孙洪君, 杜道生, 李征航, 周勇前. 关于地球形状的三维可视化研究[J]. 武汉大学学报 ( 信息科学版), 2000, 25(2): 158-162.
引用本文: 孙洪君, 杜道生, 李征航, 周勇前. 关于地球形状的三维可视化研究[J]. 武汉大学学报 ( 信息科学版), 2000, 25(2): 158-162.
SUN Hongjun, DU Daosheng, LI Zhenghang, ZHOU Yongqian. Study on the 3D Visualization of Earth Figure[J]. Geomatics and Information Science of Wuhan University, 2000, 25(2): 158-162.
Citation: SUN Hongjun, DU Daosheng, LI Zhenghang, ZHOU Yongqian. Study on the 3D Visualization of Earth Figure[J]. Geomatics and Information Science of Wuhan University, 2000, 25(2): 158-162.

关于地球形状的三维可视化研究

Study on the 3D Visualization of Earth Figure

  • 摘要: 利用计算机图形学中的三维可视化理论和开放的OpenGL技术实现了地球形状的三维动态表达。研究和实现了全球数据组织、数据转换、数字地球三维建模、法向量计算以及矩形格网数据向三角网数据的快速转换。

     

    Abstract: Three dimensional earth figure is dynamically expressed by utilizing 3D visualization theory and OpenGL technique. In this paper, the global data structure and data transformation, modeling the digital earth, the method for calculating normal vector as well as the rapid transformation of global grid data into triangulated network data are studied and realized. The experimental data of global terrain is from The JGP95E 5' Global Topographic Database edited by The Defense Mapping Agency and NASA/Goddard Space Flight Center(GSFC), and the height above geodetic datum calculated by WDM94 model which was provided by WTUSM. Experimental results indicated that the mathematical model of global terrain and earth figure and their visualization methods are reasonable and practical. The visualization model created by means of the method mentioned above could be rotated and enlarged. Also the vertical scale could be changed in order to display the small undulation of the earth surface.

     

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