Abstract
AbstractSeveral strategies have been proposed for join processing in spatial data, including spatial data streams. However, these strategies do not consider variations in the arrival time of objects. Some streams have a period that differs from others. Others transmit objects based on certain events, which are considered aperiodic events. These factors can affect the accuracy of the spatial join result. Therefore, this paper studies the effect of varying object arrival times on several previously proposed strategies, are adapted for both varying periodic and aperiodic (i.e., event-based) spatial streams. An empirical evaluation and comparison versus the original strategies is performed to determine how varying the arrival of spatial objects affects the accuracy of the spatial join results. Results show that in many cases, at least 90% of the result obtained by the original strategy is still obtained by the adapted strategy. In several cases - in particular in the aperiodic situation - more accurate results are obtained by the adapted strategy.KeywordsSpatial data streamsSpatial joinsPeriodicAperiodicPerformance
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