| 混合式球面退化剖分模型的设计与编码 |
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| 引用本文： | 李正国,包全福,张永生,靳彩娇.混合式球面退化剖分模型的设计与编码[J].测绘科学技术学报,2012(4):289-293. |
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| 作者姓名： | 李正国 包全福 张永生 靳彩娇 |
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| 作者单位： | 信息工程大学测绘学院;96351部队;95806部队;75719部队 |
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| 基金项目： | 对地观测技术国家测绘地理信息局重点实验室经费资助项目(K201102) |
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| 摘 要： | 为了解决球面退化四叉树格网(DQG)模型孔径较大、格网单元面积分布不均匀以及三角格网单元应用不完全四叉树剖分的问题,通过控制单元面积的思路设计了一种格网单元孔径更小、分布更均匀的四边形(中低纬地区)与三角形(高纬地区)的混合格网模型——混合式球面退化格网模型(MSDG);并对所有格网单元利用四叉树进行编码。通过对格网单元的几何属性统计分析发现,该格网模型的几何属性与DQG模型相比,其单元面积变化更小、分布更加均匀稳定。
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| 关 键 词： | 三角剖分 混合式球面退化格网 四元球面退化模型 全球离散格网 地址编码 |
Subdividing and Coding for Mix Spherical Degenerated Grid |
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| LI Zhengguo,BAO Quanfu,ZHANG Yongsheng,JIN Caijiao.Subdividing and Coding for Mix Spherical Degenerated Grid[J].Journal of Zhengzhou Institute of Surveying and Mapping,2012(4):289-293. |
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| Authors: | LI Zhengguo BAO Quanfu ZHANG Yongsheng JIN Caijiao |
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| Institution: | 1,4(1.Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China; 2.96351 Troops,Lanzhou 730100,China;3.95806 Troops,Beijing 100076,China; 4.75719 Troops,Wuhan 430074,China) |
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| Abstract: | To effectively solve the problems of large aperture and asymmetric units area of the geometry degradation quadtree grid(DQG) model as well as the triangular mesh inadequacy quadtree subdivision,a mixed split model of a quadrilateral with more uniform area(in the middle and low latitude) and triangles(in the high latitude) was designed by controlling the unit faces as the research objective.This degradation of split spherical hybrid model(MSDG) was utilized and the corresponding quadtree coding scheme was given.According to the analysis of the geometric properties of experimental unit subdivision,the result showed that the split model deformation,compared with the spherical geometry DQG model,owns more uniform and stable unit area. |
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| Keywords: | triangular mesh MSDG(Mixed Spherical Degradation Grid) degenerate quad tree grid discrete global gird system address coding |
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