The improved Zhang–Suen refinement algorithm is used to refine the idea to obtain the road center line, and the vector road network in the study area is obtained. ![]() Then, the image expansion processing is performed on the road network raster image to complete the information loss problem. The trajectory points of the regional OD matrix are obtained by using the map API interface to generate the trajectory. Firstly, a large number of trajectory data are processed by hierarchical rasterization. Based on this, this study proposes a road network extraction method based on network map API and designs a vector road network based on an improved image-processing algorithm using trajectory data. ![]() Most existing research on the vector road network is based on GPS trajectory travel information extraction, and urban GPS trajectory data are large and difficult to obtain.
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