Descripteur
Termes IGN > mathématiques > géométrie > figure géométrique
figure géométriqueSynonyme(s)Forme géométriqueVoir aussi |
Documents disponibles dans cette catégorie (605)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
A new stereo algorithm based on snakes / E. Simioni in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 5 (May 2011)
[article]
Titre : A new stereo algorithm based on snakes Type de document : Article/Communication Auteurs : E. Simioni, Auteur ; G. Naletto, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 495 - 507 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] appariement automatique
[Termes IGN] appariement d'images
[Termes IGN] généralisation géométrique (de visualisation)
[Termes IGN] mission spatiale
[Termes IGN] modèle numérique de terrain
[Termes IGN] modèle stéréoscopique
[Termes IGN] reconstruction d'objet
[Termes IGN] surface (géométrie)Résumé : (Auteur) As part of the ongoing activities for the European space mission BepiColombo to Mercury, a new stereo-matching algorithm is here proposed: this algorithm uses deformable surfaces, or snakes, to find a dense disparity map. Subject to both external and internal forces, respectively represented by the similarity function and by smoothness constraints on the disparity map, a "deformable" disparity map evolves from an initial approximate state to an optimal one in which the algorithm has reached convergence. This algorithm is expected to provide one of the image matching tools for the Digital Terrain Model generation procedure that will be used by the BepiColombo stereo camera. To check the algorithm, tests have been performed on synthetic images derived from 3D models of geological features relevant to planetary science. The results show that it is possible to obtain an image measurement accuracy comparable to the one attainable with the Least Squares Matching algorithm. In addition, less object smoothing can be obtained since the object points are not derived by a large scale averaging over a terrain patch, as for example, in area-based methods; this means that more details of the terrain can be captured. Finally, because of the continuity constraint, this method is also expected to be robust in case of blunders in the reconstruction of the parallax field. Numéro de notice : A2011-170 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.5.495 En ligne : https://doi.org/10.14358/PERS.77.5.495 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30948
in Photogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 5 (May 2011) . - pp 495 - 507[article]PostGIS pour les néophytes (4ème partie) / Anonyme in Géomatique expert, n° 80 (01/05/2011)
[article]
Titre : PostGIS pour les néophytes (4ème partie) Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2011 Article en page(s) : pp 40 - 45 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] barycentre
[Termes IGN] centroïde
[Termes IGN] ellipsoïde de référence
[Termes IGN] mesurage de distances
[Termes IGN] opérateur spatial
[Termes IGN] PostGIS
[Termes IGN] primitive géométrique
[Termes IGN] projection
[Termes IGN] système de référence géodésiqueRésumé : (Auteur) Nous continuons notre découverte des principaux opérateurs spatiaux de PostGIS, avec, ce mois-ci, quelques fonctions moins communes. Nous abordons aussi les primitives géodésiques : définition des systèmes de référence, reprojections et mesures de longueur ellipsoïdales vraies. Numéro de notice : A2011-194 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30972
in Géomatique expert > n° 80 (01/05/2011) . - pp 40 - 45[article]Voir aussiRéservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 265-2011031 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001257 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Using horizontal and vertical building structure to constrain indirect sensor orientation / Markus Gerke in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 3 (May - June 2011)
[article]
Titre : Using horizontal and vertical building structure to constrain indirect sensor orientation Type de document : Article/Communication Auteurs : Markus Gerke, Auteur Année de publication : 2011 Article en page(s) : pp 307 - 316 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] bâtiment
[Termes IGN] compensation par faisceaux
[Termes IGN] contour
[Termes IGN] étalonnage de capteur (imagerie)
[Termes IGN] géoréférencement indirect
[Termes IGN] image aérienne oblique
[Termes IGN] orientation du capteur
[Termes IGN] point d'appui
[Termes IGN] programmation par contraintes
[Termes IGN] scène
[Termes IGN] séquence d'images
[Termes IGN] Ultra Léger MotoriséRésumé : (Auteur) This paper presents a method to integrate linear horizontal, vertical and right-angled scene structures into the bundle adjustment of image sequences. An increasing number of airborne image acquisition systems is available and equipped with non-metric small- or medium-frame cameras and no or insufficiently accurate INS devices. In cases where the data is to be used for the production of geo-spatial data, where a certain accuracy and precision is required, an indirect sensor orientation, possibly including self-calibration, needs to be performed. The idea which led to the presented approach is to reduce the number of GCPs necessary for this task by applying the mentioned scene structures. The method directly uses the linear structures, visible at man-made objects as fictive observations within the adjustment, while self-calibration of intrinsic camera parameters and lens distortion is included as well. Experiments with two datasets demonstrate that, through this method, only limited GCP information is required to obtain satisfactory results. In fact, in one experiment using oblique images, several scene constraints were provided and only the datum was defined by ground control. The residuals at check points from this setup were similar to the traditional case where several well-distributed GCPs were available in the scene. In the second experiment the ability of this approach to support the bundle adjustment was shown for a UAV dataset. Although no GCP and camera calibration information was available, the visual inspection of adjusted object points and the residuals at horizontal structures confirmed the ability of the method to align an image block with the structure, as embodied in the defined scene constraints. Despite the convincing outcome of the experiments, it needs to be mentioned that some manual work is still involved in defining the constraints. In future work the issue of automation will be addressed. Numéro de notice : A2011-114 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.11.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.11.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30894
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 3 (May - June 2011) . - pp 307 - 316[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2011031 SL Revue Centre de documentation Revues en salle Disponible
Titre : Validating a 3D topological structure of a 3D space partition Type de document : Article/Communication Auteurs : Bregje Brugman, Auteur ; Theo Tijssen, Auteur ; Peter J. M. Van Oosterom, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 01/04/2011 Conférence : AGILE 2011, 14th International Conference on Geographic Information Science, Advancing Geoinformation Science for a Changing World 18/04/2011 21/04/2011 Utrecht Pays-Bas Proceedings Springer Importance : pp 359 - 378 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données localisées 3D
[Termes IGN] modèle conceptuel de données localisées
[Termes IGN] modèle topologique de données
[Termes IGN] Oracle spatial
[Termes IGN] partition
[Termes IGN] primitive géométrique
[Termes IGN] règle
[Termes IGN] solideRésumé : (Auteur) The goal of this research is to develop a 3D topological structure to represent a 3D space partition with validation functionality and support for conversions from topological to geometrical primitives. Several 3D topological structures have been presented in the past, mainly by researchers. The technical (implementation) model developed in this paper is based on the conceptual model of the ISO 19107 spatial schema' standard and consists of four topological primitives: node, edge, face, and volume, which are related to each other via their (co)boundary relationships. In our setting, only linear primitives (no curves) are supported and no isolated and dangling primitives are allowed. In our model, the rings, the shells, and the orientation play key roles within the topological structure and the functions that implement the geometrical realization. There was no formal definition of a valid 3D topological structure available and this paper presents such a definition, which is the main novel contribution. This definition is presented in three levels, where at every next level the definition is further refined such that finally a set of rules is proposed, which can be implemented unambiguously. In order to validate a 3D topological structure, the involved volumes must be valid as well as the whole structure, which means the relationships between the volumes. The rules for a valid structure have been implemented on top of Oracle Spatial and tested with artificial and real-world test data. Numéro de notice : C2011-049 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64365 Documents numériques
en open access
14516_ctap_validating_3d_topological_structure.pdfAdobe Acrobat PDF City model enrichment / P. Smart ; J. Quinn ; C. Jones in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 2 (March - April 2011)
[article]
Titre : City model enrichment Type de document : Article/Communication Auteurs : P. Smart, Auteur ; J. Quinn, Auteur ; C. Jones, Auteur Année de publication : 2011 Article en page(s) : pp 223 - 234 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] données localisées libres
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] point d'appui
[Termes IGN] polygone
[Termes IGN] réalité augmentée
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] web 2.0Résumé : (Auteur) The combination of mobile communication technology with location and orientation aware digital cameras has introduced increasing interest in the exploitation of 3D city models for applications such as augmented reality and automated image captioning. The effectiveness of such applications is, at present, severely limited by the often poor quality of semantic annotation of the 3D models. In this paper, we show how freely available sources of georeferenced Web 2.0 information can be used for automated enrichment of 3D city models. Point referenced names of prominent buildings and landmarks mined from Wikipedia articles and from the OpenStreetMaps digital map and Geonames gazetteer have been matched to the 2D ground plan geometry of a 3D city model. In order to address the ambiguities that arise in the associations between these sources and the city model, we present procedures to merge potentially related buildings and implement fuzzy matching between reference points and building polygons. An experimental evaluation demonstrates the effectiveness of the presented methods. Numéro de notice : A2011-075 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.12.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.12.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30856
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 2 (March - April 2011) . - pp 223 - 234[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2011021 SL Revue Centre de documentation Revues en salle Disponible 3D building model reconstruction from multi-view aerial imagery and Lidar data / Liang Cheng in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 2 (February 2011)PermalinkContributions to the 3D city modeling. 3D polyhedral building model reconstruction from aerial images & 3D facade modeling from terrestrial 3D point cloud and images / Karim Hammoudi (2011)PermalinkHow to achieve consistency for 3D city models / G. Groger in Geoinformatica, vol 15 n° 1 (January 2011)PermalinkPermalinkPermalinkPermalinkAdjustment computation of HASM : a high-accuracy and high speed method / T. Yue in International journal of geographical information science IJGIS, vol 24 n°11-12 (december 2010)PermalinkAlgorithms for automatic matching of polygons or closed curves derived from different images / Y. Avrahami in SaLIS Surveying and land information science, vol 70 n° 4 (Winter 2010)PermalinkEqual arc ratio projection and a new spherical triangle quadtree model / Y. Wen in International journal of geographical information science IJGIS, vol 24 n°11-12 (december 2010)PermalinkMulti close-range image matching based on a self-adaptive triangle constraint / Q. Zhu in Photogrammetric record, vol 25 n° 132 (December 2010 - February 2011)PermalinkResults and comparisons of a local and a regional reprocessed GNSS network / Juliette Legrand in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)PermalinkDirected movements in probabilistic time geography / Stephan Winter in International journal of geographical information science IJGIS, vol 24 n° 9 (september 2010)PermalinkConstrained free space diagrams: a tool for trajectory analysis / Kevin Buchin in International journal of geographical information science IJGIS, vol 24 n°7-8 (july 2010)PermalinkSphere-to-Sphere projections : proportional enlargement on a spherical surface / B. Kronenfeld in Cartographica, vol 45 n° 2 (June 2010)PermalinkObtaining high fidelity triangular Regular Network from only DEM points / T. Gökgöz in Cartographic journal (the), vol 47 n° 2 (May 2010)PermalinkTriangulation method for area-line geometry-type changes in map generalisation / H. Selvi in Cartographic journal (the), vol 47 n° 2 (May 2010)PermalinkDelineation and geometric modeling of road networks / C. Poullis in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)Permalink3D segmentation of forest structure using an adaptive mean shift based procedure / António Ferraz (2010)PermalinkAssessment of a numerical method for computing the spherical harmonic coefficients of the gravitational potential of a constant density polyhedron / Olivier Jamet (2010)PermalinkPermalinkPermalinkPermalinkModelling the erectheion: extracting information from very large datasets / J. Beraldin in GIM international, vol 23 n° 11 (November 2009)PermalinkSIG et cartographie pour MacIntosh / Anonyme in Géomatique expert, n° 71 (octobre - novembre 2009)PermalinkMultihulls: Spatial representation and processing with variable shape fidelity, applied to gazetteers / J.T. Hastings in Transactions in GIS, vol 13 n°5-6 (October/december 2009)PermalinkRecursive algorithms for the computation of the potential harmonic coefficients of a constant density polyhedron / Dimitrios Tsoulis in Journal of geodesy, vol 83 n° 10 (October 2009)PermalinkPrecise, automatic and fast method for vanishing point detection / Mahzad Kalantari in Photogrammetric record, vol 24 n° 127 (September - November 2009)PermalinkLes réseaux de polygones de Thiessen : application à la géolocalisation robuste de caravanserails décrits dans les récits anciens de voyageurs / André Del in Géomatique expert, n° 70 (01/09/2009)PermalinkStreet-based topological representations and analyses for predicting traffic flow in GIS / Bin Jiang in International journal of geographical information science IJGIS, vol 23 n°9-10 (september 2009)PermalinkAssessment of sliver polygons in geographical vector data / M. Delafontaine in International journal of geographical information science IJGIS, vol 23 n° 6 (june 2009)PermalinkA geodesic map projection for quadrilaterals / J. Crider in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)PermalinkUrban area and building detection using SIFT: Keypoints and Graph Theory / B. Simarcek in IEEE Transactions on geoscience and remote sensing, vol 47 n° 4 (April 2009)PermalinkDynamic hybrid terrain representation based on convexity limits identification / M. Bóo in International journal of geographical information science IJGIS, vol 23 n°3-4 (march - april 2009)PermalinkPermalinkExtracting 3D polyhedral building models from aerial images using a featureless and direct approach / Fadi Dornaika (2009)PermalinkLes recherches sur les réseaux au laboratoire COGIT : bilan et perspectives [diaporama] / Jean-François Gleyze (2009)PermalinkVerification of topographic road centerline data using ALOS/PRISM images: implementation / H. Fujimura in Bulletin of the Geographical survey institute, vol 56 (December 2008)PermalinkA Polygonal approach for automation in extraction of serial modular roofs / Y. Avrahami in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 11 (November 2008)PermalinkUsing a binary space partitioning tree for reconstructing polyhedral building models from airborne Lidar data / Gunho Sohn in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 11 (November 2008)PermalinkGeneralization-oriented road line classification by means of an artificial neural network / J.L. Garcia Balboa in Geoinformatica, vol 12 n° 3 (September - November 2008)PermalinkHigh resolution elevation data derived from stereoscopic CORONA imagery ground control: an approach using IKONOS and SRTM data / Nikolaos Galiatsatos in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 9 (September 2008)PermalinkShaping polyhedral buildings by the fusion of vector maps and lidar point clouds / L.C. Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 9 (September 2008)PermalinkGeneralized 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)PermalinkSpatial objects / R. Thompson in GIM international, vol 22 n° 7 (July 2008)PermalinkA simplicial complex-based DBMS approach to 3D topographic data modelling / F. Penninga in International journal of geographical information science IJGIS, vol 22 n° 6-7 (june 2008)Permalink