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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
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14516_ctap_validating_3d_topological_structure.pdfAdobe Acrobat PDF Acquisition of the 3D boundary of the Triglav glacier from archived non-metric panoramic images / Mihaela Triglav Cekada in Photogrammetric record, vol 26 n° 133 (March - May 2011)
[article]
Titre : Acquisition of the 3D boundary of the Triglav glacier from archived non-metric panoramic images Type de document : Article/Communication Auteurs : Mihaela Triglav Cekada, Auteur ; R. Radovanovic, Auteur ; Dalibor Radovan, Auteur ; M. Gabrovec, Auteur ; Mojca Kosmatin-Fras, Auteur Année de publication : 2011 Article en page(s) : pp 111 - 129 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] alpes orientales
[Termes IGN] analyse diachronique
[Termes IGN] angle vertical
[Termes IGN] chambre non métrique
[Termes IGN] chambre panoramique
[Termes IGN] données localisées 3D
[Termes IGN] glacier
[Termes IGN] modèle numérique de surface
[Termes IGN] montagne
[Termes IGN] numérisation de photographie
[Termes IGN] photographie argentique
[Termes IGN] Slovénie
[Termes IGN] volume (grandeur)Résumé : (Auteur) A panoramic, non-metric, Horizont camera has been used for regular, monthly, close-range photography of the rapidly retreating Triglav glacier in Slovenia since 1976. The unfavourable geometry of the convergent images taken from the two camera stations has made any direct stereoscopic observation and recording impossible. The aim of this research was to define the most useful method for acquiring 3D data from these panoramic, convergent images. The Horizont camera was calibrated and three methods were then tested: the generation of pseudo-orthophotographs, the application of 2D clinometry and the interactive orientation of a detailed digital elevation model (DEM) on the images. The third turned out to be the only method suitable for determining the boundary of the Triglav glacier. The interactive orientation of a detailed DEM on the Horizont images is described in detail. The 3D glacier boundary can be acquired from individual Horizont images (camera stations A and B) enabling the computation of the glacier’s area and theoretical volume. By repeating the glacier boundary acquisition for different orientation parameters, the standard deviations of the glacier area and theoretical volume were computed. Because of the more precise average area and volume measurements achieved with the camera station B images, only these were chosen for the glacier disappearance study. Every third year between 1976 and 2005 the Horizont images were used to compute the changes in the area and volume of the glacier. The glacier area was found to have reduced to 8% of its earlier size, from 15 ha in 1976 to 1·2 ha in 2000. However, owing to harsher than average winters since then the decline in the glacier area was found to have slowed in the past decade (2000 to 2009). The glacier’s theoretical volume decreased roughly exponentially from 1976 to 2005 Numéro de notice : A2011-079 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00622.x Date de publication en ligne : 16/03/2011 En ligne : https://doi.org/10.1111/j.1477-9730.2011.00622.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30860
in Photogrammetric record > vol 26 n° 133 (March - May 2011) . - pp 111 - 129[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-2011011 RAB Revue Centre de documentation En réserve L003 Disponible City model enrichment / P. Smart ; J. Quinn ; C. Jones in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 2 (March - April 2011)
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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
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Code-barres Cote Support Localisation Section Disponibilité 081-2011021 SL Revue Centre de documentation Revues en salle Disponible Incremental segmentation of lidar point clouds with an octree-structured voxel space / M. Wang in Photogrammetric record, vol 26 n° 133 (March - May 2011)
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Titre : Incremental segmentation of lidar point clouds with an octree-structured voxel space Type de document : Article/Communication Auteurs : M. Wang, Auteur ; Yi-Hsing Tseng, Auteur Année de publication : 2011 Article en page(s) : pp 32 - 57 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] coplanarité
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] octree
[Termes IGN] reconstruction d'objet
[Termes IGN] segmentation
[Termes IGN] semis de points
[Termes IGN] voxelRésumé : (Auteur) Lidar (light detection and ranging) data implicitly contains abundant three-dimensional spatial information. The segmentation of lidar point clouds is the key procedure for transforming implicit spatial information into explicit spatial information. Common criteria used for point cloud segmentation are proximity and coherence of point distribution. An effective segmentation algorithm may apply various steps or combinations of criteria depending on the application. This paper proposes a four-step segmentation method for lidar point clouds to deliver incremental segmentation results. Segmentation results of each step can provide the fundamental data for the next step. In the first step, the input point cloud is organised into an octree-structured voxel space, in which the point neighbourhood is established. In the second step, connected voxels which are not empty are grouped to obtain grouped points based on proximity. The third step is a coplanar point segmentation based on both coherence and proximity, which was performed on each point group obtained in the second step. Finally, neighbouring coplanar point groups are merged into “co-surface” point groups based on the criteria of plane connection and intersection. This scheme enables an incremental retrieval and analysis of a large lidar data-set. Experimental results demonstrate the effectiveness of the segmentation algorithm in handling both airborne and terrestrial lidar data. It is anticipated that the incremental segmentation results will be useful for object modelling using lidar data. Numéro de notice : A2011-077 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00624.x Date de publication en ligne : 16/03/2011 En ligne : https://doi.org/10.1111/j.1477-9730.2011.00624.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30858
in Photogrammetric record > vol 26 n° 133 (March - May 2011) . - pp 32 - 57[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-2011011 RAB Revue Centre de documentation En réserve L003 Disponible A new solution to the relative orientation problem using only 3 points and the vertical direction / Mahzad Kalantari in Journal of Mathematical Imaging and Vision, vol 39 n° 3 (March 2011)
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Titre : A new solution to the relative orientation problem using only 3 points and the vertical direction Type de document : Article/Communication Auteurs : Mahzad Kalantari , Auteur ; Amir Hashemi, Auteur ; Franck Jung , Auteur ; Jean Pierre Guedon, Auteur Année de publication : 2011 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] coplanarité
[Termes IGN] extraction automatique
[Termes IGN] orientation relative
[Termes IGN] point de fuite
[Termes IGN] points homologues
[Termes IGN] verticaleRésumé : (auteur) This paper presents a new method to solve the relative pose between two images, using three pairs of homologous points and the knowledge of the vertical direction. The vertical direction can be determined in two ways: The first requires direct physical measurements such as the ones provided by an IMU (inertial measurement unit). The other uses the automatic extraction of the vanishing point corresponding to the vertical direction in an image. This knowledge of the vertical direction solves two unknowns among the three parameters of the relative rotation, so that only three homologous couples of points are requested to position a couple of images. Rewriting the coplanarity equations thus leads to a much simpler solution. The remaining unknowns resolution is performed by “hiding a variable” approach. The elements necessary to build a specific algebraic solver are given in this paper, allowing for a real-time implementation. The results on real and synthetic data show the efficiency of this method. Numéro de notice : A2011-608 Affiliation des auteurs : ENSG+Ext (1941-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10851-010-0234-2 Date de publication en ligne : 09/11/2010 En ligne : https://doi.org/10.1007/s10851-010-0234-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91706
in Journal of Mathematical Imaging and Vision > vol 39 n° 3 (March 2011)[article]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)PermalinkGéométriser la Terre / E. Busser in Tangente, hors série n° 40 (01/01/2011)PermalinkHow to achieve consistency for 3D city models / G. Groger in Geoinformatica, vol 15 n° 1 (January 2011)PermalinkIntroduction à l’astronomie de position / Jonathan Chenal (2011)PermalinkPermalinkPermalinkPostGIS pour les néophytes (2ème partie) : Métatables et types / Anonyme in Géomatique expert, n° 78 (01/01/2011)PermalinkPermalinkDes projections à la carte / F. Lavallou in Tangente, hors série n° 40 (01/01/2011)Permalink