City Research Online

Abstract

Continuing advances in modern data acquisition techniques result in rapidly growing amounts of geo-referenced data about moving objects and in emergence of new data types. We define episodic movement data as a new complex data type to be considered in the research fields relevant to data analysis. In episodic movement data, position measurements may be separated by large time gaps, in which the positions of the moving objects are unknown and cannot be reliably reconstructed. Many of the existing methods for movement analysis are designed for data with fine temporal resolution and cannot be applied to discontinuous trajectories. We present an approach utilizing Visual Analytics methods to explore and understand the temporal variation of spatial situations derived from episodic movement data by means of spatio-temporal aggregation. The situations are defined in terms of the presence of moving objects in different places and in terms of flows (collective movements) among the places. The approach, which combines interactive visual displays with clustering of the spatial situations, is presented by example of a real dataset collected by Bluetooth sensors.

Publication Type:	Article
Additional Information:	The final publication is available at Springer via http://dx.doi.org/10.1007/s13218-
Publisher Keywords:	Sammon’s Mapping, Episodic Movement, Visual Analytic, Map Matching, Visual Analytic Approach, Complementary Colour, Weighted Directed Graph, Cluster Centre, Colour Space, Bluetooth Sensor, Collective Movement, Mobile Device, Mobile Phone
Subjects:	Q Science
Departments:	School of Science & Technology School of Science & Technology > Computer Science > giCentre

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