Deep representation learning of activity trajectory similarity computation

Yifan Zhang, An Liu, Guanfeng Liu, Zhixu Li, Qing Li

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

6 Citations (Scopus)


Massive trajectory data stems from the prevalence of equipment supporting GPS and wireless communication technology. Based on these data, the computation of trajectory similarity has become a research hotspot in spatial database during recent years. The trajectory sampling problem caused by the different sampling strategies of the device has many negative effects on the similarity measurement. Although many recent studies have solved this problem by trajectory complements, these methods still have drawbacks because only spatial and temporal features are considered. Activity trajectory, with the development of LBSN (Location-based Social Network), endows traditional trajectory data with additional semantic information. In this paper, we fuse the spatio-temporal characteristics with extra activity information of the activity trajectory to solve the shortcomings in the process of trajectory complement. Specifically, we utilize vectors containing these three kinds of semantic information as the input of deep learning model for acquiring final trajectory representation, which is not only robust to low sampling, but also can capture implicit features in the trajectory. What's more, for the purpose of meeting the actual situation of network training, we propose a novel loss function based on the attention mechanism in natural language processing to distinguish these three kinds of information. Our framework, called At2vec, demonstrates better results than existing baselines when making extensive experiments on real trajectory databases.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE International Conference on Web Services, ICWS 2019 - Part of the 2019 IEEE World Congress on Services
EditorsElisa Bertino, Carl K. Chang, Peter Chen, Ernesto Damiani, Ernesto Damiani, Michael Goul, Katsunori Oyama
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages8
ISBN (Electronic)9781728127170
Publication statusPublished - Jul 2019
Event26th IEEE International Conference on Web Services, ICWS 2019 - Milan, Italy
Duration: 8 Jul 201913 Jul 2019

Publication series

NameProceedings - 2019 IEEE International Conference on Web Services, ICWS 2019 - Part of the 2019 IEEE World Congress on Services


Conference26th IEEE International Conference on Web Services, ICWS 2019


  • Activity Trajectory
  • Deep Learning
  • Trajectory Similarity

ASJC Scopus subject areas

  • Hardware and Architecture
  • Safety, Risk, Reliability and Quality
  • Business, Management and Accounting (miscellaneous)
  • Computer Networks and Communications
  • Information Systems and Management

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