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Auteur Nectaria Tryfona |
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Handling high-level queries in location-based services for user groups / P. Partsinevelos in Geoinformatica, vol 10 n° 2 (June - August 2006)
[article]
Titre : Handling high-level queries in location-based services for user groups Type de document : Article/Communication Auteurs : P. Partsinevelos, Auteur ; Nectaria Tryfona, Auteur Année de publication : 2006 Article en page(s) : pp 213 - 234 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] requête spatiale
[Termes IGN] service fondé sur la position
[Termes IGN] utilisateurRésumé : (Auteur) In this paper, we deal with the high level management of data involved in Location-Based Services in order to accommodate corresponding queries. A series of techniques are employed on major components of an LBS, namely mobile users, application environment and selected services. First, a grouping technique generalizes the spatio-temporal data describing the mobile users' movement. The environment is represented under a combined spatial and content hierarchy according to the application at hand. Finally, in the service component, relational operators are formed to support relative spatio-temporal queries, while lifeline data types are constructed to extract and compare behavioral trend patterns among the formed user groups. We show how all proposed techniques communicate under a common database schema. Answers to characteristic queries demonstrate the applicability of this work. Copyright Springer Numéro de notice : A2006-217 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-7580-7 En ligne : https://doi.org/10.1007/s10707-006-7580-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27944
in Geoinformatica > vol 10 n° 2 (June - August 2006) . - pp 213 - 234[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-06021 RAB Revue Centre de documentation En réserve L003 Disponible Indeterminacy and spatiotemporal data: Basic definitions and case study / Dieter Pfoser in Geoinformatica, vol 9 n° 3 (September - November 2005)
[article]
Titre : Indeterminacy and spatiotemporal data: Basic definitions and case study Type de document : Article/Communication Auteurs : Dieter Pfoser, Auteur ; Nectaria Tryfona, Auteur ; C. Jensen, Auteur Année de publication : 2005 Article en page(s) : pp 211 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] données spatiotemporelles
[Termes IGN] extension temporelle
[Termes IGN] incertitude de position
[Termes IGN] incertitude géométrique
[Termes IGN] logique floue
[Termes IGN] modélisation spatio-temporelle
[Termes IGN] objet géographique
[Termes IGN] objet mobileRésumé : (Auteur) For some spatiotemporal applications, it can be assumed that the modeled world is precise and bounded, and that also our record of it is precise. While these simplifying assumptions are sufficient in applications like a land information system, they are unnecessarily crude for many other applications that manage data with spatial and/or temporal extents, such as navigational applications. This work explores fuzziness and uncertainty, subsumed under the term indeterminacy, in the spatiotemporal context. To better illustrate the basic spatiotemporal concepts of change or evolution, it is shown how the fundamental modeling concepts of spatial objects, attributes, and relationships and time points and periods are influenced by indeterminacy and how they can be combined. In particular, the focus is on the change of spatial objects and their geometries across time. Four change scenarios are outlined, which concern discrete versus continuous change and asynchronous versus synchronous measurement, and it is shown how to model indeterminacy for each. A case study illustrates the applicability of the paper's general proposal by describing the uncertainty related to the management of the movements of point objects, such as the management of vehicle positions in a fleet management system. Numéro de notice : A2005-325 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-005-1282-4 En ligne : https://doi.org/10.1007/s10707-005-1282-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27461
in Geoinformatica > vol 9 n° 3 (September - November 2005) . - pp 211 - 236[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-05031 RAB Revue Centre de documentation En réserve L003 Disponible