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The variants of an LOD of a 3D building model and their influence on spatial analyses / Filip Biljecki in ISPRS Journal of photogrammetry and remote sensing, vol 116 (June 2016)
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Titre : The variants of an LOD of a 3D building model and their influence on spatial analyses Type de document : Article/Communication Auteurs : Filip Biljecki, Auteur ; Hugo Ledoux, Auteur ; Jantien E. Stoter, Auteur ; M. George Vosselman, Auteur Année de publication : 2016 Article en page(s) : pp 42 – 54 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse spatiale
[Termes IGN] CityGML
[Termes IGN] cohérence géométrique
[Termes IGN] méthode de Monte-Carlo
[Termes IGN] niveau de détail
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] SIG 3DRésumé : (auteur) The level of detail (LOD) of a 3D city model indicates the model’s grade and usability. However, there exist multiple valid variants of each LOD. As a consequence, the LOD concept is inconclusive as an instruction for the acquisition of 3D city models. For instance, the top surface of an LOD1 block model may be modelled at the eaves of a building or at its ridge height. Such variants, which we term geometric references, are often overlooked and are usually not documented in the metadata. Furthermore, the influence of a particular geometric reference on the performance of a spatial analysis is not known.
In response to this research gap, we investigate a variety of LOD1 and LOD2 geometric references that are commonly employed, and perform numerical experiments to investigate their relative difference when used as input for different spatial analyses. We consider three use cases (estimation of the area of the building envelope, building volume, and shadows cast by buildings), and compute the deviations in a Monte Carlo simulation.
The experiments, carried out with procedurally generated models, indicate that two 3D models representing the same building at the same LOD, but modelled according to different geometric references, may yield substantially different results when used in a spatial analysis. The outcome of our experiments also suggests that the geometric reference may have a bigger influence than the LOD, since an LOD1 with a specific geometric reference may yield a more accurate result than when using LOD2 models.Numéro de notice : A2016-577 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2016.03.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2016.03.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81709
in ISPRS Journal of photogrammetry and remote sensing > vol 116 (June 2016) . - pp 42 – 54[article]There's an app for that : using a smartphone for GNSS ionospheric data collection / Andrew Kennedy in GPS world, vol 27 n° 6 (June 2016)
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Titre : There's an app for that : using a smartphone for GNSS ionospheric data collection Type de document : Article/Communication Auteurs : Andrew Kennedy, Auteur ; Ryan Kingsbury, Auteur ; Anthea Coster, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 58 - 65 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] acquisition de données
[Termes IGN] Androïd
[Termes IGN] application informatique
[Termes IGN] ionosphère
[Termes IGN] récepteur GNSS
[Termes IGN] téléphone intelligent
[Termes IGN] teneur totale en électronsRésumé : (éditeur) [...] In this month’s column, we take a look at the use of a smartphone app to collect GNSS ionospheric data. Why would you want to do that? In the experience of the developers of the app, GNSS receivers are often characterized by a complex, proprietary data interface that differs for each manufacturer. In practice, this leads to significant investments in understanding interfaces and software tools. Human operators must familiarize themselves with the commands used to configure each receiver as well as with proprietary graphical user interfaces and tools specific to each receiver. The authors’ app-centric approach provides a software framework and output format that remain the same for different receivers. Receiver-specific commands are configurable within the app, so users can easily attach new receivers while reusing the existing infrastructures for data collection and processing. And smartphones have more than enough power and connectivity to do the job and can be easily moved from site to site. The smartphone as a handheld device to help scientists study the ionosphere? Probably not even Clive Sinclair foresaw that. Numéro de notice : A2016-333 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://gpsworld.com/innovation-theres-an-app-for-that/ Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80984
in GPS world > vol 27 n° 6 (June 2016) . - pp 58 - 65[article]Toward a generalizable image representation for large-scale change detection : application to generic damage analysis / Lionel Gueguen in IEEE Transactions on geoscience and remote sensing, vol 54 n° 6 (June 2016)
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Titre : Toward a generalizable image representation for large-scale change detection : application to generic damage analysis Type de document : Article/Communication Auteurs : Lionel Gueguen, Auteur ; Raffay Hamid, Auteur Année de publication : 2016 Article en page(s) : pp 3378 - 3387 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse combinatoire (maths)
[Termes IGN] analyse spatiale
[Termes IGN] codage
[Termes IGN] détection automatique
[Termes IGN] géovisualisation
[Termes IGN] image à haute résolution
[Termes IGN] image multicapteurRésumé : (Auteur) Each year, multiple catastrophic events impact vulnerable populations around the planet. Assessing the damage caused by these events in a timely and accurate manner is crucial for efficient execution of relief efforts to help the victims of these calamities. Given the low accessibility of the damaged areas, high-resolution optical satellite imagery has emerged as a valuable source of information to quickly asses the extent of damage by manually analyzing the pre- and postevent imagery of the region. To make this analysis more efficient, multiple learning techniques using a variety of image representations have been proposed. However, most of these representations are prone to variabilities in capture angle, sun location, and seasonal variations. To evaluate these representations in the context of damage detection, we present a benchmark of 86 pre- and postevent image pairs with respective reference data derived from United Nation Operational Satellite Applications Programme (UNOSAT) assessment maps, spanning a total area of 4665 km2 from 11 different locations around the world. The technical contribution of our work is a novel image representation based on shape distributions of image patches encoded with locality-constrained linear coding. We empirically demonstrate that our proposed representation provides an improvement of at least 5%, in equal error rate, over alternate approaches. Finally, we present a thorough robustness analysis of the considered representational schemes, with respect to capture-angle variabilities and multiple sensor combinations. Numéro de notice : A2016-852 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2016.2516402 En ligne : https://doi.org/10.1109/TGRS.2016.2516402 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82986
in IEEE Transactions on geoscience and remote sensing > vol 54 n° 6 (June 2016) . - pp 3378 - 3387[article]Usability evaluation of centered time cartograms / Rehmat Ullah in Open geosciences, vol 8 n° 1 (January - July 2016)
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Titre : Usability evaluation of centered time cartograms Type de document : Article/Communication Auteurs : Rehmat Ullah, Auteur ; Eskedar Zelalem Mengistu, Auteur ; Corné P.J.M. Van Elzakker, Auteur ; Menno-Jan Kraak, Auteur Année de publication : 2016 Article en page(s) : pp 337 - 359 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] cartogramme
[Termes IGN] convivialité
[Termes IGN] oculométrie
[Termes IGN] Pays-Bas
[Termes IGN] réseau ferroviaire
[Termes IGN] temps
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) A time cartogram visualizes travelling-times between locations. It replaces the geographic distance by time distance and distorts the underlyingmap accordingly. By distorting themap, time cartogramsmay give a more intuitive and clear picture of travelling-times. The distortion of the map, however, can make time cartograms harder to recognize and use. Although cartograms are becoming widespread in use, very little is known about their usability. This study focuses on the usability of centered time cartograms: time cartograms that visualize travellingtimes from a fixed starting location to other destinations in a region. We created several centered time cartograms to answer spatio-temporal questions related to the Dutch railway network. Two experiments were performed: a laboratory test and an online survey. In the laboratory test, we used eye-tracking, thinking aloud, and video-recording to compare four different designs of centered time cartograms to find out which one (or combination) of these performs better in answering spatiotemporal questions and thus, to establish a favorable design strategy for these cartograms. In the online survey, centered time cartograms were evaluated against a geographic and schematic map for accuracy, response time, and preference. The first experiment suggested that among various designs, the centered time cartogram with emphasized railroads is the most preferred design and the centered time cartogram without railroads is the least preferred. The second experiment indicated that overall, centered time cartograms perform better than the two other solutions in performing spatio-temporal tasks, particularly when the task has a dominant time-related component. Numéro de notice : A2016--069 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1515/geo-2016-0035 En ligne : https://doi.org/10.1515/geo-2016-0035 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84415
in Open geosciences > vol 8 n° 1 (January - July 2016) . - pp 337 - 359[article]Validation, suivi et mise en application du logiciel pour Android TopoSuite / N. Kurth in Géomatique suisse, vol 114 n° 6 (juin 2016)
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Titre : Validation, suivi et mise en application du logiciel pour Android TopoSuite Type de document : Article/Communication Auteurs : N. Kurth, Auteur Année de publication : 2016 Article en page(s) : pp 220 - 223 Note générale : Bibliographie Langues : Français (fre) Allemand (ger) Italien (ita) Descripteur : [Vedettes matières IGN] Topographie moderne
[Termes IGN] Androïd
[Termes IGN] logiciel de topométrie
[Termes IGN] logiciel libreRésumé : (Auteur) Le logiciel pour Android TopoSuite est un programme de calcul qui est mis à disposition gratuitement, commissionné par la CRAG (Commission paritaire Romande d'Apprentissage de Géomaticien(ne)s). Il est destiné à tous les praticiens, du métier de la géomatique depuis les apprentis géomaticien(ne)s jusqu'aux technicien(ne)s et ingénieur(e)s en géomatique. Il permet de faire toutes sortes de calculs tels que orientation à la station, station libre,levé et cheminement orthogonaux, intersection de droite et/ou cercle, résolution de triangles ainsi que de courbes circulaires, calcul de surfaces, déplacement de limite avec surface imposée, etc... Une aide à l'utilisation, disponible en pdf sur internet ou directement depuis l'application, permet la prise en main rapide et efficace du logiciel. Numéro de notice : A2016-659 Affiliation des auteurs : non IGN Thématique : INFORMATIQUE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81875
in Géomatique suisse > vol 114 n° 6 (juin 2016) . - pp 220 - 223[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 136-2016061 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkFrom consumer to pro / Monica Miller Rodgers in GEO: Geoconnexion international, vol 15 n° 5 (May 2016)
PermalinkLe géoportail de la confédération: 3D Viewer et des 3D services / Cédric Métraux in Géomatique suisse, vol 114 n° 5 (mai 2016)
PermalinkHybrid terrain rendering based on the external edge primitive / E.G. Paredes in International journal of geographical information science IJGIS, vol 30 n° 5-6 (May - June 2016)
PermalinkOnline interactive thematic mapping: Applications and techniques for socio-economic research / Duncan A. Smith in Computers, Environment and Urban Systems, vol 57 (May 2016)
PermalinkProjection Wizard – An online map projection selection tool / Bojan Šavrič in Cartographic journal (the), Vol 53 n° 2 (May 2016)
PermalinkSupporting polio eradication with Pléiades satellite imagery : reaching every household in Nigeria / Frédérique Coumans in GIM international, vol 30 n° 5 (May 2016)
PermalinkPermalinkAdvanced methods for the estimation of an unknown projection from a map / Tomáš Bayer in Geoinformatica, vol 20 n° 2 (April - June 2016)
PermalinkAllier analyse géographique et expertise locale dans un SIG pour une stratégie territoriale de sécurité routière / Eliane Propeck-Zimmermann in Revue internationale de géomatique, vol 26 n° 2 (avril - juin 2016)
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