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Efficient MaxCount and threshold operators of moving objects / S. Anderson in Geoinformatica, vol 13 n° 4 (December 2009)
[article]
Titre : Efficient MaxCount and threshold operators of moving objects Type de document : Article/Communication Auteurs : S. Anderson, Auteur ; P. Revesz, Auteur Année de publication : 2009 Article en page(s) : pp 355 - 396 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] agrégat
[Termes IGN] données spatiotemporelles
[Termes IGN] objet mobileRésumé : (Auteur) Calculating operators of continuously moving objects presents some unique challenges, especially when the operators involve aggregation or the concept of congestion, which happens when the number of moving objects in a changing or dynamic query space exceeds some threshold value. This paper presents the following six d-dimensional moving object operators: (1) MaxCount (or MinCount), which finds the Maximum (or Minimum) number of moving objects simultaneously present in the dynamic query space at any time during the query time interval. (2) CountRange, which finds a count of point objects whose trajectories intersect the dynamic query space during the query time interval. (3) ThresholdRange, which finds the set of time intervals during which the dynamic query space is congested. (4) ThresholdSum, which finds the total length of all the time intervals during which the dynamic query space is congested. (5) ThresholdCount, which finds the number of disjoint time intervals during which the dynamic query space is congested. And (6) ThresholdAverage, which finds the average length of time of all the time intervals when the dynamic query space is congested. For these operators separate algorithms are given to find only estimate or only precise values. Experimental results from more than 7,500 queries indicate that the estimation algorithms produce fast, efficient results with error under 5%. Copyright Springer Numéro de notice : A2009-332 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-008-0050-7 En ligne : https://doi.org/10.1007/s10707-008-0050-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29962
in Geoinformatica > vol 13 n° 4 (December 2009) . - pp 355 - 396[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-09041 RAB Revue Centre de documentation En réserve L003 Disponible Update-efficient indexing of moving objects in road networks / J. Chen in Geoinformatica, vol 13 n° 4 (December 2009)
[article]
Titre : Update-efficient indexing of moving objects in road networks Type de document : Article/Communication Auteurs : J. Chen, Auteur ; X. Meng, Auteur Année de publication : 2009 Article en page(s) : pp 397 - 424 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] arbre-R
[Termes IGN] base de données spatiotemporelles
[Termes IGN] index spatial
[Termes IGN] objet mobile
[Termes IGN] réseau routierRésumé : (Auteur) Recent advances in wireless sensor networks and positioning technologies have boosted new applications that manage moving objects. In such applications, a dynamic index is often built to expedite evaluation of spatial queries. However, the development of efficient indexes is a challenge due to frequent object movement. In this paper, we propose a new update-efficient index method for moving objects in road networks. We introduce a dynamic data structure, called adaptive unit, to group neighboring objects with similar movement patterns. To reduce updates, an adaptive unit captures the movement bounds of the objects based on a prediction method, which considers road-network constraints and the stochastic traffic behavior. A spatial index (e.g., R-tree) for the road network is then built over the adaptive unit structures. Simulation experiments, carried on two different datasets, show that an adaptive-unit based index is efficient for both updating and querying performances. Copyright Springer Numéro de notice : A2009-333 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-008-0052-5 En ligne : https://doi.org/10.1007/s10707-008-0052-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29963
in Geoinformatica > vol 13 n° 4 (December 2009) . - pp 397 - 424[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-09041 RAB Revue Centre de documentation En réserve L003 Disponible Web data retrieval: solving spatial range queries using k-nearest neighbor searches / W. Bae in Geoinformatica, vol 13 n° 4 (December 2009)
[article]
Titre : Web data retrieval: solving spatial range queries using k-nearest neighbor searches Type de document : Article/Communication Auteurs : W. Bae, Auteur ; S.H. Kim, Auteur ; S. Alkobaisi, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 483 - 514 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] classification barycentrique
[Termes IGN] géomatique web
[Termes IGN] interface web
[Termes IGN] recherche d'information géographique
[Termes IGN] requête spatiale
[Termes IGN] système d'information géographiqueRésumé : (Auteur) As Geographic Information Systems (GIS) technologies have evolved, more and more GIS applications and geospatial data are available on the web. Spatial objects in a given query range can be retrieved using spatial range query - one of the most widely used query types in GIS and spatial databases. However, it can be challenging to retrieve these data from various web applications where access to the data is only possible through restrictive web interfaces that support certain types of queries. A typical scenario is the existence of numerous business web sites that provide their branch locations through a limited “nearest location” web interface. For example, a chain restaurant’s web site such as McDonalds can be queried to find some of the closest locations of its branches to the user’s home address. However, even though the site has the location data of all restaurants in, for example, the state of California, it is difficult to retrieve the entire data set efficiently due to its restrictive web interface. Considering that k-Nearest Neighbor (k-NN) search is one of the most popular web interfaces in accessing spatial data on the web, this paper investigates the problem of retrieving geospatial data from the web for a given spatial range query using only k-NN searches. Based on the classification of k-NN interfaces on the web, we propose a set of range query algorithms to completely cover the rectangular shape of the query range (completeness) while minimizing the number of k-NN searches as possible (efficiency). We evaluated the efficiency of the proposed algorithms through statistical analysis and empirical experiments using both synthetic and real data sets. Copyright Springer Numéro de notice : A2009-336 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-008-0055-2 En ligne : https://doi.org/10.1007/s10707-008-0055-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29966
in Geoinformatica > vol 13 n° 4 (December 2009) . - pp 483 - 514[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-09041 RAB Revue Centre de documentation En réserve L003 Disponible Bluetooth tracking: a spy in your pocket / B. Van Londersele in GIM international, vol 23 n° 11 (November 2009)
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Titre : Bluetooth tracking: a spy in your pocket Type de document : Article/Communication Auteurs : B. Van Londersele, Auteur ; M. Delafontaine, Auteur ; N. Van De Weghe, Auteur Année de publication : 2009 Article en page(s) : pp 23 - 25 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] analyse spatio-temporelle
[Termes IGN] navigation pédestre
[Termes IGN] objet mobile
[Termes IGN] positionnement par GPS
[Termes IGN] télécommunication sans fil
[Termes IGN] téléphonie mobile
[Termes IGN] traçage
[Termes IGN] trace numériqueRésumé : (Auteur) Researchers at Ghent University in Belgium are using Bluetooth scanners to reconstruct the path of moving persons. Everyone with a Bluetooth-enable phone is participant in their research and will be tracked. Tracking and tracing has been a hot topic in retail for several decades. It now seems that tracking of pedestrians and vehicules is also becoming a booming business. Copyright Reed Business Numéro de notice : A2009-437 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30068
in GIM international > vol 23 n° 11 (November 2009) . - pp 23 - 25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-09111 RAB Revue Centre de documentation En réserve L003 Disponible Positioning localities based on spatial assertions / Y. Liu in International journal of geographical information science IJGIS, vol 23 n°11-12 (november 2009)
[article]
Titre : Positioning localities based on spatial assertions Type de document : Article/Communication Auteurs : Y. Liu, Auteur ; Q. Guo, Auteur ; J. Wieczorek, Auteur ; Michael F. Goodchild, Auteur Année de publication : 2009 Article en page(s) : pp 1471 - 1501 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] géopositionnement
[Termes IGN] incertitude de position
[Termes IGN] modèle conceptuel de données
[Termes IGN] probabilités
[Termes IGN] raisonnement spatial
[Termes IGN] relation spatiale
[Termes IGN] segmentation sémantique
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In practice, descriptive localities are often communicated using named places and spatial relationships. Uncertainty associated with such descriptions of localities is inevitable, and knowledge of such uncertainty is normally not explicit. When translating descriptive localities into spatially explicit ones, it is critical to circumscribe locations and to estimate the associated uncertainty based on a set of appropriate spatial relationships. In conventional research on qualitative spatial reasoning (QSR), spatial relationships are modeled using formal logic. Unfortunately, QSR cannot deal with the uncertainty of a position. In this paper, based on the conceptual model of spatial assertions, we introduce the uncertainty field model to represent the probability distribution of a point locality. Using probability operations, we can combine a set of assertions to position a locality. Conflicts among assertions for a single locality can be detected based on the resulting field. Since spatial relationships play an important role in the uncertainty of target objects, we investigate conceptually the uncertainty fields associated with various types of spatial relationships (for example, topological, directional and metric). In a concrete application, these uncertainty fields can be customized and used without altering the proposed framework. Copyright Taylor & Francis Numéro de notice : A2009-517 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810802247114 En ligne : https://doi.org/10.1080/13658810802247114 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30146
in International journal of geographical information science IJGIS > vol 23 n°11-12 (november 2009) . - pp 1471 - 1501[article]Réservation
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