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Topologically consistent 3D city models obtained by extrusion / Hugo Ledoux in International journal of geographical information science IJGIS, vol 25 n° 4-5 (May 2011)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 25 n° 4-5 (May 2011) . - pp 557 - 574 Titre : Topologically consistent 3D city models obtained by extrusion Type de document : Article/Communication Auteurs : Hugo Ledoux, Auteur ; Martijn Meijers, Auteur Année de publication : 2011 Article en page(s) : pp 557 - 574 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] CityGML [Termes IGN] intégrité topologique [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] programmation par contraintes [Termes IGN] Triangulated Irregular Network [Termes IGN] triangulation de Delaunay Résumé : Auteur) One of the simplest methods to construct a 3D city model is to extrude building footprints to obtain “block-shaped" polyhedra representing buildings. While the method is well-known and easy to implement, if the 2D topological relationships between the footprints are not taken into account, the resulting 3D city models will not necessarily be topologically consistent (i.e. primitives shared by 3D buildings will be duplicated and/or intersect each others). As a result, the model will be of little use for most applications, besides visualisation that is. In this paper, we present a new extrusion procedure to construct topologically correct 3D city models. It is based on the use of a constrained triangulation, is conceptually simple, and offers great flexibility to create city models in different formats (e.g. CityGML or a surface-based representation). We have implemented the procedure, tested it with real-world datasets, and validated it. Numéro de notice : A2011-566 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658811003623277 En ligne : http://dx.doi.org/10.1080/13658811003623277 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79398 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2011032	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-2011031	SL	Revue	Centre de documentation	Revues en salle	Disponible

A semantic-rich multi-scale information model for topography / Jantien E. Stoter in International journal of geographical information science IJGIS, vol 25 n° 4-5 (May 2011)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 25 n° 4-5 (May 2011) . - pp 739 - 763 Titre : A semantic-rich multi-scale information model for topography Type de document : Article/Communication Auteurs : Jantien E. Stoter, Auteur ; T. Visser, Auteur ; Peter J. M. Van Oosterom, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 739 - 763 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] cadastre étranger [Termes IGN] formalisation [Termes IGN] généralisation automatique de données [Termes IGN] information sémantique [Termes IGN] modèle conceptuel de données localisées [Termes IGN] OCL [Termes IGN] Pays-Bas [Termes IGN] représentation multiple [Termes IGN] UML Résumé : (Auteur) National mapping agencies maintain topographic data sets at different scales. Keeping the data sets consistent, for example by means of automated update propagation, requires formal knowledge on how the different data sets relate to each other. This article presents a multi-scale information model that, first, integrates the data states at the different scales and, second, formalises semantics on scale transitions. This is expressed using the Unified Modelling Language (UML) class diagrams, complemented with Object Constraint Language (OCL). Based on a requirement analysis using the needs of the Netherlands' Kadaster as case study, this article examines several modelling alternatives and selects the optimal modelling approach for a multi-scale information model for topography. The model is evaluated through a prototype database implementation. The results show that UML/OCL provides an appropriate formalism to model rich semantics on both multi-scale data content and scale transitions, which can be used for guarding consistency based on automated generalisation of updates. Further research is required to express generalisation specifications that are currently not formalised and that are only available in software code or as cartographers' knowledge. Numéro de notice : A2011-569 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658816.2010.490218 En ligne : http://dx.doi.org/10.1080/13658816.2010.490218 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79402 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2011032	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-2011031	SL	Revue	Centre de documentation	Revues en salle	Disponible