融合Morphing变换的双线河向单线河转换方法  

A method for converting double line rivers to single line rivers by incorporating Morphing transformation

作　　者：赵彬彬[1,2] 刘广[1] 朱哲 谢建湘 ZHAO Binbin;LIU Guang;ZHU Zhe;XIE Jianxiang(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Engineering Laboratory of Spatial Information Technology of Highway Geological Disaster Early Warning in Hunan Province(Changsha University of Science&Technology),Changsha 410l14,China;Changsha Urban Planning Information Service Center,Changsha 410221,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙少410114 [2]长沙理工大学公路地质灾变预警空间信息技术湖南省工程实验室,长沙410114 [3]长沙市规划信息服务中心,长沙410221

出　　处：《测绘科学》2024年第12期204-214,共11页Science of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41301404);长沙理工大学公路地质灾变预警空间信息技术湖南省工程实验室开放基金项目(kfj160603)。

摘　　要：针对数字地图更新时双线河向单线河的转换问题,该文提出了一种融合Morphing变换的转换方法。首先,计算曲率、转角等参数获取河流拐点,将双线河分解为没有较大弯曲的河段;然后,依据极优对应算法辅以线性插值,获取各河段两侧岸线节点间映射关系,对河段岸线进行Morphing变换以提取中轴线,并以非约束边三角形为枢纽进行中轴线的衔接处理;接着,以双线河岸线为基础建立缓冲区,筛选满足转换宽度的待转换区域,将其转换为单线河并优化转换结果;最后,以两岸线与中轴线间的平均距离为基础,计算整体平均距离差、Pearson相关系数等指标对转换结果进行精度评价,并与已有中轴线提取方法作对比。实验结果表明,该方法转换效果较好,转换结果连续、平滑、精度较高,且兼顾双线河整体形态及其两侧岸线目标几何形状等细节特征。In this paper,a conversion method incorporating the Morphing transform was proposed for the problem of converting a double line river to a single line river when updating digital maps.Firstly,the river inflection points are obtained by calculating the curvature,corner and other parameters,and the double line river is decomposed into river segments without large bends;then,the mapping relationship between the nodes of the shorelines on both sides of each river segment is obtained by linear interpolation based on the optimal correspondence algorithm,the Morphing transform is performed on the shorelines of the river segments in order to extract the median,and the median is articulated by the unbounded side triangles as the pivot;Then,a buffer zone is established based on the double line river bank,and the area to be converted is screened to meet the conversion width,and then converted into a single line river to optimize the conversion results;Finally,based on the average distance between the two bank lines and the median axis,the conversion results are evaluated by calculating the overall average difference in distance,Pearson's correlation coefficient and other indexes to evaluate the accuracy of the conversion results,and are compared with the existing methods of extracting the median axis.The experimental results show that this method has a better conversion effect,and the conversion results are continuous,smooth,with high accuracy,and take into account the overall morphology of the double line river and the detailed features such as the target geometry of the two sides of the shoreline.

关 键 词：双线河 中轴线 河段 极优映射 非约束边三角形 缓冲区 

分 类 号：P283.7[天文地球—地图制图学与地理信息工程]