Results 1 - 10 of 405

Trajectory Queries and Octagonsin Moving Object Databases \Lambda

by Hongjun Zhu, Jianwen Su, Oscar H. Ibarradepartment, Computer Science
"... ABSTRACT An important class of queries in moving object databases involves trajectories. We propose to divide trajectory predicates into topological and non-topological parts; extend the 9-intersection model of Egenhofer-Franzosa to a 3-step evaluation strategy for trajectory queries: a filter step, ..."
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ABSTRACT An important class of queries in moving object databases involves trajectories. We propose to divide trajectory predicates into topological and non-topological parts; extend the 9-intersection model of Egenhofer-Franzosa to a 3-step evaluation strategy for trajectory queries: a filter step

ABSTRACT Trajectory Queries and Octagons in Moving Object Databases ∗

by Hongjun Zhu, Jianwen Su, Oscar H. Ibarra
"... An important class of queries in moving object databases involves trajectories. We propose to divide trajectory predicates into topological and non-topological parts; extend the 9-intersection model of Egenhofer-Franzosa to a 3-step evaluation strategy for trajectory queries: a filter step, a refine ..."
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An important class of queries in moving object databases involves trajectories. We propose to divide trajectory predicates into topological and non-topological parts; extend the 9-intersection model of Egenhofer-Franzosa to a 3-step evaluation strategy for trajectory queries: a filter step, a

Evaluating trajectory queries over imprecise location data

by Xike Xie, Reynold Cheng, Man Lung Yiu - in SSDBM , 2012
"... Abstract. Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may not be prec ..."
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Abstract. Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may

Target Trajectory Querying in Wireless Sensor Networks

by Jin Zheng, Weijia Jia, Guojun Wang
"... Abstract—In this paper, we focus on the query problem of trajectory tracking of moving targets in a wireless sensor network. Our motivation is to design in-network storage and querying protocols to support queries for searching a given target signature in a low query latency, high query reliability, ..."
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Abstract—In this paper, we focus on the query problem of trajectory tracking of moving targets in a wireless sensor network. Our motivation is to design in-network storage and querying protocols to support queries for searching a given target signature in a low query latency, high query reliability

Shapes based Trajectory Queries for Moving Objects

by Bin Lin, Jianwen Su - Proceedings of ACM GIS , 2005
"... An interesting issue in moving objects databases is to find similar trajectories of moving objects. Previous work on this topic focuses on movement patterns (trajectories with time dimension) of moving objects, rather than spatial shapes (trajectories without time dimension) of their trajectories. I ..."
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An interesting issue in moving objects databases is to find similar trajectories of moving objects. Previous work on this topic focuses on movement patterns (trajectories with time dimension) of moving objects, rather than spatial shapes (trajectories without time dimension) of their trajectories

Universal Trajectory Queries for Moving Object Databases ∗

by unknown authors
"... In this paper, we consider a data model for uncertain trajectories of moving objects. In our model, the trajectory is a vector of uniform stochastic processes. We study “universal range queries ” which examine whether the spatial properties of being inside a region hold throughout an entire time int ..."
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In this paper, we consider a data model for uncertain trajectories of moving objects. In our model, the trajectory is a vector of uniform stochastic processes. We study “universal range queries ” which examine whether the spatial properties of being inside a region hold throughout an entire time

Scalable Evaluation of Trajectory Queries over Imprecise Location Data

by Xike Xie, Man L. Yiu, Reynold Cheng, Hua Lu Member
"... Abstract—Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may not be preci ..."
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Abstract—Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may

1Scalable Evaluation of Trajectory Queries over Imprecise Location Data

by Xike Xie, Man Lung Yiu, Reynold Cheng, Hua Lu Member
"... Abstract—Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may not be preci ..."
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Abstract—Trajectory queries, which retrieve nearby objects for every point of a given route, can be used to identify alerts of potential threats along a vessel route, or monitor the adjacent rescuers to a travel path. However, the locations of these objects (e.g., threats, succours) may

StreamMode FPGA Acceleration of Complex Pattern Trajectory Querying

by Roger Moussalli, Marcos R. Vieira, Walid Najjar, Vassilis J. Tsotras - in Proceedings 13th International Symposium on Spatial and Temporal Databases (SSTD
"... Abstract. The wide and increasing availability of collected data in the form of trajectory has lead to research advances in behavioral aspects of the monitored subjects (e.g., wild animals, people, vehicles). Using trajectory data harvested by devices, such as GPS, RFID and mobile devices, complex p ..."
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pattern queries can be posed to select trajectories based on specific events of interest. In this paper, we present a study on FPGA-based architectures processing complex patterns on streams of spatio-temporal data. Complex patterns are described as regular expressions over a spatial alphabet that can

Discovering similar multidimensional trajectories

by Michail Vlachos - In ICDE , 2002
"... We investigate techniques for analysis and retrieval of object trajectories in a two or three dimensional space. Such kind of data usually contain a great amount of noise, that makes all previously used metrics fail. Therefore, here we formalize non-metric similarity functions based on the Longest C ..."
Abstract - Cited by 260 (6 self) - Add to MetaCart
We investigate techniques for analysis and retrieval of object trajectories in a two or three dimensional space. Such kind of data usually contain a great amount of noise, that makes all previously used metrics fail. Therefore, here we formalize non-metric similarity functions based on the Longest
Results 1 - 10 of 405