Study On Urban 3D-Modeling System Based On ObjectARX And Google Earth

The 21st century is a metropolitan century. The cities are growing bigger and bigger. People are not complacent about drawing on planning. Meanwhile, they need to establish a direct scene which is three-dimensional and real. People can see the city from different directions and different angles in this scene. As information technology, digital technology and network technology developing and introduction of the concept of Digital Earth, Virtual City has become the trend of the current social urban development. Combining with a large number of satellite remote sensing technologies, and GPS technologies, and computer network transmission technologies, reality simulation technologies,3D-modeling of urban building is the base of building a virtual city, which is based on the solid foundation for geographic information system. The establishment of the virtual city can provide to the people realistic three-dimensional scene of the city, in which you can easily view three-dimensional scene and urban lighting analysis feature.A fast method of urban buildings 3D-modeling is discussed in the course of this paper. Urban 3D modeling program which is designed to simplify and improve the usage of basic surveying and mapping data and make the tedious mechanical work from freed. Ways of 3D-model of building in city based on the existing mapping data are emphasized, including:Data coordinate system automatic conversion from the independent of Changsha coordinate system to WGS-84 coordinate system. AutoCAD polyline graphic data error is checked and automatically processed. DWG file format is converted to KML file format automatically. SketchUp is used to beautify building models and other landscaping. In this paper, an experimental system based on ObjectARX and Google Earth is designed and programmed in order to verify the feasibility of the method. It achieves the desired purpose. Finally, the method and experimental system in this article was summarized.