A framework of traveling companion discovery on trajectory data streams
Abstract
The advance of mobile technologies leads to huge volumes of spatio-temporal data collected in the form of trajectory data streams. In this study, we investigate the problem of discovering object groups that travel together (i.e., traveling companions ) from trajectory data streams. Such technique has broad applications in the areas of scientific study, transportation management, and military surveillance. To discover traveling companions, the monitoring system should cluster the objects of each snapshot and intersect the clustering results to retrieve moving-together objects. Since both clustering and intersection steps involve high computational overhead, the key issue of companion discovery is to improve the efficiency of algorithms. We propose the models of closed companion candidates and smart intersection to accelerate data processing. A data structure termed traveling buddy is designed to facilitate scalable and flexible companion discovery from trajectory streams. The traveling buddies are microgroups of objects that are tightly bound together. By only storing the object relationships rather than their spatial coordinates, the buddies can be dynamically maintained along the trajectory stream with low cost. Based on traveling buddies, the system can discover companions without accessing the object details. In addition, we extend the proposed framework to discover companions on more complicated scenarios with spatial and temporal constraints, such as on the road network and battlefield. The proposed methods are evaluated with extensive experiments on both real and synthetic datasets. Experimental results show that our proposed buddy-based approach is an order of magnitude faster than the baselines and achieves higher accuracy in companion discovery.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 01, 2013
- Source ID
- 10.1145/2542182.2542185
Entities
People
- Alice Leung
- Jiawei Han
- Jing Yuan
- Lu-an Tang
- Thomas LaPorta
- Wen-chih Peng
- Yu Zheng
Organizations
- BBN Technologies
- Division of Computer and Network Systems
- Division of Computing and Communication Foundations
- Division of Information and Intelligent Systems
- Microsoft
- National Chiao Tung University
- Pennsylvania State University
- United States Army Research Laboratory
- University of Illinois Urbana–Champaign