標題: On Discovery of Traveling Companions from Streaming Trajectories
作者: Tang, Lu-An
Zheng, Yu
Yuan, Jing
Han, Jiawei
Leung, Alice
Hung, Chih-Chieh
Peng, Wen-Chih
交大名義發表
National Chiao Tung University
公開日期: 2012
摘要: The advance of object tracking technologies leads to huge volumes of spatio-temporal data collected in the form of trajectory data stream. In this study, we investigate the problem of discovering object groups that travel together (i.e., traveling companions) from streaming trajectories. 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 streaming trajectories. The traveling buddies are micro-groups 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 trajectory stream with low cost. Based on traveling buddies, the system can discover companions without accessing the object details. The proposed methods are evaluated with extensive experiments on both real and synthetic datasets. The buddy-based method is an order of magnitude faster than baselines. It also achieves higher precision and recall in companion discovery.
URI: http://dx.doi.org/10.1109/ICDE.2012.33
http://hdl.handle.net/11536/134749
ISSN: 1084-4627
DOI: 10.1109/ICDE.2012.33
期刊: 2012 IEEE 28TH INTERNATIONAL CONFERENCE ON DATA ENGINEERING (ICDE)
起始頁: 186
結束頁: 197
Appears in Collections:Conferences Paper