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A framework for models of movement in geographic space / Jia Wang in International journal of geographical information science IJGIS, vol 30 n° 5-6 (May - June 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 5-6 (May - June 2016) . - pp 970 - 992 Titre : A framework for models of movement in geographic space Type de document : Article/Communication Auteurs : Jia Wang, Auteur ; Matt Duckham, Auteur ; Michael F. Worboys, Auteur Année de publication : 2016 Article en page(s) : pp 970 - 992 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatio-temporelle [Termes IGN] granularité (informatique) [Termes IGN] modèle numérique [Termes IGN] objet mobile [Termes IGN] temps instantané Résumé : (Auteur) This article concerns the theoretical foundations of movement informatics. We discuss general frameworks in which models of spatial movement may be developed. In particular, the article considers the object–field and Lagrangian–Eulerian dichotomies, and the SNAP/SPAN ontologies of the dynamic world, and classifies the variety of informatic structures according to these frameworks. A major challenge is transitioning between paradigms. Usually data is captured with respect to one paradigm but can usefully be represented in another. We discuss this process in formal terms and then describe experiments that we performed to show feasibility. It emerges that observational granularity plays a crucial role in these transitions. Numéro de notice : A2016-291 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1078466 En ligne : https://doi.org/10.1080/13658816.2015.1078466 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80870 [article]

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Generation of navigation graphs for indoor space / L. Yang in International journal of geographical information science IJGIS, vol 29 n° 10 (October 2015)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 29 n° 10 (October 2015) . - pp 1737 - 1756 Titre : Generation of navigation graphs for indoor space Type de document : Article/Communication Auteurs : L. Yang, Auteur ; Michael F. Worboys, Auteur Année de publication : 2015 Article en page(s) : pp 1737 - 1756 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] graphe [Termes IGN] graphe topologique [Termes IGN] modèle géométrique du bâti [Termes IGN] positionnement en intérieur Résumé : (auteur) This article proposes a comprehensive approach to computing a navigation graph for an indoor space. It focuses on a single floor, but the work is easily extensible to multi-level spaces. The approach proceeds by using a formal model, based on the combinatorial map but enhanced with geometric and semantic information. The process is almost fully automatic, taking as input the building plans providing the geometric structure of the floors and semantics of the building, such as functions of interior spaces, portals, etc. One of the novel aspects in this work was the use of combinatorial maps and their duals to provide a compact formal description of the topology and connectivity of the indoor structure represented by a connected, embedded graph. While making use of existing libraries for the more routine computational geometry involved, the research develops several new algorithms, including one for computing the local kernel of a region. The process is evaluated by means of a case study using part of a university building. Numéro de notice : A2015-610 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1041141 En ligne : https://doi.org/10.1080/13658816.2015.1041141 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78039 [article]

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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Identifying factors of geographic event conceptualisation / Alexander Klippel in International journal of geographical information science IJGIS, vol 22 n° 1-2 (february 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 1-2 (february 2008) . - pp 183 - 204 Titre : Identifying factors of geographic event conceptualisation Type de document : Article/Communication Auteurs : Alexander Klippel, Auteur ; Michael F. Worboys, Auteur ; Matt Duckham, Auteur Année de publication : 2008 Article en page(s) : pp 183 - 204 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatio-temporelle [Termes IGN] graphe [Termes IGN] modélisation spatio-temporelle [Termes IGN] ontologie [Termes IGN] relation topologique [Termes IGN] variable régionalisée [Termes IGN] voisinage (relation topologique) Résumé : (Auteur) The present paper examines whether the formal topological characterisation of spatial relations between moving geographic regions provides an adequate basis for the human conceptualisation of motion events for those regions. The paper focuses on gradual changes in topological relationships caused by continuous transformations of the regions (specifically, translations). Using a series of experiments, the conceptualisation and perception of conceptual neighborhoods is investigated. In particular, the role of conceptual neighborhoods in characterising motion events is scrutinised. The experiments employ a grouping paradigm and a custom-made tool for presenting animated icons. The analysis examines whether paths through a conceptual neighborhood graph sufficiently characterise the conceptualisation of the movement of two regions. The results of the experiments show that changes in topological relations—as detailed by paths through a conceptual neighborhood graph—are not sufficient to characterise the cognitive conceptualisation of moving regions. The similarity ratings show clear effects of perceptually and conceptually induced groupings such as identity (which region is moving), reference (whether a larger or a smaller region is moving), and dynamics (whether both regions are moving at the same time). Copyright Taylor & Francis Numéro de notice : A2008-107 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701405607 En ligne : https://doi.org/10.1080/13658810701405607 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29102 [article]

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Monitoring qualitative spatiotemporal change for geosensor networks / Michael F. Worboys in International journal of geographical information science IJGIS, vol 20 n° 10 (november 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 10 (november 2006) . - pp 1087 - 1108 Titre : Monitoring qualitative spatiotemporal change for geosensor networks Type de document : Article/Communication Auteurs : Michael F. Worboys, Auteur ; Matt Duckham, Auteur Année de publication : 2006 Article en page(s) : pp 1087 - 1108 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] données spatiotemporelles [Termes IGN] graphe [Termes IGN] modèle conceptuel de données localisées [Termes IGN] objet géographique [Termes IGN] raisonnement spatial [Termes IGN] topologie Résumé : (Auteur) Recent technological advances in geosensor networks demand new models of distributed computation with dynamic spatial information. This paper presents a computational model of spatial change in dynamic regions (such as may be derived from discretizations of continuous fields) founded on embeddings of graphs in orientable surfaces. Continuous change, connectedness and regularity of dynamic regions are defined and local transition rules are used to constrain region evolution and enable more efficient inference of a region's state. The model provides a framework for the detection of global high-level events based on local low-level ‘snapshot’ spatiotemporal data. The approach has particular relevance to environmental monitoring with geosensor networks, where technological constraints make the detection of global behaviour from local conditions highly advantageous. Copyright Taylor & Francis Numéro de notice : A2006-451 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600852180 En ligne : https://doi.org/10.1080/13658810600852180 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28175 [article]

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An algebraic approach to automated geospatial information fusion / Matt Duckham in International journal of geographical information science IJGIS, vol 19 n° 5 (may 2005)  

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Event-oriented approaches to geographic phenomena / Michael F. Worboys in International journal of geographical information science IJGIS, vol 19 n° 1 (january 2005)  

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Spatial information theory, foundations of geographic information science / Werner Kuhn (2003)  

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Generalizing graphs using amalgamation and selection / J.G. Stell (20/07/1999)  

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Metrics and topologies for geographic space / Michael F. Worboys (12/08/1996)

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GIS / Michael F. Worboys (1995)

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Selected papers from the first national conference on GIS research UK / Michael F. Worboys (1994)  

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