Spatio-Temporal Aggregations in Trajectory Data Warehouses
In this paper, the authors investigate some issues related to the design of a simple Data Warehouse (DW), storing several aggregate measures about trajectories of moving objects. They discuss the loading phase of their DW which has to deal with overwhelming streams of trajectory observations, possibly produced at different rates, and arriving in an unpredictable and unbounded way. Then, they focus on the measure presence, the most complex measure stored in their DW. Such a measure returns the number of trajectories that lie in a spatial region during a given temporal interval.