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Specifying and implementing constraints in GIS-with examples from a geo-virtual reality system / J. Louwsma in Geoinformatica, vol 10 n° 4 (December 2006)  

Public [article]  inGeoinformatica > vol 10 n° 4 (December 2006) . - pp 531 - 550 Titre : Specifying and implementing constraints in GIS-with examples from a geo-virtual reality system Type de document : Article/Communication Auteurs : J. Louwsma, Auteur ; Sisi Zlatanova, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 531 - 550 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] contrainte d'intégrité [Termes IGN] objet géographique 3D [Termes IGN] OCL [Termes IGN] programmation par contraintes [Termes IGN] réalité virtuelle [Termes IGN] système d'information géographique [Termes IGN] UML Résumé : (Auteur) Constraints are important elements of every modelling process, but until now they have been treated in an ad hoc manner, depending on the specific application domain and the capabilities of the tools used. In GIS and GeoVR applications, constraints are conditions which always have to be valid (true) within the model populated with real geographic object instances. This paper argues that constraints should form a systematic part of the object class definition, similar to other aspects of the definition, viz. attributes, methods and relationships. Also, the implementation of constraints in all GIS and GeoVR subsystems (at front-end, database and exchange (I/O) level) should be derived automatically from the constraints specified by the framework. The paper therefore puts forward a framework for modelling constraints comprising (1) a classification and clarification of constraints, (2) a formal description using the unified modelling language/object constraint language (UML/OCL) and (3) implementation characteristics. The components of the framework are illustrated and applied to SALIX-2, a geo-virtual reality (GeoVR) landscape modelling system. Copyright Springer Numéro de notice : A2006-550 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-0345-5 En ligne : https://doi.org/10.1007/s10707-006-0345-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28273 [article]

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