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Interpretive tools for 3D structural geological modelling, part 2: surface design from sparse spatial data / K.B. Sprague in Geoinformatica, vol 9 n° 1 (March - May 2005)  

Public [article]  inGeoinformatica > vol 9 n° 1 (March - May 2005) . - pp 5 - 32 Titre : Interpretive tools for 3D structural geological modelling, part 2: surface design from sparse spatial data Type de document : Article/Communication Auteurs : K.B. Sprague, Auteur ; E.A. DE Kemp, Auteur Année de publication : 2005 Article en page(s) : pp 5 - 32 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] Arctique, océan [Termes IGN] Canada [Termes IGN] courbe de Bézier [Termes IGN] données clairsemées [Termes IGN] extrapolation [Termes IGN] géologie locale [Termes IGN] interprétation automatique [Termes IGN] mine [Termes IGN] modèle géologique [Termes IGN] modélisation 3D [Termes IGN] modélisation géologique volumique (MGV) Résumé : (Auteur) We present software tools and methods applicable to the geological modelling of sparse spatial and structural data within a 3-D digital environment. Free-form surfaces derived from section-style control frames and constrained by field-based structural measurements are employed as partially automated design aids intended to speed up and streamline the 3-D geological model building process. Some design degrees of freedom such as NURBS tension (or weights), knot sequencing and tying surface features are also discussed with examples drawn from spatial and structural data collected in Baffin Island by the Geological Survey of Canada and nearmine exploration data from Canadian mines. Interpolation of field-based structural measurements along the boundary of an unknown surface is also demonstrated. This work is potentially relevant to regional mappers and others dealing with sparse spatial and structural data, and/or conceptual surface modelling. Numéro de notice : A2005-072 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-004-5620-8 En ligne : https://doi.org/10.1007/s10707-004-5620-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27210 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Indexing the trajectories of moving objects in networks / V. Texeira De Almeida in Geoinformatica, vol 9 n° 1 (March - May 2005)  

Public [article]  inGeoinformatica > vol 9 n° 1 (March - May 2005) . - pp 33 - 60 Titre : Indexing the trajectories of moving objects in networks Type de document : Article/Communication Auteurs : V. Texeira De Almeida, Auteur ; Ralf Hartmut Güting, Auteur Année de publication : 2005 Article en page(s) : pp 33 - 60 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] arbre-R [Termes IGN] base de données d'objets mobiles [Termes IGN] base de données spatiotemporelles [Termes IGN] indexation spatiale [Termes IGN] navigation [Termes IGN] objet mobile [Termes IGN] requête spatiale [Termes IGN] réseau ferroviaire [Termes IGN] réseau routier [Termes IGN] trajectoire (véhicule non spatial) Résumé : (Auteur) The management of moving objects has been intensively studied in recent years. A wide and increasing range dose applications has to deal with spatial objects whose position changes continuously over time, called moving objects. The main interest of these applications is to efficiently store and query the positions of these continuously moving objects. To achieve this goal, index structures are required. The main proposals of index structures for moving objects deal with unconstrained 2-dimensional movement. Constrained movement is a special and a very important case of object movement. For example, cars move in roads and trains in railroads. In this paper we propose a new index structure for moving objects on networks, the MON-Tree. We describe two network models that can be indexed by the MON-Tree. The first model is edge oriented, i.e., the network is of nodes and edges and there is a polyline associated to each edge. The second one is more suitable for transportation networks and is route oriented, i.e., the network consists of routes and junctions. In this model, a polyline also serves as a representation of the routes. We propose the index in terms of the basic algorithms for insertion and querying. We test our proposal in an extensive experimental evaluation with generated data sets using as underlying networks the roads of Germany. In our tests, the MON-Tree shows good scalability and outperforms the competing index structures in updating (index creation) as well as in querying. Numéro de notice : A2005-073 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-004-5621-7 En ligne : https://doi.org/10.1007/s10707-004-5621-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27211 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Multi-dimensional scattered ranking methods for geographic information retrieval / Marc Van Kreveld in Geoinformatica, vol 9 n° 1 (March - May 2005)  

Public [article]  inGeoinformatica > vol 9 n° 1 (March - May 2005) . - pp 61 - 84 Titre : Multi-dimensional scattered ranking methods for geographic information retrieval Type de document : Article/Communication Auteurs : Marc Van Kreveld, Auteur ; I. Reinbacher, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 61 - 84 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] accès aux données localisées [Termes IGN] classement [Termes IGN] évaluation des données [Termes IGN] extraction [Termes IGN] indexation spatiale [Termes IGN] recherche d'information géographique [Termes IGN] requête spatiale Résumé : (Auteur) Geographic Information Retrieval is concerned with retrieving documents in response to a spatially related query. This paper addresses the ranking of documents by both textual and spatial relevance. To this end, we introduce multi-dimensional scattered ranking, where textually and spatially similar documents are ranked spread in the list, instead of consecutively. The effect of this is that documents close together in the ranked list have less redundant information. We present various ranking methods of this type, efficient algorithms to implement them, and experiments to show the outcome of the methods. Copyright Springer Numéro de notice : A2005-074 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-004-5622-6 En ligne : https://doi.org/10.1007/s10707-004-5622-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27212 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible