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Titre : NMA’s collaborations on generalisation : the Magnet consortium Type de document : Article/Communication Auteurs : Nicolas Regnauld , Auteur ; Anne Féchir, Auteur ; François Lecordix , Auteur ; Dorthe Rejkjær, Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2007 Conférence : ICC 2007, 23rd International Cartographic Conference ICA 04/08/2007 10/08/2007 Moscou Russie OA Proceedings Importance : 10 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] agent (intelligence artificielle)
[Termes IGN] Clarity (plateforme de généralisation)
[Termes IGN] organisme cartographique national
[Termes IGN] travail coopératif
[Vedettes matières IGN] GénéralisationRésumé : (auteur) Some European National Mapping Agencies (NMAs) decided to create a consortium, called MAGNET, in order to share their experience and tools related to automatic generalisation. They use the same platform, Radius Clarity, developed by 1Spatial (formerly Laser-Scan) from specifications defined by the MAGNET partners. This paper, which is more organizational than technical, reports on the origins, objectives and functions of the MAGNET Consortium. Numéro de notice : C2007-054 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2007/documents/doc/THEME%20 [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102597 Documents numériques
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NMA’s collaborations ... - pdf auteurAdobe Acrobat PDF Outflow preservation of the hydrographic network on the relief in map generalisation / Julien Gaffuri (2007)
Titre : Outflow preservation of the hydrographic network on the relief in map generalisation Type de document : Article/Communication Auteurs : Julien Gaffuri , Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2007 Conférence : ICC 2007, 23rd International Cartographic Conference ICA 04/08/2007 10/08/2007 Moscou Russie OA Proceedings Importance : 12 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] écoulement des eaux
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] réseau hydrographique
[Vedettes matières IGN] GénéralisationRésumé : (auteur) [introduction] In most GIS softwares, geographical data are often stored and managed using a set of independent layers. Many important relationships existing between objects of these layers are not explicit and can therefore be broken by some treatments on the data (such as generalisation) and create inconsistencies. In this paper, we focus on the relationship existing between relief and hydrographic network. This relationship is particularly important: in the real world, the hydrographic network flows down on the relief. Many rivers are located inside deep thalwegs, which have been hollowed out by the rivers themselves. The geographic data representing the relief and the hydrographic network should therefore respect this outflow relationship. This relationship is sometimes not respected in geographic datasets. A cause of this inconstancy is that the elevation and hydrographic data are often collected separately (with different acquisition processes and levels of detail) without taking into account this relationship. An other cause is the use of some treatments on either the relief or the hydrographic network or even both, which can alter the outflow relationship. For example, in map generalisation, hydrographic sections are often displaced in order to avoid an overlapping with other objects, such as a road parallel to a river. As a consequence, the outflow relationship between hydrographic sections and the relief can be broken. Our goal is to give a method to correct these inconsistencies Numéro de notice : C2007-052 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2007/documents/doc/THEME%20 [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102595 Documents numériques
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Outflow preservation ... - pdf auteurAdobe Acrobat PDF
Titre : River network selection based on structure and pattern recognition Type de document : Article/Communication Auteurs : Guillaume Touya , Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2007 Conférence : ICC 2007, 23rd International Cartographic Conference ICA 04/08/2007 10/08/2007 Moscou Russie OA Proceedings Importance : 17 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] continuité cartographique
[Termes IGN] modèle (conceptuel) de généralisation
[Termes IGN] reconnaissance de formes
[Termes IGN] réseau hydrographique
[Vedettes matières IGN] GénéralisationRésumé : (auteur) [introduction] Generalisation aims at reducing the level of detail of a database in order to meet new specifications. A lot of work have dealt with automated generalisation for many years. Most of them concerned cartographic generalisation that aims at producing maps but this paper focuses on purely database (or model) generalisation. This paper addresses a specific and important problem of database generalisation, the generalisation of river network data. The paper emphasizes on the problem of selection: which stream is important enough to be part of the generalized dataset? River network selection has already been treated in the past by [12,9]. The solution presented here particularly employs the principle of "good continuation" to enrich the database with "river strokes". The second part of the paper presents a state of the art of river network generalisation. The third part explains the problems, the hypotheses and the pre-processes necessary for selection. The fourth part describes the generalisation process proposed to solve the problem. The fifth part presents the results obtained with this process on actual French datasets. Finally, this paper is concluded with leads for further research. Numéro de notice : C2007-015 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication DOI : 10.13140/RG.2.1.1594.4167 En ligne : http://dx.doi.org/10.13140/RG.2.1.1594.4167 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89964 Documents numériques
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River network selection ... - post-printAdobe Acrobat PDF Effect of generalization on area features: a comparative study of two strategies / T. Cheng in Cartographic journal (the), vol 43 n° 2 (July 2006)
[article]
Titre : Effect of generalization on area features: a comparative study of two strategies Type de document : Article/Communication Auteurs : T. Cheng, Auteur ; Z. Li, Auteur Année de publication : 2006 Article en page(s) : pp 157 - 170 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] agrégation de détails
[Termes IGN] analyse comparative
[Termes IGN] carte thématique
[Termes IGN] fusion de données
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] mesure de la qualité
[Termes IGN] objet géographique zonal
[Termes IGN] qualité des données
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) The generalization of area features is a very important topic in digital map generalization, particularly in thematic map generalization. The operations used in area generalization, will cause changes in the geometry and thematic attributes of area features and the topological relationships between them. Very limited quantitative measures, especially for semantics, are available to describe the effect of generalization when multiple objects are involved or when the entire map needs to be characterized. Therefore, the aim of this study is to provide some quantitative measures for the changes (especially in semantics) that have occurred during generalization. A set of quantitative measures of data quality, i.e. accuracy, consistency, and completeness, has been developed to assess such effects. The effect of generalization on area features are compared between two approaches, geometry-based merging and theme-based aggregation. An experimental test has also been carried out to illustrate their differences in terms of the proposed quality measures, which demonstrates the practical usefulness of these measures. Numéro de notice : A2006-610 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870406X114649 En ligne : https://doi.org/10.1179/000870406X114649 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28333
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Code-barres Cote Support Localisation Section Disponibilité 030-06021 RAB Revue Centre de documentation En réserve L003 Disponible Deformation using agents for map generalization : application to the preservation of relationships between fields and objects / Julien Gaffuri (01/06/2006)
contenu dans AutoCarto 2006, Vancouver, Washington, Volume 1. Papers / Cartography and geographic information society (2006)
Titre : Deformation using agents for map generalization : application to the preservation of relationships between fields and objects Type de document : Article/Communication Auteurs : Julien Gaffuri , Auteur Editeur : [s.l.] : [s.n.] Année de publication : 01/06/2006 Conférence : Auto-Carto 2006, international symposium on cartography and computing 26/06/2006 28/06/2006 Vancouver Colombie britannique - Canada OA Proceedings Importance : 12 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation cartographique automatisée
[Termes IGN] modèle orienté agent
[Termes IGN] objet géographique
[Termes IGN] programmation par contraintes
[Termes IGN] relief
[Termes IGN] triangulation de Delaunay
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Some research in map generalization techniques using the agent paradigm have allowed to progress significantly toward automation. These models allow the computation of discrete transformations of the objects but are not adapted for continuous transformations such as deformations. Our challenge is to allow these models to manage such continuous transformations. As an application, we aim to introduce field data such as the relief in agent-based generalization models. Many relationships exist between fields and objects (especially buildings, roads and rivers). Our concern is to preserve these relationships. We propose to allow the geographic agents to deform a field during the generalization process. To attain this objective, we propose a model: 1- To measure and interpret relationships between fields and objects (this allows to define new constraints), 2- To compute fields deformations under objects stretching, 3- To manage the automatic trigger of these measurements and deformations in the existing agent based generalization models. We propose to model the field as a triangulation, and to explicit some shape preservation constraints on the points, segments, angles and triangles composing the field. When a point is stretched, its displacement propagates to its neighbors using a multi-agent convergence method we have built. Numéro de notice : A2006-664 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://cartogis.org/docs/proceedings/2006/julien.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64341 Documents numériques
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14346_auto-carto_2006__gaffuri.pdfAdobe Acrobat PDF Toward quantitative measures for the semantic quality of polygon generalization / T. Cheng in Cartographica, vol 41 n° 2 (June 2006)PermalinkOutils et méthodes de généralisation du bâti pour la fabrication des cartes au 1:25.000 et au 1:50.000 / Jenny Trévisan in Bulletin d'information scientifique et technique de l'IGN, n° 75 (mars 2006)PermalinkAutomatisation de l'orientation des pointeurs kilométriques & indicateurs de qualité de la généralisation pour la Top 100 / Sylvain Lafay (2006)PermalinkPermalinkConflict 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)PermalinkDétection et généralisation des échangeurs routiers dans une base de données cartographiques vectorielles / Nicolas Culson (2006)PermalinkGeneralisation or data matching for integration? Insights from experiments on databases at different levels of details / Guillaume Touya (2006)PermalinkHow to merge optimization and agent-based techniques in a single generalization model? / Julien Gaffuri (2006)PermalinkA method for generalisation of river networks based on "strokes" and database enrichment [extended abstract] / Guillaume Touya (2006)PermalinkPermalink