OLAP for Trajectories

Authors:
Oliver Baltzer;Frank Dehne;Susanne Hambrusch;Andrew Rau-Chaplin
Affiliations:
Dalhousie University, Halifax, Canada;Carleton University, Ottawa, Canada;Purdue University, West Lafayette, IN, USA;Dalhousie University, Halifax, Canada
Venue:
DEXA '08 Proceedings of the 19th international conference on Database and Expert Systems Applications
Year:
2008

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Abstract

In this paper, we present an OLAP framework for trajectories of moving objects. We introduce a new operator GROUP_TRAJECTORIES for group-by operations on trajectories and present three implementation alternatives for computing groups of trajectories for group-by aggregation: group by overlap, group by intersection, and group by overlap and intersection. We also present an interactive OLAP environment for resolution drill-down/roll-up on sets of trajectories and parameter browsing. Using generated and real life moving data sets, we evaluate the performance of our GROUP_TRAJECTORIES operator. An implementation of our new interactive OLAP environment for trajectories can be accessed at http://OLAP-T.cgmlab.org.