一种线面混合河网数据的网络拓扑化方法  

A network topological method for mixed data of line and surface

作　　者：宋丽丽[1] 胡海[1] 殷宗林 SONG Li-li(College of resources and environmental sciences,Wuhan university, Wuhan 430079, China)

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《国土与自然资源研究》2018年第6期53-58,共6页Territory & Natural Resources Study

基　　金：国家自然科学基金项目(41571395;41471328;41271443);国家重点研发计划:全息地图获取与位置信息聚合技术(2017YFB0503500)

摘　　要：大数据环境下的地理数据呈现出多源多尺度的特性。线面混合的多源河网数据适合于地图编绘、土地利用等应用,但是对于河网连通性分析、流域运输规划等依赖于河网网络拓扑的应用支持不足。本文通过分析混合河网数据的特点和其物理意义,提出一种基于数学形态学原理的河流中轴线提取方法。试验结果显示,该方法所提取的中轴线能保持良好的连续、光滑特性,对于原本的由线状河流栅格化得到的单线条河流也能够很好的保留,几何特征和拓扑特征完备。可直接对提取结果进行水文空间分析,为河网方面的相关研究提供了基础。Geographic data in the era of big data presents multisource and multi-scale characteristics.The multi-source river network data mixed by line surface is suitable for map editing,land use and other applications,but it is insufficient for the river network connectivity analysis,river basin transportation planning and other applications that rely on the river network topology.Based on the analysis of the characteristics and physical meaning of the mixed river network data,this paper proposes a method for extracting the central axis of the river based on the mathematical morphology principle.The test results show that the central axis extracted by the method is more continuous and smooth,and the single-line river obtained by the rasterization of the linear river can be well preserved,while the geometric features and topological features are complete.The hydrological space analysis can be directly carried out on the extraction results,which provides a basis for relevant research on the river network.

关 键 词：线面混合 中轴线 数学形态学 拓扑 地图代数 

分 类 号：P28[天文地球—地图制图学与地理信息工程]