Secondary Development And Implement Of GIS Based On Arc Objects

As a Intersectional Science, GIS (Geographic Information System) is erected on the base of Computer Science, Topography, Remote Sensing, Geography, Environmental Science, Spatial Science, Informatics and Managing Science. Now, GIS is drawing more and more people's attention and used widely in city planning, market managing, resourse researching, environment monitoring and analysis, land resouse managing, forest monitoring and managing, estimating the yield of crops, fire alarming, traffic and safety managing, electrical net managing and so on.In this article, the author reviewed the history of the progresses in GIS' secondary developing methods in brief. The component object oriented model based on COM, OLE and ActiveX are the trend and direction of secondary develop of CIS.The author illustrated how to use the object oriented technique of ArcObjects and took four methods of developing for example. Furthermore, the application of the property, event and method of common component are also discribed. Supported by visual basic and the fuctions of arranging, analysis, display of spatial data in the componet, information system of campus was established. Most users , which are not familiar with the knowledge of complicated concept and operation of CIS, can use this system freely. The application of ArcObjects is a new research field of CIS and enlarges the scope of CIS' application. Geodatabase is a new object oriented data model of managing and organising data. In the system, it was used to build database. SceneViewer component was used to display three-dimensional model of campus.