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The role of contextual info-marks in navigating a virtual rural environment / Adam Rousell in Transactions in GIS, vol 20 n° 1 (February 2016)  

Public [article]  inTransactions in GIS > vol 20 n° 1 (February 2016) . - pp 1 – 19 Titre : The role of contextual info-marks in navigating a virtual rural environment Type de document : Article/Communication Auteurs : Adam Rousell, Auteur ; Claire Jarvis, Auteur ; Chris Brunsdon, Auteur Année de publication : 2016 Article en page(s) : pp 1 – 19 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] calcul d'itinéraire [Termes IGN] géovisualisation [Termes IGN] milieu rural [Termes IGN] monde virtuel [Termes IGN] navigation automobile [Termes IGN] petit écran [Termes IGN] point de repère [Termes IGN] prise en compte du contexte Résumé : (auteur) Navigation is a task performed in both large and small scale environments. Landmarks within an environment are of great benefit to these navigational tasks, but in large rural environments such landmarks may be sparse. It has been shown that landmarks need not be purely visual and that a change in context for a feature can make it become a landmark against its surroundings (such as being provided with significant meaning). Such meaning could be added through personal experience or by informing the observer via some form of communication. To investigate the effects of providing such contextual information on navigational performance, experiments were conducted in a large rural virtual environment where the delivery method of the information was varied between onscreen and PDA display. Users were instructed to perform a route tracing navigation task. In some instances users were presented with textual information about specific locations within the environment which appeared when they were in the vicinity of the location. Both quantitative and qualitative data were collected and analyzed, with results indicating that although the actual performance in the task was not significantly improved, users felt that their performance was better and the task easier when they were presented with the contextual information. Numéro de notice : A2016-445 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12136 En ligne : http://dx.doi.org/10.1111/tgis.12136 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81353 [article]

Feature-driven generalization of isobaths on nautical charts: A multi-agent system approach / Eric Guilbert in Transactions in GIS, vol 20 n° 1 (February 2016)  

Public [article]  inTransactions in GIS > vol 20 n° 1 (February 2016) . - pp 126 – 143 Titre : Feature-driven generalization of isobaths on nautical charts: A multi-agent system approach Type de document : Article/Communication Auteurs : Eric Guilbert, Auteur Année de publication : 2016 Article en page(s) : pp 126 – 143 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] base de données bathymétriques [Termes IGN] carte bathymétrique [Termes IGN] carte marine [Termes IGN] généralisation automatique de données [Termes IGN] isobathe [Termes IGN] navigation maritime [Termes IGN] prise en compte du contexte [Termes IGN] programmation par contraintes [Termes IGN] relief sous-marin [Termes IGN] système multi-agents [Vedettes matières IGN] Généralisation Résumé : (auteur) A nautical chart provides a schematic view of the seafloor where isobaths (contour lines joining points of same depth) and depth soundings are generalized to highlight undersea features that form navigational hazards and routes. Considering that the process is ultimately driven by features and their significance to navigation, this article proposes a generalization strategy where isobath generalization is controlled by undersea features directly. The seafloor is not perceived as a continuous depth field but as a set of discrete features composed by groups of isobaths. In this article, generalization constraints and operators are defined at feature level and composed of constraints and operators applying to isobaths. In order to automate the process, a multi-agent system is designed where features are autonomous agents evaluating their environment in order to trigger operations. Interactions between agents are described and an example on a bathymetric database excerpt illustrates the feasibility of the approach. Numéro de notice : A2016-446 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12147 En ligne : http://dx.doi.org/10.1111/tgis.12147 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81354 [article]

Qualitative GIS: An Open Framework Using SpatiaLite and Open Source GIS / Ryan Garnett in Transactions in GIS, vol 20 n° 1 (February 2016)  

Public [article]  inTransactions in GIS > vol 20 n° 1 (February 2016) . - pp 144 – 159 Titre : Qualitative GIS: An Open Framework Using SpatiaLite and Open Source GIS Type de document : Article/Communication Auteurs : Ryan Garnett, Auteur ; Pavlov Kanaroglou, Auteur Année de publication : 2016 Article en page(s) : pp 144 – 159 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] environnement de développement [Termes IGN] logiciel libre [Termes IGN] prise en compte du contexte [Termes IGN] SIG qualitatif [Termes IGN] SpatiaLite [Termes IGN] SQL [Termes IGN] système de gestion de base de données Résumé : (auteur) Qualitative GIS is a relatively new methodological approach for analyzing and visualizing qualitative data within a geographic context. Qualitative data can take many forms, including interviews, documents, photographs, and audio and video clips. Content analysis for example, is an effective qualitative method for analyzing text-based data. We argue that basic concepts, (i.e. how to store data, data requirements, visualization techniques, and modes of analysis) within qualitative GIS have not been adequately defined, rendering difficult the replication of work performed and hindering the development of incremental knowledge in the field. Database management systems provide a means for storing, managing, and analyzing qualitative GIS data. A standardized and well-designed open source database system provides a mechanism for qualitative GIS projects, ensuring consistency and project replication. Qualitative GIS data stored in a database allows for additional visualization options, such as geographic word clouds. To demonstrate the concepts we performed content analysis on Master Transportation Plans from Calgary and Montreal using SpatiaLite, an open source database system. We developed Structured Query Language (SQL) queries to generate and populate groups and theme tables within the SpatiaLite database. We present our database design and queries in the hopes that they will help others conducting qualitative GIS research. Numéro de notice : A2016-447 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12163 En ligne : http://dx.doi.org/10.1111/tgis.12163 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81356 [article]