Traditional road network extraction based on GPS trajectory focuses more on using vehicle-mounted GPS trajectory data to extract urban lane-level road network, while ignoring complex road information in small areas such as campus, community and scenic spots. Therefore, this paper proposed a method to extract complex road center line based on walking GPS trajectory data. Firstly the data was cleaned, then GPS trajectories were rasterized based on the distribution density of points, and zhang-suen rapid refinement algorithm was used to refine the grid network to obtain the road center line. Fina...
