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How many 3D city models are there? A typological try / M. Jahnke in Cartographic journal (the), vol 48 n° 2 (May 2011)  

Public [article]  inCartographic journal (the) > vol 48 n° 2 (May 2011) . - pp 124 - 130 Titre : How many 3D city models are there? A typological try Type de document : Article/Communication Auteurs : M. Jahnke, Auteur ; Jukka Mathias Krisp, Auteur ; H. Kumke, Auteur Année de publication : 2011 Conférence : ICC 2011, 25th International Cartographic Conference and 15th ICA General Assembly 03/07/2011 08/07/2011 Paris France OA Proceedings Article en page(s) : pp 124 - 130 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] capacité de stockage [Termes IGN] densité d'information [Termes IGN] information sémantique [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] niveau d'abstraction [Termes IGN] qualité des données [Termes IGN] segmentation d'image [Termes IGN] texturage [Termes IGN] topologie [Termes IGN] visualisation 3D Résumé : (Auteur) Three-dimensional (3D) city models are intended to represent the geometry along with the appearance of the reality. In some cases, photos are precisely mapped as texture onto the geometric model, which then renders a realistic impression of the underlying environment. In other cases, the models are visualized in a more abstract way. This paper is dedicated to investigating the relation of level of abstraction, information density and storage capacity for the representation of a 3D city model. Increasing the level of abstraction usually leads to the decrease of information density to be processed. Accordingly, the general storage capacity will decrease as well. Since a higher level of abstraction is less bound to photorealistic aspects, it may allow further semantic information to be accommodated in the visualisation process. If the level of abstraction in a city model increases in a well-controlled way so that the characteristic features are enhanced while non-relevant information is inhibited, the user’s cognitive load during task completion may be reduced. This implies an increased efficiency of information communication. Using image segmentation algorithms, the elements within a facade per unit of area are successively reduced while preserving the characteristic structures within the image. The segmented image holds the sufficient information to be recognized in the environment. We treat the three concepts, level of abstraction, information density and storage capacity, as fundamental variables for the visualisation of building facades. To deal with these concepts, we organizing them on a continuum, which enables us to find a tradeoff between a potential loss of information and the level of usage for various tasks. Numéro de notice : A2011-263 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277411Y.0000000010 Date de publication en ligne : 22/11/2013 En ligne : https://doi.org/10.1179/1743277411Y.0000000010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31041 [article]

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