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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]

Conflict removal between B-spline curves for isobathymetric line generalization using a snake model / E. Guilbert in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)  

Public [article]  inCartography and Geographic Information Science > vol 33 n° 1 (January 2006) . - pp 37 - 52 Titre : Conflict removal between B-spline curves for isobathymetric line generalization using a snake model Type de document : Article/Communication Auteurs : E. Guilbert, Auteur ; Eric Saux, Auteur ; Marc Daniel, Auteur Année de publication : 2006 Article en page(s) : pp 37 - 52 Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme snake [Termes IGN] B-Spline [Termes IGN] base de données bathymétriques [Termes IGN] bathymétrie [Termes IGN] cohérence des données [Termes IGN] conflit d'espace [Termes IGN] généralisation cartographique automatisée [Termes IGN] isobathe [Termes IGN] polyligne [Vedettes matières IGN] Généralisation Résumé : (Auteur) This paper describes a method for suppressing distance conflicts between isobathymetric lines modeled with B-spline curves for cartographic generalization. The initial B-spline curves are obtained by compressing a set of polygonal lines representing the raw data. The conflict removal is realized by respecting strong cartographic constraints, such as the navigation safety and the legibility of the map, and weak constraints, such as the preservation of the submarine relief. A polygonal line representing the minimal displacement that corrects a conflict is first computed. Then, the curve is deformed using a snake model. The constraints are expressed via different energy terms, and the curve is deformed until a valid solution is reached. In order to apply the method without user intervention, the shape parameters of the snake are set automatically. The advantage of the method is that it ensures the respect of strong constraints in every case while taking into account the weaker ones. The method can also be applied to the correction of visual self-intersections. The use of a snake model combined with B-spline curves permits a better control of the deformation than polygonal lines better preserving of the shape of the curves. Examples of real case studies issued from bathymetric databases are provided, and the benefits and drawbacks of the method are discussed. Copyright CaGISociety Numéro de notice : A2006-204 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304006777323145 En ligne : https://doi.org/10.1559/152304006777323145 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27931 [article]

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