Research On Object-Oriented Three-Dimensional GIS And Visualization

The three-dimensional GIS is one of key technology of the digital city. Currently, most applications use two-dimension GIS to design, but reality is a real three-demension space, so can not display reality. Object-oriented three-dimensional GIS data model and visualization process for three-dimensional space, and get more reality taste, become now an important research subject. In this paper, three-dimensional GIS data model and visualization technology will be researched.In the aspect of data management, due to Spatial data models exist can not meet the need of management for spatial data and attribute data together. We provide a new object-oriented data model which is apt to "digital city" based on object-oriented technology. This model implements the store management for multi-demensional vector data. Final, we design a 3DGIS-SDE platform for three-dimensional GIS.In the aspect of visualization, based on the model and key technology such as LOD and multi-scale model, this paper solves the problem of visualization for three-dimensional GIS, which accelerates the speed of drawing scene and enhances the effect of visualization and reality. At the same time, with the technology of level encircle, this paper solves the problem of colliding in the three-dimensional scene, and displays the real three-dimensional space.Finally, the query process of three-dimensional GIS system is analyzed, and light illumination arithmetic for spatial analysis is discussed. A three-dimensional GIS query and analysis system (3DGIS) is designed and implemented with completely function.