisfies the requests to store and manage data of great capacity efficiently. Finally, experiment is made on the method and efficiency of data storage. In the case of data index, the paper generalizes several advanced data index at the present time and analyzes the feature of data index based on database emphatically. Then it illustrates the spatial ordering quad-tree index based on database of GDE. In the case of geographic data management, the paper studies and tests several primary technologies, such as data concurrent access, data storage, data query, data update and maintenance, data transmission and data buffer, and so on. In the case of geographic data access objects, the paper illustrates the geographic data access class realized by oriented-object technology. During researching and realizing of GDE, UML(United Modeling Language) is adopted to carry through the requirement analysis and the program design in Rational Rose2002. At the end of the paper, the GDE production realized with oracle objects for OLE in the environment of Visual C++ is summarized and reported.