Traj-OPTICS is research software. If you make use of Traj-OPTICS in scientific publications, please cite it. The BibTeX reference is
@article{
deng2015scalable,
title={A scalable and fast OPTICS for clustering trajectory big data},
author={Deng, Ze and Hu, Yangyang and Zhu, Mao and Huang, Xiaohui and Du, Bo},
journal={Cluster Computing},
volume={18},
number={2},
pages={549--562},
year={2015},
publisher={Springer}
}