Fast Organization and Expression of Multi-sheet Electronic Map Based on OpenGL Technology

  • Institute of Geography Spatial Information, Information Engineering University, Zhengzhou 450052, China

Received date: 2013-02-18

  Revised date: 2013-03-29

  Online published: 2013-08-08


The quality of map symbolization and the display speed of the electronic map are always the hot issues for the cartographers. The availability of the electronic map mainly includes the effectiveness, efficiency and user subjective satisfaction. Currently, the map symbolization quality can meet to the basic needs of various user groups, but electronic map rendering speed has affected the feelings of map users. Since the electronic map involving large volumes of data, it needs a relatively long period of time to respond to user's operation, causing the user to generate anxiety and dissatisfaction because of waiting, so it is difficult to give map users more smooth operating experience. For the problem of improving the rendering speed, current studies mainly focused on data block processing, hierarchical processing and the establishment of efficient indexing model to improve the efficiency of electronic map display by reducing the amount of map data. Based on analysis and summary on the improved multi-sheet electronic map rendering speed, this research compares the characteristics between GDI and OpenGL. When we use GDI and OpenGL to draw 2D entities at the same time, if the number of primitive is small, the difference is not large. But if the number of primitive is large and primitives are static, the rendering speed using OpenGL is far faster than the GDI, because OpenGL can use display list technology, texture mapping and vertex data technology. In this paper we presented and implemented a symbolic method in three-dimensional interfaces for the different types of features. It proposes the way of expression and organization of multi-scale data in the three-dimensional space through multithreading technology and memory pool. The experimental results show that it is able to achieve the symbolization of point feature, line feature and area feature. And roaming, zooming in multi-sheet electronic map data, screen rendering speed remain at more than 17 frames per second. So, using methods and techniques mentioned in this paper can improve rendering speed and ensure the good interaction effect between user and map.

Cite this article

ZHOU Xiao-Jun, WANG Guang-Xia, JIA Jing, WANG Fu-Jiang . Fast Organization and Expression of Multi-sheet Electronic Map Based on OpenGL Technology[J]. Journal of Geo-information Science, 2013 , 15(4) : 491 -497 . DOI: 10.3724/SP.J.1047.2013.00491


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