Table 3.

The DBI of each density clustering algorithm.

Trajectory data volume	DBSCAN	TN-DBSCAN	GBA-DBSCAN	Slice-DBSCAN	Spark-DBSCAN	DBSCAN +
1000	0.23421	0.24617	0.42234	0.37566	0.19842	0.14897
1 W	0.24512	0.29452	0.45219	0.41202	0.19522	0.15242
10 W	0.39215	0.29921	0.41756	0.38875	0.17561	0.21435

The bold indicates that the algorithm proposed in this paper is better than other algorithms.