| 顾及拓扑一致性的水系三维曲线化简 |
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| 引用本文： | 刘民士,龙毅,费立凡.顾及拓扑一致性的水系三维曲线化简[J].测绘学报,2016,45(4):494-501. |
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| 作者姓名： | 刘民士 龙毅 费立凡 |
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| 作者单位： | 1. 南京师范大学地理科学学院, 江苏南京 210023;2. 虚拟地理环境教育部重点实验室, 江苏南京 210023;3. 江苏省地理信息资源开发与利用协同创新中心, 江苏南京 210023;4. 滁州学院地理信息与旅游学院, 安徽滁州 239000;5. 安徽省地理信息集成应用协同创新中心, 安徽滁州 239000 |
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| 基金项目： | 国家自然科学基金(41171350;41301514;41501496);滁州学院校级培育项目(2014PY03)~~ |
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| 摘 要： | 鉴于常规曲线化简方法应用于水系曲线化简时难以顾及水系要素的三维特征及其拓扑关系,本文提出了一种顾及拓扑一致性的水系三维曲线化简方法。该方法首先对D-P算法进行三维扩展,实现水系中单条河流三维曲线化简,然后构建水系树结构表达其拓扑关系,最后按照水系树的层次顺序依次进行河流曲线化简和干流与支流的拓扑关系重构。试验结果表明,该方法化简精度高,既能保持水系的三维形态特征,又能保证河流交汇处的拓扑一致性。
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| 关 键 词： | D-P算法 拓扑关系 三维曲线化简 水系化简 |
| 收稿时间： | 2015-06-01 |
| 修稿时间： | 2016-01-06 |
Line Simplification of Three-dimensional Drainage Considering Topological Consistency |
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| LIU Minshi,LONG Yi,FEI Lifan.Line Simplification of Three-dimensional Drainage Considering Topological Consistency[J].Acta Geodaetica et Cartographica Sinica,2016,45(4):494-501. |
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| Authors: | LIU Minshi LONG Yi FEI Lifan |
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| Institution: | LIU Minshi;LONG Yi;FEI Lifan;School of Geography Science,Nanjing Normal University;Key Laboratory of Virtual Geographic Environment of Ministry of Education;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application;School of Geographic Information and Tourism,Chuzhou University;Anhui Center for Collaborative Innovation in Geographical Information Integration and Application; |
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| Abstract: | In view of the fact that drainage line simplification using conversional methods is usually hard to keep the three-dimensional characteristics and topological relationships, this paper proposes a new method of three-dimensional drainage line simplification which maintains topological consistency. It firstly expends the conversional D-P algorithm to three-dimensional in order to keep three-dimensional characteristics during the simplification. Then it constructs tree structures for drainage lines to express their topological relations. Finally, it simplifies river lines and reconstructs topological relations of main streams and their branches according to the hierarchical order of water system tree. The experimental results show that this method has a higher accuracy in simplification and can maintain not only three-dimensional shape characteristics of water system but also the topological consistency at river confluences. |
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| Keywords: | D-P algorithm topological relationship three-dimensional line simplification water system simplification |
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