Fig. 1. Comparison diagram of OD flow spatial similarity relationship

Fig. 2. OD flow time similarity relationship judgment

Fig. 3. Relationship between ratio and sim

Fig. 4. Flow chart of step-by-step merge strategy

Fig. 5. Comparison diagram of clusters' consolidation condition

Fig. 6. Clusters' merging order and results under different clustering methods

Fig. 7. Comparison of spatial ranges of flow clusters under different values of parameter k

Fig. 8. Comparison of flow clusters under different values of time parameter。。。

Fig. 9. Chengdu's OD flow clusters of a large number at early rush hour and late rush hour

Fig. 10. Top five flow clustersof New YorkCitytaxi data discovered by our method

Fig. 11. Centers of flow clusters of New York City taxi data with different volumes。。。

Fig. 12. Top five flow clustersof New York City taxi data discovered by Gao's method