Descripteur
Documents disponibles dans cette catégorie (6)



Etendre la recherche sur niveau(x) vers le bas
Efficient maintenance of continuous queries for trajectories / H. Ding in Geoinformatica, vol 12 n° 3 (September - November 2008)
![]()
[article]
Titre : Efficient maintenance of continuous queries for trajectories Type de document : Article/Communication Auteurs : H. Ding, Auteur ; Goce Trajcevski, Auteur ; Peter Scheuermann, Auteur Année de publication : 2008 Article en page(s) : pp 255 - 288 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'objets mobiles
[Termes IGN] base de données localisées
[Termes IGN] index spatial
[Termes IGN] objet mobile
[Termes IGN] Oracle 9I
[Termes IGN] prise en compte du contexte
[Termes IGN] prototype
[Termes IGN] requête spatialeRésumé : (Auteur) We address the problem of optimizing the maintenance of continuous queries in Moving Objects Databases, when a set of pending continuous queries need to be reevaluated as a result of bulk updates to the trajectories of moving objects. Such bulk updates may happen when traffic abnormalities, e.g., accidents or road works, affect a subset of trajectories in the corresponding regions, throughout the duration of these abnormalities. The updates to the trajectories may in turn affect the correctness of the answer sets for the pending continuous queries in much larger geographic areas. We present a comprehensive set of techniques, both static and dynamic, for improving the performance of reevaluating the continuous queries in response to the bulk updates. The static techniques correspond to specifying the values for the various semantic dimensions of trigger execution. The dynamic techniques include an in-memory shared reevaluation algorithm, extending query indexing to queries described by trajectories and query reevaluation ordering based on space-filling curves. We have completely implemented our system prototype on top of an existing Object-Relational Database Management System, Oracle 9i, and conducted extensive experimental evaluations using realistic data sets to demonstrate the validity of our approach. Copyright Springer Numéro de notice : A2008-281 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-007-0029-9 En ligne : https://doi.org/10.1007/s10707-007-0029-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29274
in Geoinformatica > vol 12 n° 3 (September - November 2008) . - pp 255 - 288[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 057-08031 RAB Revue Centre de documentation En réserve 3L Disponible Multicriteria spatial decision analysis in web GIS environment / Harish Chandra Karnatak in Geoinformatica, vol 11 n° 4 (December 2007)
![]()
[article]
Titre : Multicriteria spatial decision analysis in web GIS environment Type de document : Article/Communication Auteurs : Harish Chandra Karnatak, Auteur ; S. Saran, Auteur ; K. Bhatia, Auteur ; P.S. Roy, Auteur Année de publication : 2007 Article en page(s) : pp 405 - 429 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse multicritère
[Termes IGN] analyse spatiale
[Termes IGN] approche hiérarchique
[Termes IGN] ArcIms
[Termes IGN] ArcSDE
[Termes IGN] base de données documentaires
[Termes IGN] biodiversité
[Termes IGN] diffusion de données
[Termes IGN] diffusion par internet
[Termes IGN] Oracle 9I
[Termes IGN] outil d'aide à la décision
[Termes IGN] serveur de données localisées
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Internet, a client/server system, is a perfect means of GIS data accessing, analyzing and transmission. The World Wide Web, FTP (file transfer protocol) and HTTP programs make it convenient to access and transfer data files across the Internet. Using Internet for GIS makes it easy access to acquire GIS data from diverse data sources in the distributed environment. The geospatial multicriteria decision analysis in a client/server environment is an important and challenging task for the GIS community because of narrow Internet bandwidth for large geospatial data sets. In the present paper, we are developing a multicriteria decision analysis tool for spatial decision making in the web GIS environment. The developed system has been demonstrated for biodiversity conservation and priorities. An attempt has been made to generate the alternative decisions based on priority vectors. The multicriteria technique of Analytic Hierarchy Process (AHP) is used to derive the eigen vectors with the given multiple constraints of conflicting criteria and aims at selecting optimal alternative from the available sets. However, the evaluation recognizes the importance of expert knowledge when assigning the weights for the best spatial priorities. Comparing within classes and alternatives using judgment and decision matrix is based on Saaty's Pairwise Comparison. The Multicriteria Spatial Decision Support System (MC-SDSS) software development uses ASP, ArcIMS 9.0, ArcSDE9.0, and Oracle 9i data server in the web GIS environment. The database organization of spatial and non-spatial data is done in the RDBMS environment using ArcSDE and Oracle 9i data server. Copyright Springer Numéro de notice : A2007-468 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-0014-8 En ligne : https://doi.org/10.1007/s10707-006-0014-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28831
in Geoinformatica > vol 11 n° 4 (December 2007) . - pp 405 - 429[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 057-07041 RAB Revue Centre de documentation En réserve 3L Disponible Shall 3-D city models be managed in a commercial database? / G. Groger in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)
[article]
Titre : Shall 3-D city models be managed in a commercial database? Type de document : Article/Communication Auteurs : G. Groger, Auteur ; M. Reuter, Auteur ; L. Plumer, Auteur Année de publication : 2004 Article en page(s) : pp 9 - 15 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] arbre-R
[Termes IGN] base de données relationnelles
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] Oracle 9I
[Termes IGN] performance
[Termes IGN] requête spatiale
[Termes IGN] système de gestion de base de données
[Termes IGN] système de gestion de bases de données relationnellesRésumé : (Auteur) An increasing number of municipalities and companies start to build up three-dimensional city models. These are the precondition for many relevant GIS applications, for example visualization, city and land use planning as well as telecommunications planning and disaster management. These municipalities and companies are faced with the strategic decision how to manage the collected data in a sustainable and interoperable way. The paper answers the questions whether commercial databases shall be used to manage 3-D city models, and to which degree modeling, efficient analysis and interoperable exchange of data is supported by these databases. The focus is on the widespread commercial database system oracle 9i Spatial. Numéro de notice : A2004-402 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26929
in GIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 9 - 15[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 058-04091 RAB Revue Centre de documentation En réserve 3L Disponible La DRIRE de Haute-Normandie se met au goût du SIG / Anonyme in Géomatique expert, n° 22 (01/01/2003)
[article]
Titre : La DRIRE de Haute-Normandie se met au goût du SIG Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2003 Article en page(s) : pp 10 - 13 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] canalisation
[Termes IGN] cartographie des risques
[Termes IGN] Haute-Normandie
[Termes IGN] MapInfo
[Termes IGN] Oracle 9I
[Termes IGN] patrimoine immobilier
[Termes IGN] prévention des risques
[Termes IGN] risque technologique
[Termes IGN] système d'information géographique
[Termes IGN] zone industrielleRésumé : (Documentaliste) La Direction Régionale à l'Industrie, la Recherche et l'Environnement de Haute-Normandie a mis en place un SIG afin de mieux répertorier et contrôler les risques industriels dans les zones sensibles. Un premier constat : les données sur les risques sont reportées dans des documents sur papier variés difficiles à mettre à jour alors que le patrimoine industriel important nécessite un suivi régulier ; il faut pouvoir décider et communiquer rapidement. Le SIGNE a permis de géoréférencer les les sites dangereux et les batiments potentiellement menaçants. Un site internet grand public sera ouvert courant 2003 pour afficher les cartes de risques. L'application s'appuie sur MapInfo et Oracle 9i et utilise des données sur les installations classées, les sols pollués et les canalisations, l'eau et le PLU. Numéro de notice : A2003-124 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22420
in Géomatique expert > n° 22 (01/01/2003) . - pp 10 - 13[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 265-03011 RAB Revue Centre de documentation En réserve 3L Disponible
Titre : Towards a coherent integration of 2D linear data into a DTM Type de document : Article/Communication Auteurs : Frédéric Rousseaux, Auteur ; Olivier Bonin , Auteur
Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2003 Conférence : ICC 2003, 21st International Cartographic Conference of ICA 10/08/2003 16/08/2003 Durban Afrique du sud Importance : pp 1936 - 1942 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données vectorielles
[Termes IGN] inondation
[Termes IGN] intégration de données
[Termes IGN] Java (langage de programmation)
[Termes IGN] modèle numérique de terrain
[Termes IGN] objet géographique linéaire
[Termes IGN] objet géographique zonal
[Termes IGN] Oracle 9I
[Termes IGN] Oxygène (plateforme de généralisation)
[Termes IGN] réseau routier
[Termes IGN] risque naturel
[Termes IGN] simulationRésumé : (Auteur) This paper deals with the integration of vector data into a digital terrain model (DTM) to perform flood risk analysis. The integration of geographic 2D vector objects into a DTM usually raises data coherence issues. To address these issues, 2D objects are transformed into 2,5D objects and then integrated into an enriched DTM in a coherent way. We focus our research on objects describing civil engineering works such as roads, dikes, or embankments. Such a coherent integration of 2D objects into a DTM can change flood behaviour simulations deeply and thus predicted damage areas. The first part of this paper describes the general methodology used for road integration. Simple placing of 2D linear roads on a DIM generally gives unrealistic results. Our approach consists in transforming 2D linear data into 2.5D surfaces describing terrain in a more realistic way. We transform 2D linear roads into 2.5D surfacic roads by assigning them a width, and computing their elevation. The altitude of each point of the road is computed with the help of the DTM and the altimetric attribute of nodes, under slope and regularity constraints. Then, we compute a new DTM, resulting from the original DTM constrained by the 2.5D roads. We observe that this integration alters the DTM locally. The second part reports on the analysis of a DTM after the integration of roads. We base our analysis on two main applications: visualisation and hydrology. As roads were initially captured at a much higher scale than the DTM, the creation of a microrelief is observed. This microrelief may contain artefacts, which could create uncertain areas. The study of these areas helps us to define the range of scale and the validation of such methods. By comparing the results obtained by hydrological simulation with our refined DTM and with the initial DTM, we highlight the precision and coherence gained when using this enriched DTM. With our algorithms. the new DTM is more accurate on certain keyareas such as dikes or roads, which are civil engineering works that are very important for flood simulations. The third part focuses on the implementation of these algorithms in an experimental Java GIS platform, linked to an Oracle 9i database. Then this part report on the analysis of our TIN enrichment. The original TIN is locally modified. Some inconsistencies between the original TIN and the vector data are fixed thanks to the integration of new 2.5D information. For example, in the enriched TIN, rivers follow the talwegs. Without 2.5D vector information, talwegs are interpolated from contour lines and are not consistent with the river network. As a conclusion, we suggest that our work can be extended to fit other applications, such as trajectory computation. Numéro de notice : C2003-021 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65000 Documents numériques
peut être téléchargé
Towards a coherent integration ... - pdfAdobe Acrobat PDF Permalink