| 3D Urban Visualization with LOD Techniques |
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| 引用本文： | Wang Yin-xing Li Bai-ying Liu Wen-bao Shi Xing-xi. 3D Urban Visualization with LOD Techniques[J]. 中国矿业大学学报(英文版), 2006, 16(1): 64-67 |
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| 作者姓名： | Wang Yin-xing Li Bai-ying Liu Wen-bao Shi Xing-xi |
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| 作者单位： | [1]College ofGeosciences, Shandong University of Science and Technology, Taian, Shandong 271019, China [2]Nanjing University of Science and Technology, Nanjing, Jiangsu 210000, China |
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| 摘 要： | In 3D urban visualization, large data volumes related to buildings are a major factor that limits the delivery and browsing speed in a web-based computer system. This paper proposes a new approach based on the level of detail （LOD） technique advanced in 3D visualization in computer graphics. The key idea of LOD technique is to generalize details of object surfaces without losing details for delivery and displaying objects. This technique has been successfully used in visualizing one or a few multiple objects in films and other industries. However, applying the technique to 3D urban visualization requires an effective generalization method for urban buildings. Conventional two-dimensional （2D） generalization method at different scales provides a good generalization reference for 3D urban visualization, Yet, it is difficult to determine when and where to retrieve data for displaying buildings. To solve this problem, this paper defines an imaging scale point and image scale region for judging when and where to get the fight data for visualization. The results show that the average response time of view transformations is much decreased.
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| 关 键 词： | 数字城市 LOD技术 可视化 图象处理 |
| 收稿时间： | 2005-10-26 |
| 修稿时间： | 2005-12-15 |
3D Urban Visualization with LOD Techniques |
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| Wang Yin-xing,Li Bai-ying,Liu Wen-bao,Shi Xing-xi. 3D Urban Visualization with LOD Techniques[J]. Journal of China University of Mining and Technology, 2006, 16(1): 64-67 |
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| Authors: | Wang Yin-xing Li Bai-ying Liu Wen-bao Shi Xing-xi |
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| Abstract: | In 3D urban visualization, large data volumes related to buildings are a major factor that limits the delivery and browsing speed in a web-based computer system. This paper proposes a new approach based on the level of de- tail (LOD) technique advanced in 3D visualization in computer graphics. The key idea of LOD technique is to gener- alize details of object surfaces without losing details for delivery and displaying objects. This technique has been successfully used in visualizing one or a few multiple objects in films and other industries. However, applying the technique to 3D urban visualization requires an effective generalization method for urban buildings. Conventional two-dimensional (2D) generalization method at different scales provides a good generalization reference for 3D ur- ban visualization. Yet, it is difficult to determine when and where to retrieve data for displaying buildings. To solve this problem, this paper defines an imaging scale point and image scale region for judging when and where to get the right data for visualization. The results show that the average response time of view transformations is much de- creased. |
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| Keywords: | digital city level of detail (LOD) generalization visualization image scale point/region |
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