Transmission and visualization of large geographical maps |
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| Authors: | Liqiang Zhang Liang ZhangYingchao Ren Zhifeng Guo |
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| Institution: | a State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences, Beijing 100875, Chinab School of Geomatics and Urban Information, Beijing University of Civil Engineering and Architecture, Beijing 100044, China |
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| Abstract: | Transmission and visualization of large geographical maps have become a challenging research issue in GIS applications. This paper presents an efficient and robust way to simplify large geographical maps using frame buffers and Voronoi diagrams. The topological relationships are kept during the simplification by removing the Voronoi diagram’s self-overlapped regions. With the simplified vector maps, we establish different levels of detail (LOD) models of these maps. Then we introduce a client/server architecture which integrates our out-of-core algorithm, progressive transmission and rendering scheme based on computer graphics hardware. The architecture allows the viewers to view different regions interactively at different LODs on the network. Experimental results show that our proposed scheme provides an effective way for powerful transmission and manipulation of large maps. |
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| Keywords: | Large maps Voronoi diagram Out-of-core Progressive transmission |
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