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Online clustering of streaming trajectories

Frontiers of Computer Science volume 12, pages 245–263 (2018)Cite this article

Abstract

With the increasing availability of modern mobile devices and location acquisition technologies, massive trajectory data of moving objects are collected continuously in a streaming manner. Clustering streaming trajectories facilitates finding the representative paths or common moving trends shared by different objects in real time. Although data stream clustering has been studied extensively in the past decade, little effort has been devoted to dealing with streaming trajectories. The main challenge lies in the strict space and time complexities of processing the continuously arriving trajectory data, combined with the difficulty of concept drift. To address this issue, we present two novel synopsis structures to extract the clustering characteristics of trajectories, and develop an incremental algorithm for the online clustering of streaming trajectories (called OCluST). It contains a micro-clustering component to cluster and summarize the most recent sets of trajectory line segments at each time instant, and a macro-clustering component to build large macro-clusters based on micro-clusters over a specified time horizon. Finally, we conduct extensive experiments on four real data sets to evaluate the effectiveness and efficiency of OCluST, and compare it with other congeneric algorithms. Experimental results show that OCluST can achieve superior performance in clustering streaming trajectories.

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Acknowledgements

Our research was supported by the National Key Research and Development Program of China (2016YFB1000905), the National Natural Science Foundation of China (NSFC) (Grant Nos. 61702423, 61370101, 61532021, U1501252, U1401256 and 61402180), Natural Science Foundation of the Education Department of Sichuan Province (17ZA0381 and 13ZA0015), China West Normal University Special Foundation of National Programme Cultivation (16C005), and Meritocracy Research Funds of China West Normal University (17YC158).

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Authors and Affiliations

  1. School of Data Science and Engineering, East China Normal University, Shanghai, 200062, China

    Jiali Mao, Qiuge Song, Cheqing Jin, Zhigang Zhang & Aoying Zhou

  2. School of Computing, China West Normal University, Nanchong, 637009, China

    Jiali Mao

Authors
  1. Jiali Mao
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  2. Qiuge Song
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  3. Cheqing Jin
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  4. Zhigang Zhang
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  5. Aoying Zhou
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Corresponding author

Correspondence to Jiali Mao.

Additional information

Jiali Mao is an associate professor at China West Normal University, China. She is currently working toward the PhD degree in the School of Data Science and Engineering, East China Normal University, China. Her current research interests include big data analysis and location-based services.

Qiuge Song received her bachelor’s degree in computer science and technology from Nankai University, China in 2014. She is a graduate student in the School of Software Engineering, East China Normal University, China. Her current research interests include data mining and location-based services.

Zhigang Zhang is currently working toward the PhD degree at the School of Data Science and Engineering, East China Normal University, China. His research interests include location-based services, spatio-temporal data management, and distributed computing.

Aoying Zhou is a professor of computer science at East China Normal University (ECNU), China, as well as the dean of the School of Data Science and Engineering (DaSE), ECNU. His research interests include web data management, data management for data-intensive computing, inmemory cluster computing, benchmarking for big data, and performance.

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Mao, J., Song, Q., Jin, C. et al. Online clustering of streaming trajectories. Front. Comput. Sci. 12, 245–263 (2018). https://doi.org/10.1007/s11704-017-6325-0

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