Urban Modeling Method And Realization Based-on 3D Urban Planning

With developing of computer hardware technology, microcomputer's enormous data process capability gets developing very much. At the same time, digital expression capability for terrain and body objects gets improving rapidly with developing of modern mathematics, computer graphics and computer software technology. It is possible that the conventional urban planning method switches to the urban planning method based on three dimension space.First, this thesis introduces research background and actuality of urban planning design based on three dimension space and three dimension urban models, indicates how to work for my research.Second, it's my main work to discuss modeling methods of three dimension urban models based on urban planning and methods of realization of application programs developing. There are two points in the process of my research that one is urban modeling method, another is creating database of urban models' attribute. Here, urban models fall into two classes: terrain models and objects models. Two kinds of models combined to make an urban model by splicing two kinds of layers of the two models. It is important in my thesis to discuss methods of urban modeling for terrain and objects models, managing and organizing method to data of urban model, methods of 3D visualization for terrain and objects models. It plays an important use on organizing and managing data and 3D visualization for data of urban models, however, which can't be satisfied quietly with demands of urban planning. So it is necessary that objects of urban models are added its attribute relevant to urban planning. In the process of my research, there are two methods to add its attribute that one is to add models' attribute automatically, another is to modify models' attribute manually. At the same time, the attributes of urban models are managed by a Microsoft's Access software-a database management system, which it uses the database access technology-ADO to combine models objects with the Access database.In the process of my experimentation, three dimension urban model is visualized by method of object-oriented program developing, combined with the Active Control technology, software developing tool of Microsoft Visual C++6.0. After having created a 3D scene, you can move, rotate, scale and delete objects, and so on. At the same time, you can add some entity models such as the architectures, the green sight, and query models' attribute too. Well you can realize simple functional analysis, dynamically browse scene in order to check it.Last, writer indicates continuative research work by making a summary of this experimentation, pointing out some questions desiderating to be solved in the processof developing.