Bulletin of Surveying and Mapping ›› 2023, Vol. 0 ›› Issue (1): 127-133.doi: 10.13474/j.cnki.11-2246.2023.0021

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A method of extracting road intersections using low frequency trajectory data

CHEN Weiliang, DU Jiusheng   

  1. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
  • Received:2022-02-14 Revised:2022-11-01 Published:2023-02-08

Abstract: In order to extract urban road intersections using low-frequency trajectory data, this paper designs a precise identification method of road intersections based on data preprocessing and clustering algorithm. Firstly, combined with the characteristics of the trajectory data, a heuristic filtering algorithm is used to clean the original data and eliminate redundant points and abnormal points. Then, according to the running rules of vehicles, a step by step algorithm for extracting road intersections is proposed to calculate the characteristic points of suspected road intersections. Finally, hierarchical density clustering algorithm (HDBSCAN) is used to cluster the selected track points and extract the centroid, which is the intersection of the road. Based on the data source of taxi driving track in Chengdu, the results show that,the algorithm can extract the intersection with an accuracy of 95.33%, a recall of 82.11% and F value of 88.46%. It can effectively and accurately identify the urban road intersection information, and has a certain application value in urban administration and traffic planning.

Key words: road intersection, turning point, convergence point, HDBSCAN, kernel density estimation, heuristic filtering

CLC Number: