Modeling uncertainty in spatiotemporal objects

Shokri, T 1, M. R. Delavar 1, M. R. Malek1 and A. U. Frank 1, 2
1 Center of Excellence in Geomatics Engineering  and Disaster Management, Dept. of Surveying and Geomatics Engineering,
Engineering Faculty, University of Tehran, Tehran, Iran
talashokri@geomatics.ut.ac.ir, mdelavar@ut.ac.ir, malek@ncc.neda.net.ir
2 Institute of Geoinformation and Cartography, TU WIEN, Austria
frank@geoinfo.tuwien.ac.at

Abstract
Spatiotemporal modeling has been received a great attention  in both the research and user community. Although considerable research efforts and valuable results do exists, many of the studies and proposed approaches are based on the assumption that objects have crisp boundaries, relationships among them are precisely defined, and accurate measurement of positions leads to error-free representations. This simplification is not sufficient for all applications and surely spatial objects, attributes, relationships, time  points, time periods, events and their changes may have uncertainty influencing spatiotemporal systems. In this paper, we first explore the semantics of spatial and temporal indeterminacy, to better understand their nature and behavior and show how  the fundamental modeling concepts of spatial objects, time  and events are influenced by indeterminacy representing that subsequently these concepts can be combined. Afterwards, we focus on the change of spatial objects and their geometry in time, then required models in the uncertainties mentioned have been developed and finally the methodology proposed to model indeterminate changes has been presented through a simulation case study.

Keywords: temporal uncertainty, uncertainty, temporal data quality, temporal GIS

In: Caetano, M. and Painho, M. (eds). Proceedings of the 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences, 5 – 7 July 2006, Lisboa, Instituto Geográfico Português

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