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ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications 08/07/2002 12/07/2002 Ottawa Canada OA ISPRS Archives
nom du congrès :
ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications
début du congrès :
08/07/2002
fin du congrès :
12/07/2002
ville du congrès :
Ottawa
pays du congrès :
Canada
site des actes du congrès :
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contenu dans Geospatial theory, processing and applications : proceedings of the ISPRS commission 4 symposium, 8 -12 July 2002, Ottawa, Canada / Costas Armenakis (2002)
Titre : Generalization of 3D building data Type de document : Article/Communication Auteurs : Franck Thiemann, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 01/08/2002 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 34-4 Conférence : ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications 08/07/2002 12/07/2002 Ottawa Canada OA ISPRS Archives Importance : pp 286 - 290 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation automatique de données
[Termes IGN] reconstruction 3D
[Termes IGN] visualisation de données
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Today, more and more (semi-) automatic tools and techniques are getting available, that allow for an efficient capture of more and more detailed 3D city models. With the availability of such data, the question rises, how these typically huge data sets can efficiently be handled, manipulated, analysed and visualized. Concerning visualization, the Level of Detail (LOD) concept from Computer Graphic provides a mechanism to only present that information, that is currently visible in an adequate resolution level. The problem, however, is how such a multi-scale representation of buildings can be automatically gained. This generation is a generalization problem. In the paper a concept is sketched, that relies on the representation of buildings in terms of Constructive Solid Geometry (CSG). Firstly, the complex building shape has to be transformed into CSG, which involves a segmentation of the building into its relevant parts. Secondly, generalization mechanisms can operate on the CSG-tree. Finally, the transition between neighbouring generalization levels is achieved using a differential scheme, where only the differences between adjacent generalization levels are stored, instead of the whole models. Numéro de notice : C2002-021 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication DOI : sans En ligne : http://www.isprs.org/proceedings/XXXIV/part4/pdfpapers/455.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64979 Documents numériques
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Generalization of 3D building data - pdf éditeurAdobe Acrobat PDFFormalising the geographic database generalisation process by means of a conflicts/operations graph / Dominique Han-Sze-Chuen (2002)
contenu dans Geospatial theory, processing and applications : proceedings of the ISPRS commission 4 symposium, 8 -12 July 2002, Ottawa, Canada / Costas Armenakis (2002)
Titre : Formalising the geographic database generalisation process by means of a conflicts/operations graph Type de document : Article/Communication Auteurs : Dominique Han-Sze-Chuen, Auteur ; Sébastien Mustière Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2002 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 34-4 Conférence : ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications 08/07/2002 12/07/2002 Ottawa Canada OA ISPRS Archives Importance : pp 269 - 273 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation automatique de données
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] graphe
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Database generalisation is a process which aims at producing a geographic database from an initial geographic database in order to satisfy new needs. Starting from the study of an actual database generalisation process developed at the Ministere des Ressources Naturelles of Quebec (MRNQ), our intention was to formalise the cartographic knowledge contained in the process to make it reusable. MRNQ's process has the form of a workflow which contains a list of actions applied to object classes. Since we wanted to extract generic knowledge, we introduced the notions of problem and operation: our assumption is that the cartographic knowledge formalised using these two notions is generic enough to be applied to other cases of generalisation. Thus, we propose a causal graph which associates a set of problems to a set of operations. The utility of such a model is that it offers an explanation for each actions contained in the workflow and allows an anticipation of future problems when creating a new workflow. Numéro de notice : C2002-020 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://www.isprs.org/proceedings/XXXIV/part4/pdfpapers/374.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64978 Documents numériques
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Formalising the geographic database generalisation process - pdf éditeurAdobe Acrobat PDFGeospatial theory, processing and applications : proceedings of the ISPRS commission 4 symposium, 8 -12 July 2002, Ottawa, Canada / Costas Armenakis (2002)
Titre : Geospatial theory, processing and applications : proceedings of the ISPRS commission 4 symposium, 8 -12 July 2002, Ottawa, Canada Type de document : Actes de congrès Auteurs : Costas Armenakis, Éditeur scientifique ; Y.C. Lee, Éditeur scientifique Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2002 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 34-4 Conférence : ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications 08/07/2002 12/07/2002 Ottawa Canada OA ISPRS Archives Importance : 808 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie
[Termes IGN] analyse spatiale
[Termes IGN] base de données localisées
[Termes IGN] cartographie numérique
[Termes IGN] exploration de données
[Termes IGN] généralisation automatique de données
[Termes IGN] Infrastructure de données
[Termes IGN] intégration de données
[Termes IGN] visualisation de donnéesNuméro de notice : 10549 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes DOI : sans En ligne : https://www.isprs.org/proceedings/XXXIV/part4/ Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34532 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 10549-01 CG2002 Livre Centre de documentation Congrès Disponible
contenu dans Geospatial theory, processing and applications : proceedings of the ISPRS commission 4 symposium, 8 -12 July 2002, Ottawa, Canada / Costas Armenakis (2002)
Titre : What is spatial context in cartographic generalisation? Type de document : Article/Communication Auteurs : Sébastien Mustière Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2002 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 34-4 Conférence : ISPRS 2002, Commission 4 symposium, Geospatial theory, processing and applications 08/07/2002 12/07/2002 Ottawa Canada OA ISPRS Archives Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] base de connaissances
[Termes IGN] généralisation automatique de données
[Termes IGN] généralisation de base de données
[Termes IGN] modèle (conceptuel) de généralisation
[Termes IGN] prise en compte du contexte
[Termes IGN] règle
[Termes IGN] relation spatiale
[Vedettes matières IGN] GénéralisationRésumé : (auteur) During the cartographic generalisation process, geographic objects cannot just be considered one by one. The way objects are processed clearly depends on their spatial context. In this paper, we first study the nature of spatial context encountered dur ing map generalisation. We differentiate three kinds of relations that an object can have with its environment: being part of a significant group, being in a particular area, being in relation with 'same-level' surrounding objects. We also address the issue of scale- dependency related to spatial context. Then, we study how to represent context-related knowledge in a knowledge-based approach of cartographic generalisation. We discuss several aspects of the representation of objects' spatial context in a geographic data model dedicated to map generalisation: explicit representations of high-level objects, fuzzy representation of objects and relations, multi- scale representation of objects and relations, spatialisation of relations. We also study how context appears in the rules expr essed by cartographers to describe the generalisation process: it can be used to express exceptions, to classify typical operations to b e done, or to express constraints on the final result. Numéro de notice : C2002-028 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE Nature : Communication DOI : sans En ligne : http://www.isprs.org/proceedings/XXXIV/part4/pdfpapers/377.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86563 Documents numériques
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What is spatial context - pdf éditeurAdobe Acrobat PDF
