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Supporting distributed spatial collaboration: an investigation of navigation and radar view techniques / W.A. Schafer in Geoinformatica, vol 10 n° 2 (June - August 2006)  

Public [article]  inGeoinformatica > vol 10 n° 2 (June - August 2006) . - pp 123 - 158 Titre : Supporting distributed spatial collaboration: an investigation of navigation and radar view techniques Type de document : Article/Communication Auteurs : W.A. Schafer, Auteur ; D.A. Bowman, Auteur Année de publication : 2006 Article en page(s) : pp 123 - 158 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] navigation [Termes IGN] positionnement par géodésie spatiale [Termes IGN] technologies spatiales Résumé : (Auteur) Spatial collaboration is a complex problem where people work together within the context of a large, physical place. Our work investigates ways to support distributed, synchronous, spatial collaboration activities. We have conducted an experiment to examine techniques for supporting individual navigation and providing awareness information to the distributed users. Using a collaborative, two-dimensional map interface, we examined continuous and discrete styles of navigation as well as traditional and novel radar view techniques. The results revealed the advantages of continuous navigation, the issues inherent with discrete navigation, and the potential for novel radar view designs. We present the lessons learned from this study as well as some of the issues to consider in designing a spatial collaboration application. Copyright Springer Numéro de notice : A2006-213 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10707-006-7576-3 En ligne : https://doi.org/10.1007/s10707-006-7576-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27940 [article]

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Metadata community profiles for the semantic web / L. Bermudez in Geoinformatica, vol 10 n° 2 (June - August 2006)  

Public [article]  inGeoinformatica > vol 10 n° 2 (June - August 2006) . - pp 159 - 176 Titre : Metadata community profiles for the semantic web Type de document : Article/Communication Auteurs : L. Bermudez, Auteur ; M. Piasecki, Auteur Année de publication : 2006 Article en page(s) : pp 159 - 176 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] hydrologie [Termes IGN] interopérabilité sémantique [Termes IGN] langage de manipulation de données [Termes IGN] métadonnées [Termes IGN] métadonnées géographiques [Termes IGN] norme ISO [Termes IGN] ontologie [Termes IGN] spécification de contenu Résumé : (Auteur) Metadata is needed to facilitate data sharing among geospatial information communities. Geographic Metadata Standards are available but tend to be general and complex in nature and also are not well suited to overcome semantic heterogeneities across vocabularies of different domains and user communities. Current formalizations of metadata standards are not flexible enough to allow reuse and extension of metadata specifications, in particular for Web based information Systems. In order to address this problem, we propose a methodology to create community specific metadata profiles for the Semantic Web by reusing metadata specifications and domain vocabularies encoded as resources for the Web. This ensures that these community profiles are semantically compatible so they can be used in Web based information Systems. The ISO-19115:2003 geographic metadata standard is the most general standard available and is being used in conjunction with the Web Ontology Language as the expression medium to test the methodology for each one of the possible extensions documented in ISO-19115:2003. It is shown that it is possible to extend and reuse metadata specifications and vocabularies distributed in the Web using the Web Ontology Language, by utilizing the language's flexibility to create restrictions on inherit properties and to make interferences on web distributed resources. Examples from the area of Hydrology are provided to demonstrate the technical details of the approach. Copyright Springer Numéro de notice : A2006-214 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-7577-2 En ligne : https://doi.org/10.1007/s10707-006-7577-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27941 [article]

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A quantitative description model for direction relations based on direction groups / Hongxiang Yan in Geoinformatica, vol 10 n° 2 (June - August 2006)  

Public [article]  inGeoinformatica > vol 10 n° 2 (June - August 2006) . - pp 177 - 196 Titre : A quantitative description model for direction relations based on direction groups Type de document : Article/Communication Auteurs : Hongxiang Yan, Auteur ; Y. Chu, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 177 - 196 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] diagramme de Voronoï [Termes IGN] modèle conceptuel de données localisées [Termes IGN] raisonnement spatial [Termes IGN] système d'information géographique [Termes IGN] triangulation de Delaunay Résumé : (Auteur) The description models for spatial relations, especially those for direction relations, have gained increasing attention in GIS and Cartography community in recent decades. In this paper, such a quantitative model for spatial direction relations is discussed. It has been suggested that people often describe directions between two objects using multiple directions but not a single one; therefore a description model for direction relations should use multiple directions, i.e., direction group. A direction group consists of two components: the azimuths of the normals of direction Voronoi edges between two objects and the corresponding weights of the azimuths. The former can be calculated by means of Delaunay triangulation of the vertices and the points of intersection of the two objects; the latter can be calculated using the common areas of the two objects or the lengths of their direction Voronoi diagram (DVD) edges. The advantages of this model exist in four aspects: (1) direction computations are converted into a 1-dimension space problem and use lines (DVDs) to solve it, therefore direction computation process is simplified; (2) once Dir(A,B), the directions from A to B, is obtained, Dir(B,A) can be got without complex computations; (3) a quantitative direction group can be transformed into a qualitative one easily; (4) quantitative direction relations between objects can be recorded in 2-dimension tables, which is very useful in spatial reasoning. Copyright Springer Numéro de notice : A2006-215 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-7578-1 En ligne : https://doi.org/10.1007/s10707-006-7578-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27942 [article]

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Decreasing computational time of urban cellular automata through model portability / C. Dietzel in Geoinformatica, vol 10 n° 2 (June - August 2006)  

Public [article]  inGeoinformatica > vol 10 n° 2 (June - August 2006) . - pp 197 - 211 Titre : Decreasing computational time of urban cellular automata through model portability Type de document : Article/Communication Auteurs : C. Dietzel, Auteur ; K.C. Clarke, Auteur Année de publication : 2006 Article en page(s) : pp 197 - 211 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] automate cellulaire [Termes IGN] échantillonnage [Termes IGN] efficacité [Termes IGN] portabilité [Termes IGN] système d'exploitation [Termes IGN] traitement automatique de données Résumé : (Auteur) This paper investigates how portability of a model between different computer operating Systems can lead to increased efficiency in code execution. The portability problem is not a trivial one, as many geographic models are designed to be run inside a set environment (Unix, Solaris, Linux, and Windows), and are further limited by hardware constraints. The SLEUTH urban growth model [K.C Clarke, S. Hoppen, and L. Gaydos. "A self-modifying cellular automaton model of historical urbanization in the San Francisco Bay area", Environment and Planning B, 24:247-261, 1997] was implemented under three different operating Systems (Solaris, Linux, and Windows). Results suggest that the model's performance is optimized by porting it from its original environment (Unix/Solaris) to Linux or Windows where faster processors are available. While the results show optimization of model performance, there are some suggestions of computational bottlenecks that may eventually limit the increased performance of the model. Regardless, the research demonstrates that the portability of a model can lead to not only to a de-crease in computation time, but may increase the viability in practical applications and attract a wider user base. Copyright Springer Numéro de notice : A2006-216 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-7579-0 En ligne : https://doi.org/10.1007/s10707-006-7579-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27943 [article]

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Handling high-level queries in location-based services for user groups / P. Partsinevelos in Geoinformatica, vol 10 n° 2 (June - August 2006)  

Public [article]  inGeoinformatica > vol 10 n° 2 (June - August 2006) . - pp 213 - 234 Titre : Handling high-level queries in location-based services for user groups Type de document : Article/Communication Auteurs : P. Partsinevelos, Auteur ; Nectaria Tryfona, Auteur Année de publication : 2006 Article en page(s) : pp 213 - 234 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] requête spatiale [Termes IGN] service fondé sur la position [Termes IGN] utilisateur Résumé : (Auteur) In this paper, we deal with the high level management of data involved in Location-Based Services in order to accommodate corresponding queries. A series of techniques are employed on major components of an LBS, namely mobile users, application environment and selected services. First, a grouping technique generalizes the spatio-temporal data describing the mobile users' movement. The environment is represented under a combined spatial and content hierarchy according to the application at hand. Finally, in the service component, relational operators are formed to support relative spatio-temporal queries, while lifeline data types are constructed to extract and compare behavioral trend patterns among the formed user groups. We show how all proposed techniques communicate under a common database schema. Answers to characteristic queries demonstrate the applicability of this work. Copyright Springer Numéro de notice : A2006-217 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-7580-7 En ligne : https://doi.org/10.1007/s10707-006-7580-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27944 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-06021	RAB	Revue	Centre de documentation	En réserve L003	Disponible