地形特征线的判定因子及提取算法  

Decision factors and extraction algorithm of terrain feature lines

作　　者：练靖文 康建荣 崔腾飞 王丹萍 Lian Jingwen;Kang Jianrong;Cui Tengfei;Wang Danping(School of Geography,Geomatics&Planning,Jiangsu Normal University,Xuzhou 221116,Jiangsu,China)

机构地区：[1]江苏师范大学地理测绘与城乡规划学院,江苏徐州221116

出　　处：《江苏师范大学学报（自然科学版）》2023年第3期72-75,共4页Journal of Jiangsu Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52074133);江苏省研究生科研与实践创新计划项目(KYCX21_2629)。

摘　　要：地形特征线构成了地形起伏变化的骨架线,其中的山脊线和山谷线对于地形地貌的研究具有重要意义.根据山脊线和山谷线的特性,首先,提出确定地形特征线起点的4个判定因子(张角因子α、距离因子S、标志因子β_(1)和β_(2)),基于DP算法所提取的地形特征点判别特征线起点.其次,提出一种将特征点判断与方位加权法相结合的地形特征线提取算法,以特征点为中心把4个象限划分成若干个区域,通过一定的判断准则从区域内提取出符合条件的点,以此法来追踪山脊线和山谷线.编写相应程序验证所提算法的正确性和有效性,结果表明,当α<165°、S<6倍等高距、β_(1)=1且β_(2)=0时,所提取的地形特征线与实际地形相符合.Terrain feature lines constitute the skeleton lines of terrain fluctuations,and the ridge lines and valley lines are of great significance for the study of terrain and geomorphology.According to the characteristics of ridge and valley lines,firstly,four decision factors(tensor factor α,distance factor S,marker factors β_(1),β_(2))to determine the starting point of terrain feature lines are proposed.Based on the terrain feature points extracted by the DP algorithm,the starting point of the feature line is determined.Secondly,a terrain feature line extraction algorithm that combines feature point judgment with azimuth weighting method is proposed.Using feature points as the centers,the four quadrants are divided into several regions,and qualified points are extracted from the region using certain judgment criteria to track ridge and valley lines.Write corresponding programs to verify the correctness and effectiveness of the proposed algorithm,and the results show that whenα<165°,S<6 times contour distance,β_(1)=1,and β_(2)=0,the extracted terrain feature lines match the actual terrain.

关 键 词：地形特征线 判定因子 骨架线 矢量等高线 方位加权法 自动提取 

分 类 号：P208[天文地球—地图制图学与地理信息工程]