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Design and Implementation of a Trajectory-based Index Structure for Moving Objects on a Spatial Network  

Um, Jung-Ho (전북대학교 컴퓨터공학과)
Chang, Jae-Woo (전북대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Databases / v.35, no.2, 2008 , pp. 169-181 More about this Journal
Abstract
Because moving objects usually move on spatial networks, efficient trajectory index structures are required to achieve good retrieval performance on their trajectories. However, there has been little research on trajectory index structures for spatial networks such as FNR-tree and MON-tree. But, because FNR-tree and MON-tree are stored by the unit of the moving object's segment, they can't support the whole moving objects' trajectory. In this paper, we propose an efficient trajectory index structure, named Trajectory of Moving objects on Network Tree(TMN Tree), for moving objects. For this, we divide moving object data into spatial and temporal attribute, and preserve moving objects' trajectory. Then, we design index structure which supports not only range query but trajectory query. In addition, we divide user queries into spatio-temporal area based trajectory query, similar-trajectory query, and k-nearest neighbor query. We propose query processing algorithms to support them. Finally, we show that our trajectory index structure outperforms existing tree structures like FNR-Tree and MON-Tree.
Keywords
Spatial Network database; trajectory; Index Structure;
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