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Indeterminacy and spatiotemporal data: Basic definitions and case study / Dieter Pfoser in Geoinformatica, vol 9 n° 3 (September - November 2005)  

Public [article]  inGeoinformatica > vol 9 n° 3 (September - November 2005) . - pp 211 - 236 Titre : Indeterminacy and spatiotemporal data: Basic definitions and case study Type de document : Article/Communication Auteurs : Dieter Pfoser, Auteur ; Nectaria Tryfona, Auteur ; C. Jensen, Auteur Année de publication : 2005 Article en page(s) : pp 211 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] données spatiotemporelles [Termes IGN] extension temporelle [Termes IGN] incertitude de position [Termes IGN] incertitude géométrique [Termes IGN] logique floue [Termes IGN] modélisation spatio-temporelle [Termes IGN] objet géographique [Termes IGN] objet mobile Résumé : (Auteur) For some spatiotemporal applications, it can be assumed that the modeled world is precise and bounded, and that also our record of it is precise. While these simplifying assumptions are sufficient in applications like a land information system, they are unnecessarily crude for many other applications that manage data with spatial and/or temporal extents, such as navigational applications. This work explores fuzziness and uncertainty, subsumed under the term indeterminacy, in the spatiotemporal context. To better illustrate the basic spatiotemporal concepts of change or evolution, it is shown how the fundamental modeling concepts of spatial objects, attributes, and relationships and time points and periods are influenced by indeterminacy and how they can be combined. In particular, the focus is on the change of spatial objects and their geometries across time. Four change scenarios are outlined, which concern discrete versus continuous change and asynchronous versus synchronous measurement, and it is shown how to model indeterminacy for each. A case study illustrates the applicability of the paper's general proposal by describing the uncertainty related to the management of the movements of point objects, such as the management of vehicle positions in a fleet management system. Numéro de notice : A2005-325 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-005-1282-4 En ligne : https://doi.org/10.1007/s10707-005-1282-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27461 [article]

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057-05031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Controlled line smoothing by snakes / Dirk Burghardt in Geoinformatica, vol 9 n° 3 (September - November 2005)  

Public [article]  inGeoinformatica > vol 9 n° 3 (September - November 2005) . - pp 237 - 252 Titre : Controlled line smoothing by snakes Type de document : Article/Communication Auteurs : Dirk Burghardt, Auteur Année de publication : 2005 Article en page(s) : pp 237 - 252 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] contrôle automatique [Termes IGN] déplacement d'objet géographique [Termes IGN] généralisation cartographique automatisée [Termes IGN] lissage de courbe [Termes IGN] optimisation (mathématiques) [Termes IGN] typification [Vedettes matières IGN] Généralisation Résumé : (Auteur) A major focus of research in recent years has been the development of algorithms for automated line However, combination of the algorithms with other generalization operators is a challenging problem. In this research a key aim was to extend a snakes optimization approach, allowing displacement of lines, to also be used for line smoothing. Furthermore, automated selection of control parameters is important .for fully automated solutions. An existing approach based on line segmentation was used to control the selection of smoothing parameters dependent on object characteristics. Additionally a new typification routine is presented, which uses the same preprocessed analysis for the segmentation of lines to find suitable candidates from curves bends. The typification is realized by deleting undersized bends and emphasizing the remaining curve bends. The main results of this research are two new algorithms for line generalization, where the importance of the line smoothing algorithm lies in the usage of a optimization approach which can also be used for line displacement. Numéro de notice : A2005-326 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-005-1283-3 En ligne : https://doi.org/10.1007/s10707-005-1283-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27462 [article]

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Digital terrain model computation from contour lines: how to derive quality information from artifact analysis / Olivier Bonin in Geoinformatica, vol 9 n° 3 (September - November 2005)  

Public [article]  inGeoinformatica > vol 9 n° 3 (September - November 2005) . - pp 253 - 268 Titre : Digital terrain model computation from contour lines: how to derive quality information from artifact analysis Type de document : Article/Communication Auteurs : Olivier Bonin , Auteur ; Frédéric Rousseaux, Auteur Année de publication : 2005 Article en page(s) : pp 253 - 268 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] artefact [Termes IGN] contour [Termes IGN] erreur géométrique [Termes IGN] incertitude des données [Termes IGN] modèle numérique de terrain [Termes IGN] qualité des données [Termes IGN] Triangulated Irregular Network Résumé : (Auteur) Digital Terrain Models constructed from contour lines often contain artifacts originating from their construction from irregularly spaced height measurements. We evaluate and illustrate these artifacts and their impact on terrain parameters. We provide algorithms to correct them as much as possible, and propose a methodology to predict areas where uncertainty still remains because of these artifacts. The analysis of these artifacts enables us to derive qualitative parameters such as “likely over-estimated," “likely underestimated," and "with no significant bias” on the DTM. Our method provides a qualitative description of local uncertainty, which is often more relevant for geographical applications than global quality parameters. Numéro de notice : A2005-327 Affiliation des auteurs : COGIT (1988-2011) Thématique : IMAGERIE Nature : Article DOI : 10.1007/s10707-005-1284-2 En ligne : http://dx.doi.org/10.1007/s10707-005-1284-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27463 [article]

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Classification of spatial properties for spatial allocation modeling / T. Shirabe in Geoinformatica, vol 9 n° 3 (September - November 2005)  

Public [article]  inGeoinformatica > vol 9 n° 3 (September - November 2005) . - pp 269 - 287 Titre : Classification of spatial properties for spatial allocation modeling Type de document : Article/Communication Auteurs : T. Shirabe, Auteur Année de publication : 2005 Article en page(s) : pp 269 - 287 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] allocation [Termes IGN] attribut géomètrique [Termes IGN] modélisation spatiale [Termes IGN] primitive géométrique [Termes IGN] programmation informatique [Termes IGN] typologie Résumé : (Auteur) Given a set of spatial units, such as land parcels and grid cells, how to allocate subsets of it to activities of interest while satisfying certain criteria? Such a decision process is here called spatial allocation. Though many problems of spatial allocation share this generic construct, each may have a quite unique set of criteria and interpret even the same criteria in its own way. Such diversity makes it difficult to model spatial allocation problems in unambiguous terms that are amenable to algorithmic solution. This paper proposes a classification scheme for spatial properties that helps to address a variety of spatial properties in establishing spatial allocation criteria. The implication of the paper is that a number of spatial properties and spatial allocation criteria can be decomposed into a few kinds of primitive spatial properties and their relations. Numéro de notice : A2005-328 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-005-1285-1 En ligne : https://doi.org/10.1007/s10707-005-1285-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27464 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05031	RAB	Revue	Centre de documentation	En réserve L003	Disponible