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Enabling routes of road network constrained movements as mobile service context / A. Brilingaite in Geoinformatica, vol 11 n° 1 (March - May 2007)  

Public [article]  inGeoinformatica > vol 11 n° 1 (March - May 2007) . - pp 55 - 102 Titre : Enabling routes of road network constrained movements as mobile service context Type de document : Article/Communication Auteurs : A. Brilingaite, Auteur ; C.S. Jensen, Auteur Année de publication : 2007 Article en page(s) : pp 55 - 102 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Informatique [Termes IGN] bibliothèque logicielle [Termes IGN] itinéraire [Termes IGN] positionnement par GPS [Termes IGN] prise en compte du contexte [Termes IGN] service fondé sur la position [Termes IGN] stockage de données [Termes IGN] téléphonie mobile Résumé : (Auteur) With the continuing advances in wireless communications, geo-positioning, and portable electronics, an infrastructure is emerging that enables the delivery of on-line, location-enabled services to very large numbers of mobile users. A typical usage situation for mobile services is one characterized by a small screen and no keyboard, and by the service being only a secondary focus of the user. Under such circumstances, it is particularly important to deliver the “right” information and service at the right time, with as little user interaction as possible. This may be achieved by making services context aware. Mobile users frequently follow the same route to a destination as they did during previous trips to the destination, and the route and destination constitute important aspects of the context for a range of services. This paper presents key concepts underlying a software component that identifies and accumulates the routes of a user along with their usage patterns and that makes the routes available to services. The problems associated with of route recording are analyzed, and algorithms that solve the problems are presented. Experiences from using the component on logs of GPS positions acquired from vehicles traveling within a real road network are reported. Copyright Springer Numéro de notice : A2007-166 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10707-006-0010-z En ligne : https://doi.org/10.1007/s10707-006-0010-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28529 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Trajectory indexing using movement constraints / C.S. Jensen in Geoinformatica, vol 9 n° 2 (June - August 2005)  

Public [article]  inGeoinformatica > vol 9 n° 2 (June - August 2005) . - pp 93 - 115 Titre : Trajectory indexing using movement constraints Type de document : Article/Communication Auteurs : C.S. Jensen, Auteur Année de publication : 2005 Article en page(s) : pp 93 - 115 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] base de données d'objets mobiles [Termes IGN] base de données spatiotemporelles [Termes IGN] dimension fractale [Termes IGN] données spatiotemporelles [Termes IGN] indexation spatiale [Termes IGN] objet mobile [Termes IGN] reconstruction d'itinéraire ou de trajectoire [Termes IGN] réduction géométrique [Termes IGN] réseau de transport [Termes IGN] réseau routier [Termes IGN] système de gestion de base de données Résumé : (Auteur) With the proliferation of mobile computing, the ability to index efficiently the movements of mobile objects becomes important. Objects are typically seen as moving in two-dimensional (x, y) space, which means that their movements across time may be embedded in the three-dimensional (x, y, t) space. Further, the movements are typically represented as trajectories, sequences of connected line segments. In certain cases, movement is restricted; specifically, in this paper, we aim at exploiting that movements occur in transportation networks to reduce the dimensionality of the data. Briefly, the idea is to reduce movements to occur in one spatial dimension. As a consequence, the movement occurs in two-dimensional (x, t) space. The advantages of considering such lower-dimensional trajectories are that the overall size of the data is reduced and that lower-dimensional data is to be indexed. Since off-the-shelf database management systems typically do not offer higher-dimensional indexing, this reduction in dimensionality allows us to use existing DBMSes to store and index trajectories. Moreover, we argue that, given the right circumstances, indexing these dimensionality-reduced trajectories can be more efficient than using a three-dimensional index. A decisive factor here is the fractal dimension of the network-the lower, the more efficient is the proposed approach. This hypothesis is verified by an experimental study that incorporates trajectories stemming from real and synthetic road networks. Numéro de notice : A2005-222 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-005-6429-9 En ligne : https://doi.org/10.1007/s10707-005-6429-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27359 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-05021	RAB	Revue	Centre de documentation	En réserve L003	Disponible