基于网络地图API的城市级轨迹生成和路网提取方法

City Level Trajectory Generation and Road Network Extraction Method Based on Web Map API

关于矢量路网的现有研究大多是基于GPS轨迹的出行信息提取,但城市级的GPS轨迹数据具有庞大且难以获取的特点。基于此,本文提出一种基于网络地图API的城市级轨迹生成和路网提取方法。首先,通过栅格化研究区得到起点终点矩阵(OD矩阵),利用地图API接口来得到区域OD矩阵的轨迹点从而生成轨迹;其次,利用网络轨迹栅格化和栅格数据矢量化来得到研究区域的矢量路网;最后,以河南省永城市为例,提取了永城城区和全域的路网,与网络地图的路网进行对比。结果显示轨迹生成和路网提取效果良好,提取精度达到92.65%,验证了该方法的有效性。

Most of the existing researches on vector road network are based on the extraction of GPS tracks,but the GPS trajectory data at city level is huge and difficult to be obtained.Based on this,a method based on network map API was proposed to generate the trajectory and extract the road network.The research area is rasterized to obtain the starting point and end point matrix(OD matrix),and the trajectory points of the regional OD matrix are obtained by using the map API interface to generate the trajectory.Then the trajectory is transformed into raster and the raster data is vectorized to obtain the vector road network of the study area.Finally,the urban area and the whole network of Yongcheng in Henan are extracted.The road network extracted and the road network map are compared.The results show that the trajectory generation and road network extraction are effective,and the extraction accuracy reaches 92.65%,which verifies the effectiveness of the proposed method.