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Interpreting motion events of pairs of moving objects / B. Gottfried in Geoinformatica, vol 15 n° 2 (April 2011)  

Public [article]  inGeoinformatica > vol 15 n° 2 (April 2011) . - pp 247 - 271 Titre : Interpreting motion events of pairs of moving objects Type de document : Article/Communication Auteurs : B. Gottfried, Auteur Année de publication : 2011 Article en page(s) : pp 247 - 271 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatiale [Termes IGN] données localisées [Termes IGN] langage de modélisation [Termes IGN] objet géographique ponctuel [Termes IGN] objet mobile [Termes IGN] raisonnement spatial Résumé : (Auteur) When accumulating large quantities of positional data with ubiquitous positioning techniques, methods are required that can efficiently make use of these data. This work proposes a representation that approximates motion events of pairs of objects. It is shown how the employment of formal grammars enables the interpretation of such motion events. This is accomplished by composing motion patterns into specific qualitative features. In particular, the change of relative directions defines characteristic motion events. Numéro de notice : A2011-086 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-009-0095-2 Date de publication en ligne : 08/10/2009 En ligne : https://doi.org/10.1007/s10707-009-0095-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30866 [article]

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057-2011021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Qualitative change detection using sensor networks based on connectivity information / J. Jiang in Geoinformatica, vol 15 n° 2 (April 2011)  

Public [article]  inGeoinformatica > vol 15 n° 2 (April 2011) . - pp 305 - 328 Titre : Qualitative change detection using sensor networks based on connectivity information Type de document : Article/Communication Auteurs : J. Jiang, Auteur ; Michael F. Worboys, Auteur ; Silvia Nittel, Auteur Année de publication : 2011 Article en page(s) : pp 305 - 328 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] aérosol [Termes IGN] analyse diachronique [Termes IGN] connexité (informatique) [Termes IGN] détection de changement [Termes IGN] données spatiotemporelles [Termes IGN] gaz [Termes IGN] réseau de capteurs [Termes IGN] Sensor Web Enablement [Termes IGN] traitement de données Résumé : (Auteur) The research reported in this paper uses wireless sensor networks to provide salient information about spatially distributed dynamic fields, such as regional variations in temperature or concentration of a toxic gas. The focus is on deriving qualitative descriptions of salient changes to areas of high-activity that occur during the temporal evolution of the field. The changes reported include region merging or splitting, and hole formation or elimination. Such changes are formally characterized, and a distributed qualitative change reporting (QCR) approach is developed that detects the qualitative changes simply based on the connectivity between the sensor nodes without location information. The efficiency of the QCR approach is investigated using simulation experiments. The results show that the communication cost of the QCR approach in monitoring large-scale phenomena is an order of magnitude lower than that using the standard boundary-based data collection approach, where each node is assumed to have its location information. Numéro de notice : A2011-087 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.1007/s10707-009-0097-0 Date de publication en ligne : 22/10/2009 En ligne : https://doi.org/10.1007/s10707-009-0097-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30867 [article]

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Connectivity in the regular polytope representation / R. Thompson in Geoinformatica, vol 15 n° 2 (April 2011)  

Public [article]  inGeoinformatica > vol 15 n° 2 (April 2011) . - pp 223 - 246 Titre : Connectivity in the regular polytope representation Type de document : Article/Communication Auteurs : R. Thompson, Auteur ; Peter J. M. Van Oosterom, Auteur Année de publication : 2011 Article en page(s) : pp 223 - 246 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] algèbre de Boole [Termes IGN] base de données localisées [Termes IGN] connexité (graphes) [Termes IGN] objet géographique [Termes IGN] raisonnement spatial [Termes IGN] relation topologique [Termes IGN] traitement géométrique de données Résumé : (Auteur) In order to be able to draw inferences about real world phenomena from a representation expressed in a digital computer, it is essential that the representation should have a rigorously correct algebraic structure. It is also desirable that the underlying algebra be familiar, and provide a close modelling of those phenomena. The fundamental problem addressed in this paper is that, since computers do not support real-number arithmetic, the algebraic behaviour of the representation may not be correct, and cannot directly model a mathematical abstraction of space based on real numbers. This paper describes a basis for the robust geometrical construction of spatial objects in computer applications using a complex called the “Regular Polytope”. In contrast to most other spatial data types, this definition supports a rigorous logic within a finite digital arithmetic. The definition of connectivity proves to be non-trivial, and alternatives are investigated. It is shown that these alternatives satisfy the relations of a region connection calculus (RCC) as used for qualitative spatial reasoning, and thus introduce the rigor of that reasoning to geographical information systems. They also form what can reasonably be termed a “Finite Boolean Connection Algebra”. The rigorous and closed nature of the algebra ensures that these primitive functions and predicates can be combined to any desired level of complexity, and thus provide a useful toolkit for data retrieval and analysis. The paper argues for a model with two and three-dimensional objects that have been coded in Java and which implement a full set of topological and connectivity functions which is shown to be complete and rigorous. Numéro de notice : A2011-088 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-009-0094-3 Date de publication en ligne : 20/10/2009 En ligne : https://doi.org/10.1007/s10707-009-0094-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30868 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-2011021	RAB	Revue	Centre de documentation	En réserve L003	Disponible