Research And Development Of Small Geographic Information System Platform

The traditional real estate information system exists some deficiencies when applied in the real estate agency field. The commercial GIS software has own disadvantages and is rarely used in the field. This paper makes a research on the structure of GIS (Geographic Information System), and developing a small WebGIS platform whose intellectual property right is owned by the developers and applied in the real estate agency field. The system plies the object-oriented technology mainly. Microsoft Visual C++6.0 is adopted to develop the software. A spatial database based on RDBMS (Relation Database Management System) is employed in design. A new spatial database model is brought forward to, which is suitable for real estate and throws away the traditional data management method that separates spatial data from attribute data resulting low efficiency. Block management is combined with layer management in map management function in order to make user use the software more conveniently and save the storage space. The spatial database model and the new map management manner can extend to the other fields. In network part, three-level model and Java Applet technology are selected that is independent of the platform. It is possible to make spatial data's storage, analysis and sharing by applying these technologies.In the first stage of developing, the system performs well, and the basic GIS functions, such as file operation, the conversion between different data formats, drawing vector graphics, ordinary query between spatial data and attribute data and map management, can be realized with correct result. However, it still needs a long period of hard work to implement the whole function of the system and in-depth development and improvement.It is important for the information industry of our country to develop software whose intellectual property right is owned by the developers. It is an audacious exploration that the paper researches into the structure and function of GIS. In the real estate field, the applications of GIS focus on real estate evaluation. The papers make an attempt at to apply GIS to the real estate operation.