Descripteur
Documents disponibles dans cette catégorie (762)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
A data model and query language for spatio-temporal decision support / L. Gomez in Geoinformatica, vol 15 n° 3 (July 2011)
[article]
Titre : A data model and query language for spatio-temporal decision support Type de document : Article/Communication Auteurs : L. Gomez, Auteur ; Bart Kuijpers, Auteur ; A. Vaisman, Auteur Année de publication : 2011 Article en page(s) : pp 455 - 496 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] aide à la décision
[Termes IGN] analyse spatio-temporelle
[Termes IGN] base de données spatiotemporelles
[Termes IGN] langage de requête
[Termes IGN] modèle conceptuel de données localisées
[Termes IGN] objet mobile
[Termes IGN] OLAP
[Termes IGN] requête spatiotemporelle
[Termes IGN] SOLAP
[Termes IGN] SQL
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In recent years, applications aimed at exploring and analyzing spatial data have emerged, powered by the increasing need of software that integrates Geographic Information Systems (GIS) and On-Line Analytical Processing (OLAP). These applications have been called SOLAP (Spatial OLAP). In previous work, the authors have introduced Piet, a system based on a formal data model that integrates in a single framework GIS, OLAP (On-Line Analytical Processing), and Moving Object data. Real-world problems are inherently spatio-temporal. Thus, in this paper we present a data model that extends Piet, allowing tracking the history of spatial data in the GIS layers. We present a formal study of the two typical ways of introducing time into Piet: timestamping the thematic layers in the GIS, and timestamping the spatial objects in each layer. We denote these strategies snapshot-based and timestamp-based representations, respectively, following well-known terminology borrowed from temporal databases. We present and discuss the formal model for both alternatives. Based on the timestamp-based representation, we introduce a formal First-Order spatio-temporal query language, which we denote Lt, able to express spatio-temporal queries over GIS, OLAP, and trajectory data. Finally, we discuss implementation issues, the update operators that must be supported by the model, and sketch a temporal extension to Piet-QL, the SQL-like query language that supports Piet. Numéro de notice : A2011-209 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-010-0110-7 Date de publication en ligne : 17/06/2010 En ligne : https://doi.org/10.1007/s10707-010-0110-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30987
in Geoinformatica > vol 15 n° 3 (July 2011) . - pp 455 - 496[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-2011031 RAB Revue Centre de documentation En réserve L003 Disponible Giving the ‘right’ route directions : the requirements for pedestrian navigation systems / C. Schroder in Transactions in GIS, vol 15 n° 3 (July 2011)
[article]
Titre : Giving the ‘right’ route directions : the requirements for pedestrian navigation systems Type de document : Article/Communication Auteurs : C. Schroder, Auteur ; B. Gittings, Auteur ; William A Mackaness, Auteur Année de publication : 2011 Article en page(s) : pp 419 - 438 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] classification
[Termes IGN] détection automatique
[Termes IGN] itinéraire
[Termes IGN] milieu urbain
[Termes IGN] navigation pédestre
[Termes IGN] point d'intérêt
[Termes IGN] point de repèreRésumé : (Auteur) It is more natural and effective to include a variety of landmarks when providing route directions. Many of the existing solutions, however, behave like car navigation systems and do not include references to such landmarks. This research provides empirical evidence to identify the information requirements for an automated pedestrian navigation system. The two experiments discussed within this article helped identify the criteria that govern the relative saliency of features of interest within an urban environment. There are a large variety of features of interest that can be used as directional aids within route descriptions (buildings, statues, monuments, hills, roads, etc). Different measures are therefore required in order to calculate the saliency of the different classes of features. The research revealed that the most important measures of saliency include name, size, age, and colour. The research confirmed that that relative visibility and the direction of approach to the feature also affect a landmark's saliency. The research also highlighted the role that features of interest play in reorientation, confirmatory, and direction-giving tasks. Numéro de notice : A2011-227 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01266.x Date de publication en ligne : 06/06/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01266.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31005
in Transactions in GIS > vol 15 n° 3 (July 2011) . - pp 419 - 438[article]Mining boundary effects in areally referenced spatial data using the Bayesian information criterion / Sudipto Banerjee in Geoinformatica, vol 15 n° 3 (July 2011)
[article]
Titre : Mining boundary effects in areally referenced spatial data using the Bayesian information criterion Type de document : Article/Communication Auteurs : Sudipto Banerjee, Auteur ; A. Mcbean, Auteur Année de publication : 2011 Article en page(s) : pp 435 - 454 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] auto-régression
[Termes IGN] données localisées numériques
[Termes IGN] estimation bayesienne
[Termes IGN] image aérienne
[Termes IGN] limite indéterminée
[Termes IGN] Minnesota (Etats-Unis)
[Termes IGN] modèle statistique
[Termes IGN] santéRésumé : (Auteur) Statistical models for areal data are primarily used for smoothing maps revealing spatial trends. Subsequent interest often resides in the formal identification of ‘boundaries’ on the map. Here boundaries refer to ‘difference boundaries’, representing significant differences between adjacent regions. Recently, Lu and Carlin (Geogr Anal 37:265–285, 2005) discussed a Bayesian framework to carry out edge detection employing a spatial hierarchical model that is estimated using Markov chain Monte Carlo (MCMC) methods. Here we offer an alternative that avoids MCMC and is easier to implement. Our approach resembles a model comparison problem where the models correspond to different underlying edge configurations across which we wish to smooth (or not). We incorporate these edge configurations in spatially autoregressive models and demonstrate how the Bayesian Information Criteria (BIC) can be used to detect difference boundaries in the map. We illustrate our methods with a Minnesota Pneumonia and Influenza Hospitalization dataset to elicit boundaries detected from the different models. Numéro de notice : A2011-208 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-010-0109-0 Date de publication en ligne : 18/06/2010 En ligne : https://doi.org/10.1007/s10707-010-0109-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30986
in Geoinformatica > vol 15 n° 3 (July 2011) . - pp 435 - 454[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-2011031 RAB Revue Centre de documentation En réserve L003 Disponible PostGIS pour les néophytes (5ème partie) / Anonyme in Géomatique expert, n° 81 (01/07/2011)
[article]
Titre : PostGIS pour les néophytes (5ème partie) Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2011 Article en page(s) : 8 p. ; pp 32 - 39 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] base de données localisées
[Termes IGN] informatique
[Termes IGN] langage de programmation
[Termes IGN] PostGIS
[Termes IGN] SQL
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Nous abordons, dans ce nouveau volet d'introduction à la cartouche spatiale PostGIS, des requêtes un peu plus élaborées, mettant en jeu les nombreux opérateurs vus dans les numéros précédents. Numéro de notice : A2011-318 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31097
in Géomatique expert > n° 81 (01/07/2011) . - 8 p. ; pp 32 - 39[article]Voir aussiRéservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 265-2011041 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001041 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Query-aware location anonymization for road networks / C. Chow in Geoinformatica, vol 15 n° 3 (July 2011)
[article]
Titre : Query-aware location anonymization for road networks Type de document : Article/Communication Auteurs : C. Chow, Auteur ; M. Mokbel, Auteur ; Jie Bao, Auteur ; X. Liu, Auteur Année de publication : 2011 Article en page(s) : pp 571 - 607 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] espace euclidien
[Termes IGN] requête spatiale
[Termes IGN] réseau routier
[Termes IGN] service fondé sur la positionRésumé : (Auteur) Recently, several techniques have been proposed to protect the user location privacy for location-based services in the Euclidean space. Applying these techniques directly to the road network environment would lead to privacy leakage and inefficient query processing. In this paper, we propose a new location anonymization algorithm that is designed specifically for the road network environment. Our algorithm relies on the commonly used concept of spatial cloaking, where a user location is cloaked into a set of connected road segments of a minimum total length L including at least K users. Our algorithm is “query-aware” as it takes into account the query execution cost at a database server and the query quality, i.e., the number of objects returned to users by the database server, during the location anonymization process. In particular, we develop a new cost function that balances between the query execution cost and the query quality. Then, we introduce two versions of our algorithm, namely, pure greedy and randomized greedy, that aim to minimize the developed cost function and satisfy the user specified privacy requirements. To accommodate intervals with a high workload, we introduce a shared execution paradigm that boosts the scalability of our location anonymization algorithm and the database server to support large numbers of queries received in a short time period. Extensive experimental results show that our algorithms are more efficient and scalable than the state-of-the-art technique, in terms of both query execution cost and query quality. The results also show that our algorithms have very strong resilience to two privacy attacks, namely, the replay attack and the center-of-cloaked-area attack. Numéro de notice : A2011-212 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-010-0117-0 Date de publication en ligne : 06/11/2010 En ligne : https://doi.org/10.1007/s10707-010-0117-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30990
in Geoinformatica > vol 15 n° 3 (July 2011) . - pp 571 - 607[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-2011031 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkThe elements of probabilistic time geography / Stephan Winter in Geoinformatica, vol 15 n° 3 (July 2011)PermalinkThe partial sequenced route query with traveling rules in road networks / H. Chen in Geoinformatica, vol 15 n° 3 (July 2011)Permalinkvol 25 n° 6-7 - june - july 2011 - Object-based landscape analysis (Bulletin de International journal of geographical information science IJGIS) / Paul AplinPermalinkApproche géosémantique intégrée pour les cubes évolutifs de données géospatiales / Mohamed Bakillah in Revue internationale de géomatique, vol 21 n° 1 (mars – mai 2011)PermalinkCartographie des eaux souterraines en milieu fissuré par analyse multicritère : Cas de Bondoukou (Côte-d'Ivoire) / M. Youan Ta in Revue internationale de géomatique, vol 21 n° 1 (mars – mai 2011)PermalinkInformation géographique, analyse spatiale et géogouvernance / Michelle Masson-Vincent in Espace géographique, vol 40 n° 2 (avril - juin 2011)PermalinkInterpreting motion events of pairs of moving objects / B. Gottfried in Geoinformatica, vol 15 n° 2 (April 2011)PermalinkQualitative change detection using sensor networks based on connectivity information / J. Jiang in Geoinformatica, vol 15 n° 2 (April 2011)Permalinkvol 25 n° 3 - march 2011 - Spatial ecology (Bulletin de International journal of geographical information science IJGIS) / Andrew K. SkidmorePermalink