Spatial Temporal Queries and Triggers for Managing Moving Objects.
Minglin Deng, Fengli Zhang · 2002
Abstract. The development of spatiotemporal database systems is primarily motivated by applications which track and present mobile objects. An important aspect in this research area is the as-needed communication between moving objects and the database systems. Such communications with high efficiency are required by Internet applications as well as by location-based mobile applications. Another important trend is the evaluation of traveling patterns of moving objects and traffic patterns affecting the route planning. In this paper we will present a communication model in the context of moving object databases using spatial temporal triggers. We will also present a trigger evaluation approach using continues queries with special treatment for high performance. Based upon our existing work of 4D (2D geography plus time and uncertainty) trajectory model for moving objects we will propose a usage of PTL (past temporal logic) embedded with spatial operators to evaluate historical travel patterns of moving objects and traffic data. By incorporating historical patterns in the trigger condition, we have extended the knowledge power of the spatial temporal triggers. 1