| |  | Worboys, Michael | Event-oriented approaches to geographic phenomena read moreAbstract: This paper is about the information-theoretic foundations upon
which useful explanatory and predictive models of dynamic geographic
phenomena can be based. It traces the development over the last
decade or so of these foundations, from sequences of temporal snapshots,
through object life histories, to event chronicles. A crucial ontological
distinction is drawn between “things” and “happenings”, that is
between continuant and occurrent entities. Most of the work up to now
has focused on representing the evolution through time of geographic
things, whether objects or fields. This paper argues that happenings
should be upgraded to an equal status with things in dynamic geographic
representations, and suggests ways of doing this. The main
research focus of the paper is the application of an algebraic approach,
previously developed mainly in the context of computational processes,
to real-world happenings. It develops a pure process theory of space
and time, and demonstrates its applicability by providing an example
of the representation of motion of a vehicle through a region. The
paper concludes by noting some of the requirements for scaling this
approach to real-world dynamic scenarios, such as might be found, for
example, in the automation of coordination of disaster relief. | 2005 |
| | | P, Gatalsky | Exploratory spatio-temporal visualization: an analytical review read moreAbstract: Current software tools for visualization of spatio-temporal data, on the one hand, utilize the opportunities provided by modern computer technologies, on the other hand, incorporate the legacy from the conventional cartography. We have considered existing visualization-based techniques for exploratory analysis of spatio-temporal data from two perspectives: (1) what types of spatio-temporal data they are applicable to; (2) what exploratory tasks they can potentially support.The technique investigation has been based on an operational typology of spatio-temporal data and analytical tasks we specially devised for this purpose. The result of the study is a structured inventory of existing exploratory techniques related to the types of data and tasks they are appropriate for. This result is potentially helpful for data analysts-users of geovisualization tools: it provides guidelines for selection of proper exploratory techniques depending on the characteristics of data to analyze and the goals of analysis. At the same time the inventory as well as the suggested typology of tasks could be useful for tool designers and developers of various domain-specific geovisualization applications. The designers can, on the one hand, see what task types are insufficiently supported by the existing tools and direct their creative activities towards filling the gaps, on the other hand, use the techniques described as basic elements for building new, more sophisticated ones. The application developers can, on the one hand, use the task and data typology in the analysis of potential user needs, on the other hand, appropriately select and combine existing tools in order to satisfy these needs. | 2003 |
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