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A schedule-based pathfinding algorithm for transit networks using Pattern First Search [PFS] / R. Huang in Geoinformatica, vol 11 n° 2 (June - August 2007)
[article]
Titre : A schedule-based pathfinding algorithm for transit networks using Pattern First Search [PFS] Type de document : Article/Communication Auteurs : R. Huang, Auteur Année de publication : 2007 Article en page(s) : pp 269 - 285 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] chemin le plus rapide, algorithme du
[Termes IGN] complexité
[Termes IGN] données spatiotemporelles
[Termes IGN] requête spatiale
[Termes IGN] réseau de transport
[Termes IGN] système d'information géographiqueRésumé : (Auteur) The lack of effective and efficient schedule-based pathfinding algorithms for transit networks has limited the application of GIS in transit trip planning services. This paper introduces a schedule-based path finding algorithm for transit networks. Based on a pattern-centered spatiotemporal transit network model, the algorithm searches the network by following route patterns. A pattern is a spatial layout of a route in transit terminology. A route usually has many patterns to serve various locations at different times. This path search algorithm is significantly different from traditional shortest path algorithms that are based on adjacent node search. By establishing a set of lemmas and theorems the paper proves that paths generated by the PFS algorithm are schedule-coordinated fastest paths for trips with given constraints. After analyzing computation and database query complexities of the algorithm the paper indicates that the PFS is efficient in computation and database query. Finally, effectiveness and efficiency of the algorithm are demonstrated by implementations in GIS-based online transit trip planners in Wisconsin, US. Copyright Springer Numéro de notice : A2007-240 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-0011-y En ligne : https://doi.org/10.1007/s10707-006-0011-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28603
in Geoinformatica > vol 11 n° 2 (June - August 2007) . - pp 269 - 285[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-07021 RAB Revue Centre de documentation En réserve L003 Disponible Spatial-temporal specific neighbourhood rules for cellular automata land-use modelling / Stan Geertman in International journal of geographical information science IJGIS, vol 21 n° 5 (may 2007)
[article]
Titre : Spatial-temporal specific neighbourhood rules for cellular automata land-use modelling Type de document : Article/Communication Auteurs : Stan Geertman, Auteur ; M. Hagoort, Auteur ; Henk F.L. Ottens, Auteur Année de publication : 2007 Article en page(s) : pp 547 - 568 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse diachronique
[Termes IGN] automate cellulaire
[Termes IGN] carte d'occupation du sol
[Termes IGN] Kappa de Cohen
[Termes IGN] modélisation spatiale
[Termes IGN] occupation du sol
[Termes IGN] simulation
[Termes IGN] spatial metrics
[Termes IGN] voisinage (relation topologique)Résumé : (Auteur) This paper explores the necessity of using spatial-temporal specific neighbourhood rules for simulation of urban dynamics at a regional level with the help of a Cellular Automata (CA) land-use model (Environment Explorer). Moreover, it explores a method for formulating these spatial-temporal specific neighbourhood rules. Therein, spatial metrics originating from the field of landscape ecology prove to be very useful, in particular the so-called enrichment factor. Analysis of historical data with the help of these spatial metrics revealed evidence of substantial differences in land-use developments between time periods and regions, for example, differences that should be incorporated in land-use models if applied on a more detailed regional scale. In a case study, micro-scale land-use data incorporated in a CA-model were used to analyse and simulate the urban morphological changes over two time periods in four urban regions in the Netherlands. In this study, regional and time-specific neighbourhood rules performed significantly better than a set of generic neighbourhood rules. In contrast, within current practice, most CA land-use modelling makes use of only one uniform set of neighbourhood rules for performing both large area and regional scale land-use simulations. This study questions this common practice and puts it into perspective. Moreover, it indicates some restrictions in the proposed regionalization of the neighbourhood rules; one which is particularly noteworthy is its time-specific dependency of local developments and circum--stances. Copyright Taylor & Francis Numéro de notice : A2007-136 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810601064892 En ligne : https://doi.org/10.1080/13658810601064892 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28499
in International journal of geographical information science IJGIS > vol 21 n° 5 (may 2007) . - pp 547 - 568[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-07031 RAB Revue Centre de documentation En réserve L003 Disponible 079-07032 RAB Revue Centre de documentation En réserve L003 Disponible Detecting man-made structures and changes in satellite imagery with a content-based information retrieval system built on Self-Organizing Maps / Matthieu Molinier in IEEE Transactions on geoscience and remote sensing, vol 45 n° 4 (April 2007)
[article]
Titre : Detecting man-made structures and changes in satellite imagery with a content-based information retrieval system built on Self-Organizing Maps Type de document : Article/Communication Auteurs : Matthieu Molinier, Auteur ; Jorma Laaksonen, Auteur ; Tuomas Häme, Auteur Année de publication : 2007 Article en page(s) : pp 861 - 874 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] carte de Kohonen
[Termes IGN] détection de changement
[Termes IGN] détection du bâti
[Termes IGN] image à très haute résolution
[Termes IGN] image optique
[Termes IGN] image satellite
[Termes IGN] recherche d'informationRésumé : (Auteur) The increasing amount and resolution of satellite sensors demand new techniques for browsing remote sensing image archives. Content-based querying allows an efficient retrieval of images based on the information they contain, rather than their acquisition date or geographical extent. Self-organizing maps (SOMs) have been successfully applied in the PicSOM system to content-based image retrieval in databases of conventional images. In this paper, we investigate and extend the potential of PicSOM for the analysis of remote sensing data. We propose methods for detecting man-made structures, as well as supervised and unsupervised change detection, based on the same framework. In this paper, a database was artificially created by splitting each satellite image to be analyzed into small images. After training the PicSOM on this imagelet database, both interactive and off-line queries were made to detect man-made structures, as well as changes between two very high resolution images from different years. Experimental results were both evaluated quantitatively and discussed qualitatively, and suggest that this new approach is suitable for analyzing very high resolution optical satellite imagery. Possible applications of this work include interactive detection of man-made structures or supervised monitoring of sensitive sites. Copyright IEEE Numéro de notice : A2007-220 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2006.890580 En ligne : https://doi.org/10.1109/TGRS.2006.890580 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28583
in IEEE Transactions on geoscience and remote sensing > vol 45 n° 4 (April 2007) . - pp 861 - 874[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-07041 RAB Revue Centre de documentation En réserve L003 Disponible GEOIRIS : GEOspatial Information Retrieval and Indexing System-content mining, semantics modeling, and complex queries / C.R. Shyu in IEEE Transactions on geoscience and remote sensing, vol 45 n° 4 (April 2007)
[article]
Titre : GEOIRIS : GEOspatial Information Retrieval and Indexing System-content mining, semantics modeling, and complex queries Type de document : Article/Communication Auteurs : C.R. Shyu, Auteur ; M. Klaric, Auteur ; G.J. Scott, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 839 - 852 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] exploration de données géographiques
[Termes IGN] extraction automatique
[Termes IGN] fusion de données multisource
[Termes IGN] indexation spatiale
[Termes IGN] recherche d'information géographique
[Termes IGN] requête spatialeRésumé : (Auteur) Searching for relevant knowledge across heterogeneous geospatial databases requires an extensive knowledge of the semantic meaning of images, a keen eye for visual patterns, and efficient strategies for collecting and analyzing data with minimal human intervention. In this paper, we present our recently developed content-based multimodal Geospatial Information Retrieval and Indexing System (GeoIRIS) which includes automatic feature extraction, visual content mining from large-scale image databases, and high-dimensional database indexing for fast retrieval. Using these underpinnings, we have developed techniques for complex queries that merge information from heterogeneous geospatial databases, retrievals of objects based on shape and visual characteristics, analysis of multiobject relationships for the retrieval of objects in specific spatial configurations, and semantic models to link low-level image features with high-level visual descriptors. GeoIRIS brings this diverse set of technologies together into a coherent system with an aim of allowing image analysts to more rapidly identify relevant imagery. GeoIRIS is able to answer analysts' questions in seconds, such as "given a query image, show me database satellite images that have similar objects and spatial relationship that are within a certain radius of a landmark." Copyright IEEE Numéro de notice : A2007-218 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2006.890579 En ligne : https://doi.org/10.1109/TGRS.2006.890579 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28581
in IEEE Transactions on geoscience and remote sensing > vol 45 n° 4 (April 2007) . - pp 839 - 852[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-07041 RAB Revue Centre de documentation En réserve L003 Disponible Semantic-sensitive satellite image retrieval / Y. Li in IEEE Transactions on geoscience and remote sensing, vol 45 n° 4 (April 2007)
[article]
Titre : Semantic-sensitive satellite image retrieval Type de document : Article/Communication Auteurs : Y. Li, Auteur ; T.R. Bretschneider, Auteur Année de publication : 2007 Article en page(s) : pp 853 - 860 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données d'images
[Termes IGN] image satellite
[Termes IGN] inférence sémantique
[Termes IGN] recherche d'information
[Termes IGN] réseau bayesienRésumé : (Auteur) Content-based image-retrieval techniques based on query scenes are a powerful means for exploration and mining of large remote sensing image databases. However, the gap between low-level unsupervised extracted features in content-based retrieval and the high-level semantic concepts of user queries limits the performance. Therefore, this paper proposes a specialized approach using a context-sensitive Bayesian network for semantic inference of segmented scenes. The regions' remote sensing related semantic concepts are inferred in a multistage process based on their spectral and textural characteristics as well as the semantics of adjacent regions. During the actual retrieval, the semantics are employed for the extraction of candidate scenes which are evaluated and ranked in a consecutive step. The approach was implemented and compared with a different strategy that utilizes the extracted features from the imagery directly to infer the semantics. In summary, the developed system achieved higher precision and recall rates using the same training data Copyright IEEE Numéro de notice : A2007-219 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2007.892008 En ligne : https://doi.org/10.1109/TGRS.2007.892008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28582
in IEEE Transactions on geoscience and remote sensing > vol 45 n° 4 (April 2007) . - pp 853 - 860[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-07041 RAB Revue Centre de documentation En réserve L003 Disponible Vers un fond vert commun IGN-IFN / Françoise de Blomac in SIG la lettre, n° 86 (avril 2007)PermalinkAssessing the certainty of locations produced by an address geocoding system / C.A. Davis in Geoinformatica, vol 11 n° 1 (March - May 2007)PermalinkFormalizing natural-language spatial relations between linear objects with topological and metric properties / Jingsi Xu in International journal of geographical information science IJGIS, vol 21 n° 3-4 (march - april 2007)PermalinkMesh simplification for building typification / Dirk Burghardt in International journal of geographical information science IJGIS, vol 21 n° 3-4 (march - april 2007)PermalinkUn modèle de raisonnement spatial contextuel pour la navigation maritime / S. 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