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The Organization Management and 3D Visualization of Vector Data Based on Geographic Information Grid

Author: CaoXueFeng
Tutor: WanGang
School: PLA Information Engineering University
Course: Cartography and Geographic Information Engineering
Keywords: Geographic Information Grid 3D visualization of vector data Real-time rendering Spatial index
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 154
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Abstract


In this paper, on the basis of geographic information grid, organization and management of global vector data, spatial index, and the key technology of 3D visualization, to better meet people on a geographic information three-dimensional browsing, information query, spatial analysis and geographic information services needs. This paper studies the content is as follows: 1, comprehensively summarized the vector data grid management and three-dimensional visualization of geographic information grid, vector data model, spatial indexing, vector data visualization technology research clear and summarize the purpose and content of this study. 2, vector data the global grid organization management program, the program to maintain vector data integrity of information at the same time, the vector data management into a hybrid global grid encoding vector data meshing describes the process of coding from hybrid global grid cell is converted to vector data index. Using the Vector object-oriented data model organization of multi-resolution vector data, vector data to the a hybrid global grid conversion process in the projection and coordinate conversion method, as well as multi-resolution data generated by the simplification process. Quad-R tree to achieve a quick index of the vector data under the a hybrid global grid program. Vector data space indexing techniques detailed summary and analysis of the shortcomings and deficiencies of the quadtree and R-tree, and the characteristics of the hybrid global grid, Quad-R tree vector data indexing, expositions and Quad- R-tree indexing techniques. Vector data visualization technology a comprehensive summary of the vector data visualization technology into three categories: geometric mosaic, geometric layers and texture. Superimposed display on the multi-resolution terrain model for art, and discussed several special cases in geometric layers based processing and analysis based on the the texture methods of texture aliasing problems and suggest improvements. Using the improved geometry layers and textures to achieve a three-dimensional rendering of vector data in a multi-resolution terrain. 5, on the basis of the above research work, the development of geographic geographic information grid-based prototype system, the introduction of the system framework and module design, and the system displays different scale vector data part of the experimental results, which verify the vector data organization management and three-dimensional visualization of the correctness and effectiveness of the technology.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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