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Deciphering flow clusters from large-scale free-floating bike sharing journey data: a two-stage flow clustering method

Author

Listed:
  • Wendong Chen

    (Southeast University)

  • Xize Liu

    (Southeast University)

  • Xuewu Chen

    (Southeast University)

  • Long Cheng

    (Southeast University)

  • Jingxu Chen

    (Southeast University)

Abstract

Extracting flow clusters consisting of many similar origin–destination (OD) trips is essential to uncover the spatio-temporal interactions and mobility patterns in the free-floating bike sharing (FFBS) system. However, due to occlusion and display clutter issues, efforts to identify inhomogeneous flow clusters from large journey data have been hampered to some extent. In this study, we present a two-stage flow clustering method, which integrates the Leiden community detection algorithm and the shared nearest-neighbor-based flow (SNN_flow) clustering method to efficiently identify flow clusters with arbitrary shapes and uneven densities. The applicability and performance of the method in detecting flow clusters are investigated empirically using the FFBS system of Nanjing, China as a case study. Some interesting findings can be drawn from the spatio-temporal patterns. For instance, the share of flow clusters used to meet the “first-/last-mile” demand at metro stations is reasonably high, both during the morning (71.85%) and evening (65.79%) peaks. Compared with the “first-/last-mile” flow clusters between metro stations and adjacent workplaces, the solution of the “first-/last-mile” flow clusters between metro stations and adjacent residences is more dependent on the FFBS system. In addition, we explored the shape and density distribution of flow clusters from the perspective of origin and destination points. The endpoint distribution characteristics demonstrate that the shape distribution of metro station point clusters is generally flatter and the spatial points within them are more concentrated than other sorts of point clusters. Our findings could help to better understand human movement patterns and home-work commute, thereby providing more rational and targeted decisions for allocating FFBS infrastructure resources.

Suggested Citation

  • Wendong Chen & Xize Liu & Xuewu Chen & Long Cheng & Jingxu Chen, 2025. "Deciphering flow clusters from large-scale free-floating bike sharing journey data: a two-stage flow clustering method," Transportation, Springer, vol. 52(1), pages 155-184, February.
  • Handle: RePEc:kap:transp:v:52:y:2025:i:1:d:10.1007_s11116-023-10415-y
    DOI: 10.1007/s11116-023-10415-y
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    References listed on IDEAS

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