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Towards a 3D feature overlay through a tetrahedral mesh data structure / Edward Verbree in Cartography and Geographic Information Science, vol 32 n° 4 (October 2005)  

Public [article]  inCartography and Geographic Information Science > vol 32 n° 4 (October 2005) . - pp 303 - 314 Titre : Towards a 3D feature overlay through a tetrahedral mesh data structure Type de document : Article/Communication Auteurs : Edward Verbree, Auteur ; A. Van Der Most, Auteur ; W. Quak, Auteur ; Peter J. M. Van Oosterom, Auteur Année de publication : 2005 Article en page(s) : pp 303 - 314 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] géomètrie algorithmique [Termes IGN] objet géographique 3D [Termes IGN] structure de données localisées [Termes IGN] superposition [Termes IGN] tessellation Résumé : (Auteur) The use of 3D features within GIS bas been increasing due to the need to represent, query, manipulate, and analyse man-made objects in relationship to other 3D features related to the surface of the earth. This will yield an increased use of 3D boundary representations of the features. The spatial relationship between two or more features is often evaluated using a geometrical overlay of these features, which reveals whether these features overlap and-if they do-to which extent. We present the design of a 3D overlay algorithm which overlays 3D triangulated boundary representations through a constrained tetrahedral mesh. The intersections between the constrained facets of the 3D features are calculated on the fly and within a restricted neighbourhood. We can identify and reconstruct the overlaid parts of the 3D boundary representation within the tetrahedral mesh. The implementation is based on the Computational Geometry Algorithms Library, which proved to have the functionality needed but also has its limitations. Numéro de notice : A2005-534 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304005775194791 En ligne : https://doi.org/10.1559/152304005775194791 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27670 [article]

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Generic query tool for spatio-temporal data / Peter J. M. Van Oosterom in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 713 - 748 Titre : Generic query tool for spatio-temporal data Type de document : Article/Communication Auteurs : Peter J. M. Van Oosterom, Auteur ; B. Maessen, Auteur ; W. Quak, Auteur Année de publication : 2002 Article en page(s) : pp 713 - 748 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] cadastre étranger [Termes IGN] données spatiotemporelles [Termes IGN] données thématiques [Termes IGN] INGRES [Termes IGN] MapInfo [Termes IGN] Oracle [Termes IGN] Pays-Bas [Termes IGN] requête spatiale [Termes IGN] système d'information géographique [Termes IGN] système de gestion de base de données Résumé : (Auteur) Geographical information systems are more and more based on a DBMS with spatial extensions, which is also the case for the system described in this paper. The design and implementation of a generic geographical query tool, a platform for querying multiple spatiotemporal data sets and associated thematic data, is presented. The system is designed to be generic, that is without one specific application in mind. It supports adhoc queries covering both the spatial and the thematic part of the data. The generic geographic query tool will be illustrated with spatial and thematic Cadastral data. Special attention will be given to the temporal aspects: a spatiotemporal data model will be described together with a set of views for easy querying. DBMS views play an important role in the architecture of the system: integration of models, aggregation of information, presentation of temporal data, and so on. The current production version of the geographic query tool within the Dutch Cadastre is based on GeoICT products with a relatively small market share (Ingres and GEO + +). A new prototype version is being developed using mainstream GeoICT products (Oracle and MapInfo). First results and open issues with respect to this prototype are presented. Numéro de notice : A2002-257 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810210149399 En ligne : https://doi.org/10.1080/13658810210149399 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22168 [article]

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