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Uncertainty in Spatial Trajectories

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Computing with Spatial Trajectories

Abstract

This chapter presents a systematic overview of the various issues and solutions related to the notion of uncertainty in the settings of moving objects trajectories. The sources of uncertainty in this context are plentiful: from the mere fact that the positioning devices are inherently imprecise, to the pragmatic aspect that, although the objects are moving continuously, location-based servers can only be updated in discrete times. Hence come the problems related to modelling and representing the uncertainty in Moving Objects Databases (MOD) and, as a consequence, problems of efficient algorithms for processing various spatio-temporal queries of interest. Given the ever-presence of uncertainty since the dawn of philosophy through modern day nano-level science, after a brief introduction, we present a historic overview of the role of uncertainty in parts of the evolution of the human thought in general, and Computer Science (CS) and databases in particular, which are relevant to this chapter. The focus of this chapter, however, will be on the impact that capturing the uncertainty in the syntax of the popular spatio-temporal queries has on their semantics and processing algorithms. We also consider the impact of different models in different settings – e.g., free motion; road-network constrained motion – and discuss the main issues related to exploiting such semantic dimension( s) for efficient query processing.

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Trajcevski, G. (2011). Uncertainty in Spatial Trajectories. In: Zheng, Y., Zhou, X. (eds) Computing with Spatial Trajectories. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1629-6_3

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