I. INTRODUCTION  
II. BIBLIOMETRIC ANALYSIS  
III. PRELIMINARIES  
IV. DATA PRE-PROCESSING FOR VESSEL TRAJECTORY CLUSTERING  
V. DISTANCE-BASED VESSEL TRAJECTORY SIMILARITY MEASUREMENT  
VI. UNSUPERVISED ALGORITHMS FOR VESSEL TRAJECTORY CLUSTERING  
VII. APPLICATIONS OF VESSEL TRAJECTORY CLUSTERING  
VIII. EXPERIMENTAL EVALUATION  
IX. DISCUSSION AND CONCLUSION