The Research Of Spatial Objects Integrated Visualization And System Implementation

To model the underground objects, ground surface and ground objects visually and quantitatively has potential for a broad range of applications like: disaster warning, emergency rescue, city planning and layout of the regional economic. But traditional 3D GIS spatial data structures have some limitations, especially in modeling spatial objects integrally. As a result of this, the research of the integrated modeling, visualization and analysis algorithm has great theoretical and practical significance.Based on the development of"Monitoring and early-warning information system for the High-Cutting Slopes in the Three Gorges Area", this paper studies the algorithm of modeling and visualizing the underground objects, ground surface and ground objects integrally according to the system requirements and the limitations of the existing data structures, and then develops a corresponding prototype system after solving the key problems.By studying the existing 3d visualization modeling algorithms and 3D GIS spatial data structures, this paper points out the deficiencies of them in integrated modeling and visualization, and proposes a new concept of underground objects - ground surface - ground objects integrated visualization. Based on the new concept, this paper extends the data structure and modeling algorithm of 3D GIS, and decides to use the technical scheme of integrated modeling and visualization after some experiments on algorithm implementing and system developing.Then this paper studies the key technologies such as format conversion of the multi-source data, 3D visualization of the spatial objects, the integrated coordinate system, coordinate transformation and so on, and then develops a prototype system using C# and OpenGL which implements key functions like underground objects - ground surface - ground objects integrated visualization, three-dimensional navigation, 3D spatial query, spatial plane slice analysis and so on.The research in this paper breaks the limits of traditional 3D GIS data structures in integrated modeling and visualization, and improves the methods of modeling 3D GIS spatial objects to a certain degree. The research achievements are also applied to the"Monitoring and early-warning information system for the High-Cutting Slopes in the Three Gorges Area".