摘要
针对以往基于DEM数据提取山脊线存在的平行效应或设置参数过多、自动化程度较低等问题,提出了一种基于流域边界分析的山脊线提取方法。实验结果表明,该方法能得到连续的山脊线,且与DEM的地形走向保持一致,避免了脊线段断续以及平坦地段出现平行效应等问题;相同密度的山脊线能与河网相互有效衔接,形成可概括地形的骨架线网络;不同汇流阈值的河网可获得不同面积大小的流域边界,从而形成详略程度不一的山脊线网络,可为地形综合研究提供了新的思路。
To solve the problems of parallel effect or too many parameters and low automation in extracting ridge line based on DEM data in the past,we proposed an extraction method of ridge line based on watershed boundary analysis in this paper.The experimental results show that this method can obtain continuous ridge lines,which are consistent with the terrain trend of DEM,avoiding the problems of ridge lines discontinuity and parallel effect in flat areas.At the same time,the same density ridge lines and river network can effectively link up to form a skeleton line network that can generalize terrain.The river networks with different confluence thresholds can obtain the watershed boundary of different areas and sizes,thus forming a ridge line network with varying degrees of detail,which can provide a new idea for comprehensive topographic research.
作者
黄萌萌
李灿
郭凤娇
HUANG Mengmeng;LI Can;GUO Fengjiao
出处
《地理空间信息》
2021年第9期19-22,37,I0001,共6页
Geospatial Information
基金
重庆市规划和自然资源科技资助项目(KJ-2019010)。
关键词
DEM分析
流域边界
山脊线提取
DEM analysis
watershed boundary
ridge line extraction
