| Component Software technology is a new kind of software engineering technology that developed after and as an extension of the Object Oriented technology. A new concept has been put forward since the rising of the Component Software technology which has already become one of the trends in current software technology. The use of component GIS has provided opportunities for the innovation and improvement of various GIS application systems. Component GIS is a kind of application of Object Oriented technology and component software technology in GIS software development. It properly abstracts GIS functions and provides them to users as components, which makes it take on many advantages that the traditional GIS lacks. Therefore, it provides completely new idea to solve the problems the traditional GIS faces.Though component GIS has been widely used in many fields, its application in the area of city land grading in China is currently seldom. In this paper, the development of Geographic Information System and the current research hot topics were reviewed, the principles of component technology and its features, the structure of the Component GIS and the method of its redevelopment were discussed in detail. This paper also compared the systems based on traditional GIS and component GIS separately. And the system analysis, system design and system implement of the city land grading information system developed by component GIS were studied particularly..Based on the theoretical research, this paper applied Component GIS method to develop the city land grading information system of Zhenjiang city as a case of practical application. In the Visual Basic development environment, SuperMap 2000 was used to realize the GIS functions of the system. We also built the city land grading models as components so as to achieve the seamless integration of the system finally. |
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