顾及形态特征约束的大范围道路中心线提取算法  

A large-scale road centerline extraction algorithm considering morphological feature constraints

作　　者：蔡昊琳 殷勇[2] 艾波[1] 吴创奇 郭沛沛[2] CAI Haolin;YIN Yong;AI Bo;WU Chuangqi;GUO Peipei(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Chinese Academy of Surveying&Mapping,Beijing 100036,China;Xi’an Institute of Prespecting and Mapping,Xi’an 710054,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]中国测绘科学研究院,北京100036 [3]西安市勘察测绘院,西安710054

出　　处：《测绘科学》2023年第2期177-184,共8页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41871375);国家重点研发计划项目(2018YFB2100704);中国测绘科学研究院基本科研业务费项目(AR2107,AR2108,AR2120)。

摘　　要：针对规则格网分块提取大范围路网(地级城市及以上)中心线算法在分块边界处极容易出现结构严重变形等问题,该文提出了一种顾及形态特征约束的大范围道路中心线分块提取算法。首先,基于道路面数据获取道路边线数据,计算其曲率,探测边线中的平直部分;然后,以边线中的平直部分作为分块基础,建立“转盘法”将大范围道路分割为多个小范围道路;最后,以分割的小范围道路作为处理单元,基于德洛内(Delaunay)三角网分区域进行中心线提取,并在分割边界处进行中心线拟合,完成大范围路网中心线提取,提高了中心线提取的准度和精度。以江苏省某市地理国情普查道路数据进行实验,结果表明,该文方法所提中心线形态均自然、光滑,且效率较规则分块方法提高2.5倍。To solve the problem that the centreline extraction algorithm of large-scale road network(prefecture-level cities and above)by regular grid block is very prone to serious structural deformation at the block boundary,a block extraction algorithm of large-scale road centerline considering morphological feature constraints is proposed in this paper.Firstly,the road sideline was obtained based on road polygon data,its curvature was calculated,and the straight part of the sideline was detected.Then,based on the detected straight part of the sideline,we developed the turntable method to divide the large-scale road into several small-scale roads;Finally,taking the segmented small-scale road as the processing unit,the centerline was extracted by segments based on Delaunay triangulation,and the centerline was fitted at the segmentation boundary to complete the centerline extraction of the large-scale road network.The accuracy and precision of centerline extraction are improved.The experiment was conducted with the road data of geographical national survey in a city of Jiangsu Province.The experimental results indicate that the centerline extracted in this method is natural and smooth,and the efficiency is 2.5times higher than that of regular blocks method.

关 键 词：大范围道路 中心线提取 分块策略 形态特征 

分 类 号：P283[天文地球—地图制图学与地理信息工程]