Helical time representation to visualize return-periods of spatio-temporal events
Représentation hélicoïdale du temps pour la visualisation des périodes de retour des événements spatio-temporels
Résumé
Numerous methods have been developed to integrate temporal dimension in geovisualization environments. However, the
return-period of cyclic spatio-temporal events is still difficult to visualize in most time visualization tools used in
geovisualization, like timelines or timewheels. However, some temporal diagrams, which combine linear and cyclic aspects of
time, allow the visualization of the return-period of these events. These diagrams represent time by a chronological
succession of instances of a considered period. If this period and the events return-period are equal, the return-period can be
highlighted. Among these diagrams the time coil diagram proposed by Edsall and Peuquet represents time with a helix. These
diagrams are interactive and the represented period value can be modified to visualize the return-period of different cyclic
events. However, the values set to the period represented by the diagram are generally limited to usual periodic scales like
hours, days, weeks, or months. In this paper we propose a new geovisualization tool, based on the time coil diagram that
allows user to dynamically set any value of the represented period in the helical diagram. This new visualization tool enables
both to explore data and to find possible new cyclic events types as well as illustrating the return-period of any cyclic event
type.
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