Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/9496
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dc.contributor.authorHAESEVOETS, Sofie-
dc.contributor.authorKUIJPERS, Bart-
dc.date.accessioned2009-04-16T13:09:42Z-
dc.date.issued2008-
dc.identifier.urihttp://hdl.handle.net/1942/9496-
dc.description.abstractIn spatial databases, incompatibilities often arise due to different choices of origin or unit of measurement(e.g centimeters versus inches). By representing and querying the data in an affine-invariant manner, we can avoid these incompatibilities. In practice, spatial(resp.,spatio-temporal) data is often represented as a finite union of triangles(resp.,moving triangles). As two arbitrary triangles are equal up to a unique affinity of the plane, they seem perfect candidates as basic units for an affine-invariant query language. We propose a so-called "triangle logic", a query language that is affine-generic and has triangles as basic elements. We show that this language has the same expressive power as the affine-generic fragment of first-order logic ove the reals on triangle databases. We illustrate that the proposed language is simple and intuitive. It can also serve as a first step towards a "moving-triangle logic" for spatio-temporal data.-
dc.language.isoen-
dc.publisherArXiv (Corr)-
dc.titleA triangle-based logic for affine-invariant querying of spatial and spatio-temporal data-
dc.typeResearch Report-
local.format.pages43-
local.bibliographicCitation.jcatR2-
dc.description.noteshttp://arxiv.org/abs/0810.5725-
dc.bibliographicCitation.oldjcatB4-
item.accessRightsOpen Access-
item.fulltextWith Fulltext-
item.fullcitationHAESEVOETS, Sofie & KUIJPERS, Bart (2008) A triangle-based logic for affine-invariant querying of spatial and spatio-temporal data.-
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