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Context-dependent 'near' and 'far' in spatial databases via supervaluation
Umeå University, Faculty of Science and Technology, Department of Computing Science.
Umeå University, Faculty of Science and Technology, Department of Computing Science.
2013 (English)In: Data & Knowledge Engineering, ISSN 0169-023X, E-ISSN 1872-6933, Vol. 86, 295-305 p.Article in journal (Refereed) Published
Abstract [en]

Often we are interested to know what is 'near' and what is 'far' in spatial databases. For instance we would like a hotel 'near' the beach, but 'far' from the highway. It is not always obvious how to answer such nearness questions by reducing them to their crisp counterparts 'nearer' or 'nearest'. Thus we confront the vague and context-dependent relation of near (and far). Our approach follows a supervaluation tradition with a limited representation of context. The method is tractable, learnable and directly suitable for use in natural language interfaces to databases. The approach is based on logic programs supervaluated over a set of context-dependent threshold parameters. Given a set of rules with such unconstrained threshold parameters, a fixed parameter tractable algorithm finds a setting of parameters that are consistent with a training corpus of context-dependent descriptions of 'near' and 'far' in scenes. The results of this algorithm may then be compiled into view definitions which are accessed in real-time by natural language interfaces employing normal, non-exotic query answering mechanisms. 

Place, publisher, year, edition, pages
2013. Vol. 86, 295-305 p.
Keyword [en]
Vagueness, Spatial databases, Natural language interfaces, Supervaluation, OpenStreetMaps
National Category
Computer Science
Identifiers
URN: urn:nbn:se:umu:diva-79044DOI: 10.1016/j.datak.2013.02.004ISI: 000320353700015OAI: oai:DiVA.org:umu-79044DiVA: diva2:704204
Available from: 2014-03-11 Created: 2013-08-06 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Natural language interfaces over spatial data: investigations in scalability, extensibility and reliability
Open this publication in new window or tab >>Natural language interfaces over spatial data: investigations in scalability, extensibility and reliability
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Alternative title[sv]
Naturliga-språkgränssnitt över rumsliga data : undersökningar i skalbarhet, utbyggbarhet och tillförlitlighet
Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2013. 97 p.
Series
UMINF, ISSN 0348-0542 ; 13.22
National Category
Language Technology (Computational Linguistics)
Identifiers
urn:nbn:se:umu:diva-87705 (URN)978-91-7459-777-6 (ISBN)
Presentation
2013-11-29, N200, 13:15 (English)
Opponent
Supervisors
Available from: 2014-08-08 Created: 2014-04-07 Last updated: 2016-01-25Bibliographically approved

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Minock, MichaelMollevik, Johan
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Citation style
  • apa
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  • de-DE
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