| 河网汇水区域的层次化剖分与地图综合 |
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| 引用本文： | 艾廷华,刘耀林,黄亚锋.河网汇水区域的层次化剖分与地图综合[J].测绘学报,2007,36(2):231-236,243. |
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| 作者姓名： | 艾廷华 刘耀林 黄亚锋 |
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| 作者单位： | 武汉大学,资源与环境科学学院,地理信息系统教育部重点实验室,湖北,武汉,430079;武汉大学,资源与环境科学学院,地理信息系统教育部重点实验室,湖北,武汉,430079;武汉大学,资源与环境科学学院,地理信息系统教育部重点实验室,湖北,武汉,430079 |
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| 基金项目： | 新世纪优秀人才支持计划(NCET-05-0623) |
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| 摘 要： | 对于具有网络状结构的河系数据的综合化简,判断河流分支在河网中的重要性需要考虑三个层次的结构信息:全局范围内的空间分布模式;局域环境下的分布密度;单条河流的几何特征。为提取这些结构化信息,本文基于网络分析运用Delaunay三角网模型建立了各级河流分支汇水区域的层次化剖分模型,其基本思想是将汇水区域划定当作“空间竞争”问题来求解,运用类似于Voronoi图的空间等剖分几何构造表达“袭水”过程,在各支流子系统内部及其环境之间通过Delaunay三角网骨架线确定汇水区域的分水岭。基于该层次剖分模型可计算河流分布密度、相邻河流间距、汇水范围及层次关系,进而推算出河系网中每一条河流的重要性系数,实现不同尺度下河流的综合选取。
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| 关 键 词： | Delaunay三角网 地图综合 河网 空间分析 |
| 文章编号： | 1001-1595（2007）02-0231-07 |
| 修稿时间： | 2005-09-072006-12-01 |
The Hierarchical Watershed Partitioning and Generalization of River Network |
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| AI Ting-hua,LIU Yao-lin,HUANG Ya-feng.The Hierarchical Watershed Partitioning and Generalization of River Network[J].Acta Geodaetica et Cartographica Sinica,2007,36(2):231-236,243. |
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| Authors: | AI Ting-hua LIU Yao-lin HUANG Ya-feng |
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| Institution: | Key Laboratory of Geographic Information System, School of Resource and Environment Sciences, Wuhan University, Wuhan 430079, China |
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| Abstract: | For the generalization of river network,the decision of role importance of river branches playing in catchment has to consider three aspects in different levels: the spatial distribution pattern at macro level,the distribution density at meso level and the individual geometric properties at micro level.To extract such structured information,this study tries to build the model of watershed hierarchical partitioning based on Delaunay triangulation.The determination of watershed area is regarded as a spatial competition process and through the partitioning similar to Voronoi diagram to obtain the basin polygon of each river branch within the coverage of one branch sub-network and its background the Delaunay triangulation is constructed and the skeleton is identified as the watershed boundary.Then a hierarchical relation is constructed to express the inclusion between different level watersheds.The hierarchical partitioning model can support to compute the parameters of distribution density,distance between neighbor rivers,the hierarchical watershed area,which are the pre-conditional parameters to determine the importance of river branch in the simplification and selection of river network.The study presents a method to select river network based on the watershed partitioning model. |
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| Keywords: | Delaunay triangulation map generalization river network spatial analysis |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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