离散曲线演化及等高线剖分山脊山谷线提取  

A method of extracting terrain feature lines based on DCE and contour decomposition

作　　者：李秀娟[1] 郑先伟[1] 熊汉江[1] 

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,武汉430072

出　　处：《测绘科学》2015年第9期107-110,119,共5页Science of Surveying and Mapping

基　　金：国家863计划项目(2012AA12A405;2013AA12A203)

摘　　要：针对地貌图形中提取山脊山谷线的现有方法大都偏于随机性和局部性的问题,文章提出了一种基于离散曲线演化(DCE)和等高线凹凸包分割的提取方法:依据"整体抗噪、局部关联"的原则,将离散后的等高线数据进行全局DCE演化,标记点的整体重要性级别;然后对等高线进行凹凸包分割,并在局部凹凸包上根据"包点对应性"提取出重要性级别最高的点作为特征点;最后根据等高线间建立的拓扑关系,依据流水模型,在凹凸一致性、距离、方向角、重要性级别等因素的限制下对特征点进行连线。实验结果表明,该方法能较好地提取山脊山谷线,有效减少噪声的影响和特征点连接的错误。In order to solve the problem that th morphological maps are usually subject to randomn tracting the ridge and valley lines based on Discrete formation on each contour point was taken into con e methods of ess and locali Curve Evolu sideration to extracting terrain feature lines from geoity, the paper presented a method of extion and contour partition, the global inreduce the noises, and local relationship between feature points and contour shapes was built to improve the accuracy of final feature lines. Firstly, the DCE process for each contour line was performed and the relevance order for each contour point was marked; secondly the contour lines were segmented into a set of convex and concave parts and the feature points on each part were detected by the relevance order; then these feature points were linked into connected ridge and valley lines by the water movement model and the constraints of topology consistency, distance, direction and so on. Experimental results demonstrated that the feature points could be well extracted with reduced noises and matching errors finally.

关 键 词：离散曲线演化 等高线剖分 山脊线 山谷线 地形特征线 地形分析 

分 类 号：P283[天文地球—地图制图学与地理信息工程]