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Generalized network Voronoi diagrams: concepts, computational methods, and applications / Atsuyuki Okabe in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)
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Titre : Generalized network Voronoi diagrams: concepts, computational methods, and applications Type de document : Article/Communication Auteurs : Atsuyuki Okabe, Auteur ; T. Satoh, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 965 - 994 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] diagramme de Voronoï
[Termes IGN] distance euclidienne
[Termes IGN] distance pondérée
[Termes IGN] graphe planaire
[Termes IGN] milieu urbain
[Termes IGN] plus proche voisin, algorithme du
[Termes IGN] polygone
[Termes IGN] polyligne
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In the real world, there are many phenomena that occur on a network or alongside a network; for example, traffic accidents on highways and retail stores along streets in an urbanized area. In the literature, these phenomena are analysed under the assumption that distance is measured with Euclidean distance on a plane. This paper first examines this assumption and shows an empirical finding that Euclidean distance is significantly different from the shortest path distance in an urbanized area if the distance is less than 500 m. This implies that service areas in urbanized areas cannot be well represented by Voronoi diagrams defined on a plane with Euclidean distance, termed generalized planar Voronoi diagrams. To overcome this limitation, second, this paper formulates six types of Voronoi diagrams defined on a network, termed generalized network Voronoi diagrams, whose generators are given by points, sets of points, lines and polygons embedded in a network, and whose distances are given by inward/outward distances, and additively/multiplicatively weighted shortest path distances. Third, in comparison with the generalized planar Voronoi diagrams, the paper empirically shows that the generalized network Voronoi diagrams can more precisely represent the service areas in urbanized areas than the corresponding planar Voronoi diagrams. Fourth, because the computational methods for constructing the generalized planar Voronoi diagrams in the literature cannot be applied to constructing the generalized network Voronoi diagrams, the paper provides newly developed efficient algorithms using the 'extended' shortest path trees. Last, the paper develops user-friendly tools (that are included in SANET, a toolbox for spatial analysis on a network) for executing these computational methods in a GIS environment. Copyright Taylor & Francis Numéro de notice : A2008-311 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701587891 En ligne : https://doi.org/10.1080/13658810701587891 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29304
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 965 - 994[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible Image-based quality assessment of road databases / Markus Gerke in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)
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Titre : Image-based quality assessment of road databases Type de document : Article/Communication Auteurs : Markus Gerke, Auteur ; Christian Heipke, Auteur Année de publication : 2008 Article en page(s) : pp 871 - 894 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse de sensibilité
[Termes IGN] base de données routières
[Termes IGN] connexité (graphes)
[Termes IGN] évaluation des données
[Termes IGN] graphe
[Termes IGN] mise à jour de base de données
[Termes IGN] modèle sémantique de données
[Termes IGN] qualité des données
[Termes IGN] raisonnement spatial
[Termes IGN] relation topologique
[Termes IGN] traitement d'imageRésumé : (Auteur) In this paper, an approach to the automatic quality assessment of existing geo-spatial data is presented. The necessary reference information is derived automatically from up-to-date digital remotely sensed images using image analysis methods. The focus is on the quality assessment of roads as these are among the most frequently changing objects in the landscape. In contrast to existing approaches for quality control of road data, the data to be assessed and the objects extracted from the images are modelled and processed together. A geometric-topologic relationship model for the roads and their surroundings is defined. Context objects such as rows of trees support the quality assessment of road vector data as they may explain gaps in road extraction. The extraction and explicit incorporation of these objects in the assessment of a given road database give stronger support for or against its correctness. During the assessment existing relations between road objects from the database and extracted objects are compared to the modelled relations. The certainty measures of the objects are integrated into this comparison. Normally, more than one extracted object gives evidence for a road database object; therefore, a reasoning algorithm which combines evidence given by the extracted objects is used. If the majority of the total evidence argues for the database object and if a certain amount of this database object is covered by extracted objects, the database object is assumed to be correct, i.e. it is accepted, otherwise it is rejected. The procedure is embedded into a two-stage graph-based approach which exploits the connectivity of roads and results in a reduction of false alarms. The algorithms may be incorporated into a semi-automatic environment, where a human operator only checks those objects that have been rejected. The experimental results confirm the importance of the employed advanced statistical modelling. The overall approach can reliably assess the roads from the given database, using road and context objects which have been automatically extracted from remotely sensed imagery. Sensitivity analysis shows that in most cases the chosen two-stage graph-approach reduces the number of false decisions. Approximately 66% of the road objects have been accepted by the developed approach in an extended test area, 1% has been accepted though incorrect. Those false decisions are mainly related to the lack of modelling road junction areas. Copyright Taylor & Francis Numéro de notice : A2008-306 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701703258 En ligne : https://doi.org/10.1080/13658810701703258 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29299
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 871 - 894[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible Terrestrial laser scan survey and 3D TIN model construction of urban buildings in a geospatial database / T. Tang in Geocarto international, vol 23 n° 4 (August - September 2008)
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Titre : Terrestrial laser scan survey and 3D TIN model construction of urban buildings in a geospatial database Type de document : Article/Communication Auteurs : T. Tang, Auteur ; W. Zhao, Auteur Année de publication : 2008 Article en page(s) : pp 259 - 272 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] base de données localisées
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] lasergrammétrie
[Termes IGN] modélisation 3D
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] texturage
[Termes IGN] Triangulated Irregular NetworkRésumé : (Auteur) A new method applying close range laser scan (Lidar) survey in capturing 3D objects was presented in this study. One linear laser source Lidar was used for the survey of the objects. This approach is particularly essential for 3D modelling of urban buildings in a geospatial database. Data calibration and merging were conducted for combing point cluster datasets surveyed from different locations and angles of one object in order to generate a 3D data model for the entire object. The point cluster data were transformed and converted into a triangulated irregular network (TIN) mesh model in a 3D geospatial database. The TIN mesh model was compressed and simplified by applying a computing script of surface variability priority parameters. The digital surface images and textures of the building object were draped onto the 3D TIN model according to their coordinate locations. This research provides a direct and fast means of capturing 3D objects on the Earth's surface in a geospatial database. Copyright Taylor & Francis Numéro de notice : A2008-300 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040801915917 Date de publication en ligne : 17/07/2008 En ligne : https://doi.org/10.1080/10106040801915917 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29293
in Geocarto international > vol 23 n° 4 (August - September 2008) . - pp 259 - 272[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-08041 RAB Revue Centre de documentation En réserve L003 Disponible
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Titre : 3D-model of Siberian fortress Type de document : Article/Communication Auteurs : M. Anikushkin, Auteur ; S. Kotelnikov, Auteur Année de publication : 2008 Article en page(s) : pp 13 - 15 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] archéométrie
[Termes IGN] carte topographique
[Termes IGN] champ magnétique local
[Termes IGN] données laser
[Termes IGN] fortification
[Termes IGN] instrumentation Trimble
[Termes IGN] lasergrammétrie
[Termes IGN] lever souterrain
[Termes IGN] modèle numérique de surface
[Termes IGN] modélisation 3D
[Termes IGN] restitution
[Termes IGN] Sibérie
[Termes IGN] site archéologique
[Termes IGN] Triangulated Irregular NetworkRésumé : (Auteur) Exploration and preservation of Por-Bajin fortress, testimony to the former presence of ancient civilisation in the wildness of Siberia, is one of the largest-scale projects in modern archeology. Combining terrestrial laser-scanning, magnetic field and electrical resistance data revealed anomalies that had remained concealed during fieldwork and in aerial photos. Copyright Reed Business Information Numéro de notice : A2008-218 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29213
in GIM international > vol 22 n° 7 (July 2008) . - pp 13 - 15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-08071 RAB Revue Centre de documentation En réserve L003 Disponible
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Titre : Oracle 11G and Oracle spatial 11G Type de document : Article/Communication Auteurs : O. Ertac, Auteur Année de publication : 2008 Article en page(s) : pp 28 - 31 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] données localisées 3D
[Termes IGN] fonctionnalité
[Termes IGN] Oracle
[Termes IGN] Oracle spatial
[Termes IGN] service web géographique
[Termes IGN] Triangulated Irregular NetworkRésumé : (Auteur) We first met Oracle Spatial more than ten years ago. The latest version, Oracle Spatial 11g, includes native support in Oracle Database 11g for all geospatial data types and models, including vector and raster data and topology and network models, meeting the needs of advanced geospatial systems. This article highlights Oracle Spatial features in 11g. Copyright GEOinformatics Numéro de notice : A2008-293 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29286
in Geoinformatics > vol 11 n° 5 (01/07/2008) . - pp 28 - 31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-08051 SL Revue Centre de documentation Revues en salle Disponible Un algorithme génétique pour le transport à la demande en convergence : application au territoire de la communauté d'agglomération du Pays de Montbéliard / R. Chevrier in Revue internationale de géomatique, vol 18 n° 2 (juin - aout 2008)
PermalinkExtensions of GAP-tree and its implementation based on a non-topological data model / C. Cheng in International journal of geographical information science IJGIS, vol 22 n° 6-7 (june 2008)
PermalinkModelling three-dimensional [3D] geoscientific fields with the Voronoi diagram and its dual / Hugo Ledoux in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
PermalinkA new approach to quantifying spatial contiguity using graph theory and spatial interaction / X. Wu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
PermalinkSensitivity analysis of spatially aggregated responses: a gradient-based method / F. Pantus in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
PermalinkSweep-line algorithm for constrained Delaunay triangulation / V. Domiter in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
PermalinkApproximating the visible region of a point on a terrain / B. Ben-Moshe in Geoinformatica, vol 12 n° 1 (March - May 2008)
PermalinkA multi-parameter approach to automated building grouping and generalization / Hongxiang Yan in Geoinformatica, vol 12 n° 1 (March - May 2008)
PermalinkIdentifying factors of geographic event conceptualisation / Alexander Klippel in International journal of geographical information science IJGIS, vol 22 n° 1-2 (february 2008)
PermalinkWeb service approaches for providing enriched data structures to generalisation operators / Moritz Neun in International journal of geographical information science IJGIS, vol 22 n° 1-2 (february 2008)
PermalinkLa géomatique au service de la caractérisation automatique des réseaux hydrographiques / Adrien Paget in Physio-Géo, vol 2 (janvier 2008)
PermalinkPermalinkPermalinkPermalinkPermalinkDiagnosis in systems based on an informed tree search strategy: application to cartographic generalisation / Patrick Taillandier (2008)
PermalinkPermalinkPermalinkPermalinkKnowledge revision in systems based on an informed tree search strategy: application to cartographic generalisation / Patrick Taillandier (2008)
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