| 基于球面DQG的数字高程建模算法与可视化表达 |
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| 引用本文： | 崔马军,赵学胜,孙乾坤,高彦丽.基于球面DQG的数字高程建模算法与可视化表达[J].地理与地理信息科学,2008,24(5). |
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| 作者姓名： | 崔马军 赵学胜 孙乾坤 高彦丽 |
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| 作者单位： | 中国矿业大学,北京,资源与安全工程学院,北京,100083 |
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| 摘 要： | 为有效解决经纬度格网与四元三角网(Quaternary Triangular Mesh,QTM)在全球地形建模方面存在的不足,根据球面DQG(Degenerate Quadtree Grid)的几何结构特点,选择双线性多项式内插方法进行格网点高程内插,给出基于球面DQG的DEM建模算法与效率分析,并应用美国地质调查局提供的GTOPO30全球地形数据进行相关实验。结果表明:全球DEM建模时,DQG所需的格网数是经纬度格网或QTM的2/3左右,且可视化操作(图形放大、缩小及漫游等)时画面平滑、流畅,没有抖动。
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| 关 键 词： | 退化四叉树格网 地址码 高程内插 坐标转换 数字高程模型 |
Algorithm and Visualization of Digital Elevation Modeling Based on Spherical DQG |
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| CUI Ma-jun,ZHAO Xue-sheng,SUN Qian-kun,GAO Yan-li.Algorithm and Visualization of Digital Elevation Modeling Based on Spherical DQG[J].Geography and Geo-Information Science,2008,24(5). |
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| Authors: | CUI Ma-jun ZHAO Xue-sheng SUN Qian-kun GAO Yan-li |
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| Abstract: | To overcome the deficiency in global terrain modeling of both Longitude-Latitude Grid and Quaternary Triangular Mesh(QTM),bilinear-polynomial interpolating method is selected to get the elevation of DQG(Degenerate Quadtree Grid) nodes,the efficiency analyzing and algorithm of digital elevation modeling are given in details.In the end,experiment and analy-sis are implemented with the GTOPO30 data of USGS.The results show that the DEM grids number is about 2/3 of both Lon-gitude-Latitude Grid and QTM at the same level,and the effect of visualization operations(zooming in,zooming out and crui-sing and so on) are good. |
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| Keywords: | degenerate quadtree grid address code elevation interpolating coordinates translating digital elevation modeling |
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