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3D WebGIS : from visualization to analysis. An efficient browser-based 3D line-of-sight analysis / Michael Auer in ISPRS International journal of geo-information, vol 7 n° 7 (July 2018)  

Public [article]  inISPRS International journal of geo-information > vol 7 n° 7 (July 2018) Titre : 3D WebGIS : from visualization to analysis. An efficient browser-based 3D line-of-sight analysis Type de document : Article/Communication Auteurs : Michael Auer, Auteur ; Alexander Zipf, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] analyse spatiale [Termes IGN] base de données localisées 3D [Termes IGN] HTML [Termes IGN] ligne de visée [Termes IGN] optimisation (mathématiques) [Termes IGN] visualisation 3D [Termes IGN] webGL [Termes IGN] WebSIG Résumé : (Auteur) 3D WebGIS systems have been mentioned in the literature almost since the beginning of the graphical web era in the late 1990s. The potential use of 3D WebGIS is linked to a wide range of scientific and application domains, such as planning, controlling, tracking or simulation in crisis management, military mission planning, urban information systems, energy facilities or cultural heritage management, just to name a few. Nevertheless, many applications or research prototypes entitled as 3D WebGIS or similar are mainly about 3D visualization of GIS data or the visualization of analysis results, rather than about performing the 3D analysis itself online. This research paper aims to step forward into the direction of web-based 3D geospatial analysis. It describes how to overcome speed and memory restrictions in web-based data management by adapting optimization strategies, developed earlier for web-based 3D visualization. These are applied in a holistic way in the context of a fully 3D line-of-sight computation over several layers with split (tiled) and unsplit (static) data sources. Different optimization approaches are combined and evaluated to enable an efficient client side analysis and a real 3D WebGIS functionality using new web technologies such as HTML5 and WebGL. Numéro de notice : A2018-347 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi7070279 Date de publication en ligne : 21/07/2018 En ligne : https://doi.org/10.10.3390/ijgi7050187 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90572 [article]

Local curvature entropy-based 3D terrain representation using a comprehensive Quadtree / Giyu Chen in ISPRS Journal of photogrammetry and remote sensing, vol 139 (May 2018)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 139 (May 2018) . - pp 30 - 45 Titre : Local curvature entropy-based 3D terrain representation using a comprehensive Quadtree Type de document : Article/Communication Auteurs : Giyu Chen, Auteur ; Gang Liu, Auteur ; Xiaogang Ma, Auteur ; Gregoire Mariethoz, Auteur ; Zhenwen He, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 30 - 45 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] arbre quadratique [Termes IGN] entropie [Termes IGN] modèle numérique de terrain [Termes IGN] niveau de détail [Termes IGN] visualisation 3D Résumé : (Auteur) Large scale 3D digital terrain modeling is a crucial part of many real-time applications in geoinformatics. In recent years, the improved speed and precision in spatial data collection make the original terrain data more complex and bigger, which poses challenges for data management, visualization and analysis. In this work, we presented an effective and comprehensive 3D terrain representation based on local curvature entropy and a dynamic Quadtree. The Level-of-detail (LOD) models of significant terrain features were employed to generate hierarchical terrain surfaces. In order to reduce the radical changes of grid density between adjacent LODs, local entropy of terrain curvature was regarded as a measure of subdividing terrain grid cells. Then, an efficient approach was presented to eliminate the cracks among the different LODs by directly updating the Quadtree due to an edge-based structure proposed in this work. Furthermore, we utilized a threshold of local entropy stored in each parent node of this Quadtree to flexibly control the depth of the Quadtree and dynamically schedule large-scale LOD terrain. Several experiments were implemented to test the performance of the proposed method. The results demonstrate that our method can be applied to construct LOD 3D terrain models with good performance in terms of computational cost and the maintenance of terrain features. Our method has already been deployed in a geographic information system (GIS) for practical uses, and it is able to support the real-time dynamic scheduling of large scale terrain models more easily and efficiently. Numéro de notice : A2018-110 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2018.03.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2018.03.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89540 [article]

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3D visualization of trees based on a sphere-board model / Jiangfeng She in ISPRS International journal of geo-information, vol 7 n° 2 (February 2018)  

Public [article]  inISPRS International journal of geo-information > vol 7 n° 2 (February 2018) Titre : 3D visualization of trees based on a sphere-board model Type de document : Article/Communication Auteurs : Jiangfeng She, Auteur ; Xingchen Guo, Auteur ; Xin Tan, Auteur ; Jianlong Liu, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] arbre (flore) [Termes IGN] modèle de croissance végétale [Termes IGN] rendu réaliste [Termes IGN] sphère [Termes IGN] visualisation 3D [Vedettes matières IGN] Foresterie Résumé : (Auteur) Because of the smooth interaction of tree systems, the billboard and crossed-plane techniques of image-based rendering (IBR) have been used for tree visualization for many years. However, both the billboard-based tree model (BBTM) and the crossed-plane tree model (CPTM) have several notable limitations; for example, they give an impression of slicing when viewed from the top side, and they produce an unimpressive stereoscopic effect and insufficient lighted effects. In this study, a sphere-board-based tree model (SBTM) is proposed to eliminate these defects and to improve the final visual effects. Compared with the BBTM or CPTM, the proposed SBTM uses one or more sphere-like 3D geometric surfaces covered with a virtual texture, which can present more details about the foliage than can 2D planes, to represent the 3D outline of a tree crown. However, the profile edge presented by a continuous surface is overly smooth and regular, and when used to delineate the outline of a tree crown, it makes the tree appear very unrealistic. To overcome this shortcoming and achieve a more natural final visual effect of the tree model, an additional process is applied to the edge of the surface profile. In addition, the SBTM can better support lighted effects because of its cubic geometrical features. Interactive visualization effects for a single tree and a grove are presented in a case study of Sabina chinensis. The results show that the SBTM can achieve a better compromise between realism and performance than can the BBTM or CPTM. Numéro de notice : A2018-106 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi7020039 En ligne : https://doi.org/10.3390/ijgi7020045 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89532 [article]

3D immersive underground navigation [short paper] / Quoc-Dinh Nguyen (2018)    

Public Titre : 3D immersive underground navigation [short paper] Type de document : Article/Communication Auteurs : Quoc-Dinh Nguyen , Auteur ; Mathieu Brédif , Auteur ; Didier Richard , Auteur Editeur : Association of Geographic Information Laboratories in Europe AGILE Année de publication : 2018 Projets : 1-Pas de projet / Conférence : AGILE 2018, 21th International Conference on Geo-Information Science 12/06/2018 15/06/2018 Lund Suède Open Access Proceedings Importance : 4 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Français (fre) Descripteur : [Termes IGN] eau usée [Termes IGN] iTowns [Termes IGN] Paris (75) [Termes IGN] reconstruction 3D [Termes IGN] rendu réaliste [Termes IGN] réseau d'assainissement [Termes IGN] réseau technique souterrain [Termes IGN] visualisation 3D [Termes IGN] vue immersive [Vedettes matières IGN] Géovisualisation Résumé : (auteur) In this paper, we describe a system for visualizing and exploiting 3D digital data of the Parisian sewer system (PSS). PSS presents a difficult working environment because it is subject to a certain number of risks: toxic gases and waste, biological risks such as viruses and pathogenic bacteria contained in wastewater. Certain areas of PSS are damp, unhealthy, encumbered with waste. In order to improve the working conditions of the sewers and usage of the network in the context of the research for a reduction on exposures to health and safety risks, we developed such system aiming to do the visualization and exploitation of 3D PSS data. Our system allows sewer operators to gather data, information for observation, direct inspection, indirect monitoring and reporting to assess the condition of such sewer system. Numéro de notice : C2018-018 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : GEOMATIQUE/IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Date de publication en ligne : 20/06/2018 En ligne : https://agile-online.org/conference_paper/cds/agile_2018/shortpapers/51%20Short_ [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90476

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Colorisation of LiDAR point cloud / Mathieu Brédif (2018)

Public Titre : Colorisation of LiDAR point cloud Type de document : Article/Communication Auteurs : Mathieu Brédif , Auteur ; Aurélie Bugeau, Auteur ; Jean-François Aujol, Auteur ; Pierre Biasutti , Auteur Editeur : Philadelphie : Society for Industrial and Applied Mathematics SIAM Année de publication : 2018 Conférence : IS 2018, SIAM conference on imaging science 05/06/2018 08/06/2018 Bologne Italie Open Access Abstracts Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] couleur à l'écran [Termes IGN] données localisées 3D [Termes IGN] image optique [Termes IGN] semis de points Résumé : (auteur) Most recent mobile mapping systems (MMS) capture 3D lidar point cloud together with HD optical images. In this talk, we will present a method to add color information to each lidar point. First, each lidar point is projected onto each color image. By comparing the depth of a point in one image with the ones of its neighbors in the same image, a visibility coefficient is automatically estimated for each point in each point of view/image. It provides a confidence index to the color of the corresponding pixel. Each point is thus associated to a list of color candidates and their index of confidence. The final color for each point is computed from spatial regularization on the point cloud domain. Numéro de notice : C2018-096 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96509

Généralisation de représentations intermédiaires dans une carte topographique multi-échelle pour faciliter la navigation de l’utilisateur / Marion Dumont (2018)  

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Underground visualization: Web-app, virtual reality, ex situ and in situ augmented reality / Alexandre Devaux (2018) 

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Centrality-based hierarchy for street network generalization in multi-resolution maps / Wasim Shoman in Geocarto international, vol 32 n° 12 (December 2017)  

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SNCF Réseau : de l'acquisition 3D à la diffusion de la donnée / Mathieu Regul in XYZ, n° 153 (décembre 2017 - février 2018) 

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An effective spherical panoramic LoD model for a mobile street view service / Xianxiong Liu in Transactions in GIS, vol 21 n° 5 (October 2017)  

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The confirmed realities and myths about the benefits and costs of 3D Visualization and virtual reality in discrete event modeling and simulation: A descriptive meta-analysis of evidence from research and practice / Ikpe Justice Akpan in Computers & Industrial Engineering, vol 112 (October 2017)  

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Using NoSQL databases in the 3D cadastre domain / Nenad Višnjevac in Geodetski vestnik, vol 61 n° 3 (September - November 2017)  

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Dernières nouvelles de QGIS ... et d'autres / Vincent Picavet in Géomatique expert, n° 117 (juillet - août 2017)

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Domains of uncertainty visualization research: a visual summary approach / Jennifer Smith Mason in Cartography and Geographic Information Science, Vol 44 n° 4 (July 2017)  

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How users perceive transparency in the 3D visualization of cadastre : testing its usability in an online questionnaire / Chen Wang in Geoinformatica, vol 21 n° 3 (July - September 2017)  

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