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The annotation process in OpenStreetMap / P. Mooney in Transactions in GIS, vol 16 n° 4 (August 2012)
[article]
Titre : The annotation process in OpenStreetMap Type de document : Article/Communication Auteurs : P. Mooney, Auteur ; P. Corcoran, Auteur Année de publication : 2012 Article en page(s) : pp 561 - 579 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] analyse comparative
[Termes IGN] attribut
[Termes IGN] données localisées des bénévoles
[Termes IGN] objet géographique
[Termes IGN] ontologie
[Termes IGN] OpenStreetMapRésumé : (Auteur) In this article we describe the analysis of 25,000 objects from the OpenStreetMap (OSM) databases of Ireland, United Kingdom, Germany, and Austria. The objects are selected as exhibiting the characteristics of “heavily edited” objects. We consider “heavily edited” objects as having 15 or more versions over the object's lifetime. Our results indicate that there are some serious issues arising from the way contributors tag or annotate objects in OSM. Values assigned to the “name” and “highway” attributes are often subject to frequent and unexpected change. However, this “tag flip-flopping” is not found to be strongly correlated with increasing numbers of contributors. We also show problems with usage of the OSM ontology/controlled vocabularly. The majority of errors occurring were caused by contributors choosing values from the ontology “by hand” and spelling these values incorrectly. These issues could have a potentially detrimental effect on the quality of OSM data while at the same time damaging the perception of OSM in the GIS community. The current state of tagging and annotation in OSM is not perfect. We feel that the problems identified are a combination of the flexibility of the tagging process in OSM and the lack of a strict mechanism for checking adherence to the OSM ontology for specific core attributes. More studies related to comparing the names of features in OSM to recognized ground-truth datasets are required. Numéro de notice : A2012-366 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01306.x Date de publication en ligne : 03/05/2012 En ligne : https://doi.org/10.1111/j.1467-9671.2012.01306.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31812
in Transactions in GIS > vol 16 n° 4 (August 2012) . - pp 561 - 579[article]Attributierte Grammatiken zur Rekonstruktion und Interpretation von Fassaden / J. Schmidtwilken (2012)
Titre : Attributierte Grammatiken zur Rekonstruktion und Interpretation von Fassaden Titre original : [Grammaires attribuées pour la reconstruction et l'interprétation des façades] Type de document : Thèse/HDR Auteurs : J. Schmidtwilken, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2012 Collection : DGK - C Sous-collection : Dissertationen num. 686 Importance : 169 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5098-3 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] façade
[Termes IGN] objet géographique complexe
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] semis de pointsRésumé : (Auteur) The needs and benefits of highly detailed 3D city and building models is opposed to their expensive acquisition. Though the automatic derivation of simplified roof structures from aerial images or laser altimetry is mostly solved, only a few approaches for the automatic reconstruction of facade structures from terrestrial data were presented yet. Most of the existing work is on the interpretation of large, planar facades that are reduced to a regular arrangement of windows. Therefore, it lacks in both, the reconstruction of additional facade elements such as stairs or doors as well as methods for the interpretation of heterogeneous a,nd complex facades with protrusions, oriels and only a small number of windows.
This thesis deals with the interpretation of 3D point clouds that have been captured by terrestrial laser scanning of urban areas. The focus is on 3D point clouds of heterogeneous facades, that are characterized by their narrow width and by protrusions and oriels. The main contribution is the reconstruction and interpretation of facades by a parser that combines attribute grammars and robust estimators. Due to the generic attribute grammar the estimation of models with a previously unknown number of parameters is possible and the heterogeneity of the objects is thus considered.
The concept is distinguished by the heavily integration of prior knowledge. The geometric and the semantic model of facades are defined and transferred to the attributed grammar. Furthermore, the probability densities of the shape and position parameters of the considered facade parts are estimated and Incorporated in the attributed grammar. The corresponding a priori probabilities are essential for the presented robust estimator MOSAP and the parsing algorithm parseSd.
The relations between single parts of a facade are mapped to the attribute grammar. Therefore, the grammar represents the complex structures of facades and constitutes the foundation of the parsing algorithm. Beginning with the most common symbol parse3d iteratively applies production rules and, thus, generates hypothesis represented by derivation trees. Finally the most likely derivation tree is selected. Both, the selection of the symbol to be derived and the selection of the production rule to be applied base on the a priori probabilities and the densities that are estimated from the context information like the parameters of already reconstructed objects or subsets of the 3D point cloud. The interface between the grammar and the 3D point clouds is realized by the robust estimator MOSAP and guards. The latter determine the likelihood of a production rule and, therefore, provide a selection criterion.
The symbols of the grammar t.iat are geometrically defined by a small set of parameters axe reconstructed by a robust estimator. MOSAP (Model Based Sampling and Prediction) bases on the hypothesize-and-verify paradigm and is characterized by the model-based sampling strategy that takes advantage of the probability densities of the shape and position parameters of the objects to be reconstructed. Furthermore, MOSAP evaluates the hypothesis by the newly introduced goodness of prediction criterion.Numéro de notice : 14499 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62665 Documents numériques
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14499_dgk-c-686.pdfAdobe Acrobat PDF Provably correct and complete transaction rules for updating 3D city models / G. Groger in Geoinformatica, vol 16 n° 1 (January 2012)
[article]
Titre : Provably correct and complete transaction rules for updating 3D city models Type de document : Article/Communication Auteurs : G. Groger, Auteur ; L. Plumer, Auteur Année de publication : 2012 Article en page(s) : pp 131 - 164 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] base de règles
[Termes IGN] CityGML
[Termes IGN] cohérence géométrique
[Termes IGN] exhaustivité des données
[Termes IGN] mise à jour de base de données
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] objet géographique complexeRésumé : (Auteur) The shapes of our cities change very frequently. These changes have to be reflected in data sets representing urban objects. However, it must be assured that frequent updates do not affect geometric-topological consistency. This important aspect of spatial data quality guarantees essential assumptions on which users and applications of 3D city models rely: viz. that objects do not intersect, overlap or penetrate mutually, or completely cover one another. This raises the question how to guarantee that geometric-topological consistency is preserved when data sets are updated. Hence, there is a certain risk that plans and decisions which are based on these data sets are erroneous and that the tremendous efforts spent for data acquisition and updates become vain. In this paper, we solve this problem by presenting efficient transaction rules for updating 3D city models. These rules guarantee that geometric-topological consistency is preserved (Safety) and allow for the generation of arbitrary consistent 3D city models (Completeness). Safety as well as completeness is proven with mathematical rigor, guaranteeing the reliability of our method. Our method is applicable to 3D city models, which define—besides the terrain surface—complex spatial objects like buildings with rooms and storeys as interior structures, as well as bridges and tunnels. Those objects are represented as aggregations of solids, and their surfaces are complex from a topology point of view. 3D GIS models like CityGML, which are widely used to represent cities, provide the means to define semantics, geometry and topology, but do not address the problem of maintaining consistency. Hence, our approach complements CityGML. Numéro de notice : A2012-084 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-011-0127-6 Date de publication en ligne : 25/05/2011 En ligne : https://doi.org/10.1007/s10707-011-0127-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31532
in Geoinformatica > vol 16 n° 1 (January 2012) . - pp 131 - 164[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Using snakes for the registration of topographic road database objects to ALS features / J. Göpfert in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 6 (November 2011)
[article]
Titre : Using snakes for the registration of topographic road database objects to ALS features Type de document : Article/Communication Auteurs : J. Göpfert, Auteur ; Franz Rottensteiner, Auteur ; Christian Heipke, Auteur Année de publication : 2011 Article en page(s) : pp 858 - 871 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] algorithme snake
[Termes IGN] appariement de données localisées
[Termes IGN] base de données routières
[Termes IGN] contour
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] données topographiques
[Termes IGN] modèle numérique de paysage
[Termes IGN] objet géographique
[Termes IGN] optimisation (mathématiques)
[Termes IGN] réseau routierRésumé : (Auteur) For historical reasons many national mapping agencies store their topographic data in a dual system consisting of a Digital Landscape Model (DLM) and a Digital Terrain Model (DTM). The DLM contains 2D vector data representing objects on the Earth’s surface, such as roads and rivers, whereas the DTM is a 2.5D representation of the related height information, often acquired by Airborne Laser Scanning (ALS). Today, many applications require reliable 3D topographic data. Therefore, it is advantageous to convert the dual system into a 3D DLM. However, as a result of different methods of acquisition, processing, and modelling, the registration of the two data sets often presents difficulties. Thus, a straightforward integration of the DTM and DLM might lead to inaccurate and semantically incorrect 3D objects. $In this paper we propose a new method for the fusion of the two data sets that exploits parametric active contours (also called snakes), focusing on road networks. For that purpose, the roads from a DLM initialise the snakes, defining their topology and their internal energy, whereas ALS features exert external forces to the snake via the image energy. After the optimisation process the shape and position of the snakes should coincide with the ALS features. With respect to the robustness of the method several known modifications of snakes are combined in a consistent framework for DLM road network adaptation. One important modification redefines the standard internal energy and thus the geometrical model of the snake in order to prevent changes in shape or position not caused by significant features in the image energy. For this purpose, the initial shape is utilized creating template-like snakes with the ability of local adaptation. This is one crucial point towards the applicability of the entire method considering the strongly varying significance of the ALS features. Other concepts related to snakes are integrated which enable our method to model network and ribbon-like characteristics simultaneously. Additionally, besides ALS road features information about context objects, such as bridges and buildings, is introduced as part of the image energy to support the optimisation process. Meaningful examples are presented that emphasize and evaluate the applicability of the proposed method. Numéro de notice : A2011-473 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.08.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.08.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31367
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 6 (November 2011) . - pp 858 - 871[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-2011061 SL Revue Centre de documentation Revues en salle Disponible
[article]
Titre : Représentation 2D de bâti 3D complexe Type de document : Article/Communication Auteurs : N. Cadoux, Auteur Année de publication : 2011 Article en page(s) : 7 p. ; pp 52 - 58 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] AutoCad Map 3D
[Termes IGN] bati
[Termes IGN] MapGuide
[Termes IGN] objet géographique 3D
[Termes IGN] objet géographique complexe
[Termes IGN] représentation cartographique
[Termes IGN] représentation cartographique 2D
[Termes IGN] système d'information géographique
[Termes IGN] système d'information urbainRésumé : (Auteur) De plus en plus d'architectes conçoivent des bâti-ments complexes, aux formes gauches, avec force surplombs. Parfois, ces projets innovants prennent place sur des dalles où plusieurs niveaux d'urba-nisation se côtoient. Ces pratiques nouvelles sou-lèvent le problème de leur représentation dans des SIG, qu'ils soient 2D, 2,5D ou 3D. Compte-rendu d'une étude menée au cabinet Bloy pour ses be-soins propres. Numéro de notice : A2011-320 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans En ligne : http://www.geomag.fr/sites/default/files/geo81_pp52-58_carto.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31099
in Géomatique expert > n° 81 (01/07/2011) . - 7 p. ; pp 52 - 58[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-2011041 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001041 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt User interactive multiple aerial view analysis for reconstructing a large number of 3D architectural models / S. Lee in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 4 (July - August 2011)PermalinkAéroports : objets géographiques complexes / Françoise de Blomac in SIG la lettre, n° 126 (avril 2011)PermalinkConnectivity in the regular polytope representation / R. Thompson in Geoinformatica, vol 15 n° 2 (April 2011)PermalinkInterpreting motion events of pairs of moving objects / B. Gottfried in Geoinformatica, vol 15 n° 2 (April 2011)PermalinkEvaluation of analytical measures of map legibility / Hanna Stigmar in Cartographic journal (the), vol 48 n° 1 (February 2011)PermalinkAn evaluation of the impact of cartographic generalisation on length measurement computed from linear vector databases / Jean-François Girres (2011)PermalinkModeling the scale dependences of topological relations between lines and regions induced by reduction of attributes / S. Du in International journal of geographical information science IJGIS, vol 24 n°11-12 (december 2010)PermalinkAn object-based conceptual framework and computational method for representing and analyzing coastal morphological changes / H. Liu in International journal of geographical information science IJGIS, vol 24 n°7-8 (july 2010)PermalinkEnrichissement automatique de données par analyse spatiale pour la généralisation de réseaux / Guillaume Touya in Revue internationale de géomatique, vol 20 n° 2 (juin - aout 2010)PermalinkReal world objects in geobia through the exploitation of existing digital cartography and image segmentation / G. Smith in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 2 (February 2010)Permalink