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Cartographic generalisation of lines based on a B-spline snake model / E. Guilbert in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 847 - 870 Titre : Cartographic generalisation of lines based on a B-spline snake model Type de document : Article/Communication Auteurs : E. Guilbert, Auteur ; Eric Saux, Auteur Année de publication : 2008 Article en page(s) : pp 847 - 870 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme snake [Termes IGN] fonction spline [Termes IGN] généralisation cartographique automatisée [Termes IGN] lissage de courbe [Termes IGN] navigation maritime [Termes IGN] objet géographique linéaire [Termes IGN] simplification de contour [Termes IGN] système d'information géographique [Termes IGN] visualisation [Vedettes matières IGN] Généralisation Résumé : (Auteur) The automation of cartographic map production is still an important research field in Geographical Information Systems (GIS). With the increasing development of monitoring and decision-aid systems either on computer networks or wireless networks, efficient methods are needed to visualise geographical data while respecting some application constraints (accuracy, legibility, security, etc.). This paper introduces a B-spline snake model to deal with the current operators involved in the cartographic generalisation process of lines. This model enables us to perform those operators with a continuous approach. In order to avoid local conflicts such as intersections or self-intersections, the consistency of the lines is checked and discrete operations such as segment removal are performed during the process. We apply the method to map production in the highly constrained domain of maritime navigation systems. Experimental results of marine chart generalisation yield some discussions about generalisation robustness and quality. Copyright Taylor & Francis Numéro de notice : A2008-305 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701689846 En ligne : https://doi.org/10.1080/13658810701689846 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29298 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-08051	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-08052	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A new model for cloud tracking and analysis on satellite images / E. Guilbert in Geoinformatica, vol 11 n° 3 (September - November 2007)  

Public [article]  inGeoinformatica > vol 11 n° 3 (September - November 2007) . - pp 287 - 309 Titre : A new model for cloud tracking and analysis on satellite images Type de document : Article/Communication Auteurs : E. Guilbert, Auteur Année de publication : 2007 Article en page(s) : pp 287 - 309 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] algorithme snake [Termes IGN] analyse d'image numérique [Termes IGN] détection de contours [Termes IGN] données spatiotemporelles [Termes IGN] modèle mathématique [Termes IGN] modélisation spatio-temporelle [Termes IGN] morphologie mathématique [Termes IGN] nuage [Termes IGN] requête spatiotemporelle Résumé : (Auteur) The study of convective clouds is an important issue in weather analysis. Previous methods are based on shape matching and level set. In this paper, a method based on snake model is used for cloud tracking. Snakes are known to be more efficient than level set for contour detection however they do not handle topological changes. Therefore, geometrical criteria are introduced to characterize topological transformations. Geometrical techniques are then combined and inserted in the tracking algorithm to perform morphological operations. By applying this method, a history of the positions of the clouds is obtained. In a second stage, a data model is presented for cloud interrogation. Physical information is introduced and data are organized so that spatiotemporal queries can be performed. Results obtained with the tracking method on a real data set are presented and some query examples are given. Copyright Springer Numéro de notice : A2007-378 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1007/s10707-006-0008-6 En ligne : https://doi.org/10.1007/s10707-006-0008-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28741 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-07031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

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]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible