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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Nonmaterialized Motion Information in Transport Networks
verfasst von : Hu Cao, Ouri Wolfson
Erschienen in: Database Theory - ICDT 2005
Verlag: Springer Berlin Heidelberg
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The traditional way of representing motion in 3D space-time uses a trajectory, i.e. a sequence of (x,y,t) points. Such a trajectory may be produced by periodic sampling of a Global Positioning System (GPS) receiver. The are two problems with this representation of motion. First, imprecision due to errors (e.g. GPS receivers often produce off-the-road locations), and second, space complexity due to a large number of samplings. We examine an alternative representation, called a nonmaterialized trajectory, which addresses both problems by taking advantage of the a priori knowledge that the motion occurs on a transport network.