9-Publications IGN 2015
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contenu dans ICC'15, 27th International Cartographic Conference, Rio de Janeiro, Brazil / International cartographic association = association cartographique internationale (2015)
Titre : A system to apply cartographic practices on 3D renderings Type de document : Article/Communication Auteurs : Mickaël Brasebin , Auteur ; Elodie Buard , Auteur ; Sidonie Christophe , Auteur ; Florian Pelloie, Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2015 Conférence : ICC 2015, 27th International Cartographic Conference, 16th General Assembly 23/08/2015 28/08/2015 Rio de Janeiro Brésil open access proceedings Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données localisées 3D
[Termes IGN] rendu réaliste
[Termes IGN] style cartographique
[Termes IGN] symbole graphique 3D
[Termes IGN] variable visuelle
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) 3D renderings are used and abused, notably for public consultation concerning urban projects. As 3D semiotics is not clearly defined (Häberling, 2008), the impact of graphic parameters (e.g. material color or light) of such renderings on public understanding and perception is not controlled. On the contrary, in cartographic domain, good practices based on a set of visual variables have been recommended by (Bertin, 1982) in order to ensure understandable cartographic messages. The aim of our work is to use and revisit these practices to apply them on 3D renderings and thus to create 3D semiotics. In this contribution, we introduce an original generic method to assess styles of 3D renderings. The first step is to define 3D styles. We analyse graphic parameters of each geographic features composing the rendering (e.g. sidewalk, tree trunk, house roof or door). Four categories of styles are highlighted combining two pairs of characteristics, level of details and level of photorealism: detailed representation vs non-detailed representation and photorealistic representation (PR) vs non-photorealistic representation (NPR). In order to illustrate these four categories, a collection of 3D renderings, from urban projects focused on one building, has been set up. Each rendering can then be systematically described and categorized into theses categories, pointing out the graphic parameters that participate to the categories. As an example, it turns out that window transparency and absence of edging increase photorealism perception. In a second step, we want to navigate automatically between the styles belonging to these categories, for a same rendering. For that, transformations between renderings are described into elementary modifications of graphic parameters and traduced into visual variables in using the matrix proposed in (Jobst, 2008). For example, for a tested transformation between NP to NPR styles, hue, grain and value visual variables are modified. In future work, the undertaken method could be improved in extracting automatically necessary graphic parameters. In the long term, we aim to create methods to automatically change styles (3D or even 2D) according to the context of users and purposes. For that, we could apply and study other types of cartographic practices, not only based on visual variables, but concerning: identification of thematic relationships between geographic features in the rendering, rules to preserve readability of neighbour features using color, shape or style contrasts or adding thematic qualitative or quantitative informations. As for the users, our objective is to provide them tools to create 3D renderings with a specific style and relevant to their objectives. Numéro de notice : C2015-023 Affiliation des auteurs : LASTIG COGIT (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2015/papers/31/index.html Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83161 Documents numériques
en open access
A system to apply cartographic practices ... - pdf auteurMS word document
Titre : Distributed dimensonality-based rendering of lidar point clouds Type de document : Article/Communication Auteurs : Mathieu Brédif , Auteur ; Bruno Vallet , Auteur ; Benjamin Ferrand, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2015 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 40-3/W3 Conférence : ISPRS 2015, Geospatial Week : Laserscanning, ISSDQ, CMRT, ISA, GeoVIS, GeoBigData 28/09/2015 03/10/2015 La Grande Motte France ISPRS OA Archives Importance : pp 559 - 564 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] analyse en composantes principales
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] semis de points
[Termes IGN] visualisation 2DRésumé : (auteur) Mobile Mapping Systems (MMS) are now commonly acquiring lidar scans of urban environments for an increasing number of applications such as 3D reconstruction and mapping, urban planning, urban furniture monitoring, practicability assessment for persons with reduced mobility (PRM)... MMS acquisitions are usually huge enough to incur a usability bottleneck for the increasing number of non-expert user that are not trained to process and visualize these huge datasets through specific softwares. A vast majority of their current need is for a simple 2D visualization that is both legible on screen and printable on a static 2D medium, while still conveying the understanding of the 3D scene and minimizing the disturbance of the lidar acquisition geometry (such as lidar shadows). The users that motivated this research are, by law, bound to precisely georeference underground networks for which they currently have schematics with no or poor absolute georeferencing. A solution that may fit their needs is thus a 2D visualization of the MMS dataset that they could easily interpret and on which they could accurately match features with their user datasets they would like to georeference. Our main contribution is two-fold. First, we propose a 3D point cloud stylization for 2D static visualization that leverages a Principal Component Analysis (PCA)-like local geometry analysis. By skipping the usual and error-prone estimation of a ground elevation, this rendering is thus robust to non-flat areas and has no hard-to-tune parameters such as height thresholds. Second, we implemented the corresponding rendering pipeline so that it can scale up to arbitrary large datasets by leveraging the Spark framework and its Resilient Distributed Dataset (RDD) and Dataframe abstractions. Numéro de notice : C2015-004 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XL-3-W3-559-2015 Date de publication en ligne : 19/08/2015 En ligne : http://dx.doi.org/10.5194/isprsarchives-XL-3-W3-559-2015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80294
contenu dans Proceedings of the 9th Workshop on Geographic Information Retrieval, GIR'2015 / Ross S. Purves (2015)
Titre : TEXTOMAP : determining geographical window for texts Type de document : Article/Communication Auteurs : Geoffrey Brun , Auteur ; Catherine Dominguès , Auteur ; Marie-Dominique Van Damme , Auteur Editeur : New York [Etats-Unis] : Association for computing machinery ACM Année de publication : 2015 Conférence : GIR 2015, 9th Workshop on Geographic Information Retrieval 26/11/2015 27/11/2015 Paris France Proceedings ACM Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] exploration de texte
[Termes IGN] toponyme
[Termes IGN] traitement du langage naturelRésumé : (auteur) In newspapers or scholar manuals, numerous texts are accompanied by maps. In these map/text couples, maps give a spatial portrayal of the text issues, thus they make the spatial issues easier to understand. TEXTOMAP aims to design the geographical window of the text, based on the notion of important toponyms according to text issues. The important toponym selection is based on indicators which may be spatial, linguistic or semantic. Examples of geographical window calculation are shown and compared with the corresponding CLAVIN geographical focus. The work is in progress and perspectives are offered. Note de contenu : Paris France.. Numéro de notice : C2015-013 Affiliation des auteurs : LASTIG COGIT (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1145/2837689.2837703 Date de publication en ligne : 26/11/2015 En ligne : http://dx.doi.org/10.1145/2837689.2837703 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83289
Titre : Implementation of the ETRS89 in Europe: Current Status and Challenges Type de document : Article/Communication Auteurs : Carine Bruyninx, Auteur ; Zuheir Altamimi , Auteur ; Elmar Brockmann, Auteur ; Alessandro Caporali, Auteur ; Rolf Dach, Auteur ; Jan Douša, Auteur ; Rui Fernandes, Auteur ; et al., Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2015 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 146 Conférence : REFAG 2014, Reference Frames for Applications in Geosciences (IAG 2014 - Commission 1 symposium) 13/10/2014 17/10/2014 Kirchberg Grand Duché du Luxembourg Proceedings Springer Importance : pp 135 - 145 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] champ de vitesse
[Termes IGN] densification géodésique
[Termes IGN] European Terrestrial Reference System 1989
[Termes IGN] INSPIRE
[Termes IGN] réseau permanent EUREFRésumé : (auteur) The EUREF (Reference Frame Sub-Commission for Europe) Permanent GNSS Network (EPN) serves as the backbone for the realization of, and access to, the European Terrestrial Reference System (ETRS89). The cumulative site positions and velocities for the EPN stations are used for national ETRS89 densifications and geo-information applications. EUREF has developed specific guidelines through which European countries ask validation of their national ETRS89 densification campaigns. Today, the majority of the European countries has passed this process and a large part of European National Mapping and Cartographic Agencies have officially adopted ETRS89. In addition, ETRS89 plays a fundamental role in INSPIRE (Infrastructure for Spatial Information in the European Community).
In the meantime, some geographical zones are experiencing considerable deformation, degrading the lifetime of their national ETRS89 realizations. In order to derive a cross-boundary European velocity model that can be applied by different countries on top of their validated ETRS89 realization (while keeping consistency with their neighboring countries) the EUREF Technical Working Group has set up two initiatives: the EPN densification project and the EUREF Working Group on Deformation Models.Numéro de notice : C2014-022 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/1345_2015_130 En ligne : https://doi.org/10.1007/1345_2015_130 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90681
Titre : 3D octree based watertight mesh generation from ubiquitous data Type de document : Article/Communication Auteurs : Laurent Caraffa , Auteur ; Mathieu Brédif , Auteur ; Bruno Vallet , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2015 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 40-3/W3 Conférence : ISPRS 2015, Geospatial Week : Laserscanning, ISSDQ, CMRT, ISA, GeoVIS, GeoBigData 28/09/2015 03/10/2015 La Grande Motte France ISPRS OA Archives Importance : pp 613 - 617 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] algorithme Graph-Cut
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] maillage par triangles
[Termes IGN] octree
[Termes IGN] reconstruction d'objet
[Termes IGN] segmentation binaireRésumé : (auteur) Despite of the popularity of Delauney structure for mesh generation, octree based approaches remain an interesting solution for a first step surface reconstruction. In this paper, we propose a generic framework for a octree cell based mesh generation. Its input is a set of Lidar-based 3D measurements or other inputs which are formulated as a set of mass functions that characterize the level of confidence on the occupancy of each octree’s leaf. The output is a binary segmentation of the space between occupied and empty areas by taking into account the uncertainty of data. To this end, the problem is then reduced to a global energy optimization framework efficiently optimized with a min-cut approach. We use the approach for producing a large scale surface reconstruction algorithm by merging data from ubiquitous sources like airborne, terrestrial Lidar data, occupancy map and extra cues. Once the surface is computed, a solution is proposed for texturing the mesh. Numéro de notice : C2015-005 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE/MATHEMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XL-3-W3-613-2015 Date de publication en ligne : 19/08/2015 En ligne : http://dx.doi.org/10.5194/isprsarchives-XL-3-W3-613-2015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80295 Contribution of textural information from TerraSAR-X image for forest mapping / Cécile Cazals (2015)PermalinkPermalinkAn aggregated graph to qualify historical spatial networks using temporal patterns detection / Benoit Costes (2015)PermalinkPermalinkPermalinkAdding intermediate representations in a multi-scale map to enable a smooth zooming / Marion Dumont (2015)PermalinkPermalinkPublic authorities support for a Large Scale Data Infrastructure for Mobility (LaSDIM) / Alain Dupéret (2015)PermalinkTropical forest structure characterization using airborne lidar data: an individual tree level approach / António Ferraz (dec 2015)PermalinkKite-borne photogrammetry for decimetric 3D mapping of several square kilometres areas / Denis Feurer (2015)PermalinkAssessment of the relevance of information derived from the unmixing of polarimetric radar images / Sébastien Giordano (2015)PermalinkA framework to formalize multi-scales land-use generalization in the ScaleMaster 2.0 / Jean-François Girres (2015)PermalinkPermalinkPermalinkRetrieving the stand age from a retrospective detection of multinannual forest changes using Landsat data. Application on the heavily managed maritime pine forest in Southwestern France from a 30-year Landsat time-series (1984–2014) / Dominique Guyon (2015)PermalinkPermalinkDetection of potential updates of authoritative spatial databases by fusion of Volunteered Geographical Information from different sources / Stefan Ivanovic (2015)PermalinkExtraction of optimal spectral bands using hierarchical band merging out of hyperspectral data / Arnaud Le Bris (2015)PermalinkA Random Forest class memberships based wrapper band selection criterion : application to hyperspectral / Arnaud Le Bris (2015)PermalinkHomogeneous geovisualization of coastal areas from heterogeneous spatio-temporal data / Antoine Masse (2015)Permalink