Decentralized Data Fusion and Active Sensing with Mobile Sensors for Modeling and Predicting Spatiotemporal Traffic Phenomena

Jie Chen, Kian Hsiang Low, Colin Keng-Yan Tan, Ali Oran, Patrick Jalliet, John M. Dolan, and Gaurav S Sukhatme
Proceedings of the 28th Conference on Uncertainty in Artificial Intelligence (UAI-12), August, 2012.


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Abstract
The problem of modeling and predicting spatiotemporal traffic phenomena over an urban road network is important to many traffic applications such as detecting and forecasting congestion hotspots. This paper presents a decentralized data fusion and active sensing (D2FAS) algorithm for mobile sensors to actively explore the road network to gather and assimilate the most informative data for predicting the traffic phenomenon. We analyze the time and communication complexity of D2FAS and demonstrate that it can scale well with a large number of observations and sensors. We provide a theoretical guarantee on its predictive performance to be equivalent to that of a sophisticated centralized sparse approximation for the Gaussian process (GP) model: The computation of such a sparse approximate GP model can thus be parallelized and distributed among the mobile sensors (in a Google-like MapReduce paradigm), thereby achieving efficient and scalable prediction. We also theoretically guarantee its active sensing performance that improves under various practical environmental conditions. Empirical evaluation on real-world urban road network data shows that our D2FAS algorithm is significantly more time-efficient and scalable than state-of-the-art centralized algorithms while achieving comparable predictive performance.

Keywords
multi-sensor networks, mobile sensors, traffic modeling, Gaussian process

Notes
Number of pages: 13

Text Reference
Jie Chen, Kian Hsiang Low, Colin Keng-Yan Tan, Ali Oran, Patrick Jalliet, John M. Dolan, and Gaurav S Sukhatme, "Decentralized Data Fusion and Active Sensing with Mobile Sensors for Modeling and Predicting Spatiotemporal Traffic Phenomena," Proceedings of the 28th Conference on Uncertainty in Artificial Intelligence (UAI-12), August, 2012.

BibTeX Reference
@inproceedings{Low_2012_7201,
   author = "Jie Chen and Kian Hsiang Low and Colin Keng-Yan Tan and Ali Oran and Patrick Jalliet and John M Dolan and Gaurav S Sukhatme",
   title = "Decentralized Data Fusion and Active Sensing with Mobile Sensors for Modeling and Predicting Spatiotemporal Traffic Phenomena",
   booktitle = "Proceedings of the 28th Conference on Uncertainty in Artificial Intelligence (UAI-12)",
   month = "August",
   year = "2012",
}