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Terrestrial laser scanning as a key element in the integrated monitoring of tidal influences on a twin-tube concrete tunnel / Timothy Nuttens in Photogrammetric record, vol 29 n° 148 (December 2014 - February 2015)  

Public [article]  inPhotogrammetric record > vol 29 n° 148 (December 2014 - February 2015) . - pp 402–416 Titre : Terrestrial laser scanning as a key element in the integrated monitoring of tidal influences on a twin-tube concrete tunnel Type de document : Article/Communication Auteurs : Timothy Nuttens, Auteur ; Cornelis Stal, Auteur ; Hans de Backer, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 402–416 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] Anvers (Flandre) [Termes IGN] marée océanique [Termes IGN] surveillance d'ouvrage [Termes IGN] télémétrie laser terrestre [Termes IGN] tunnel Résumé : (Auteur) In 2012, for the first time in Belgium, integrated monitoring was carried out to assess the deformations of a twin-tube tunnel below the River Scheldt in Antwerp under the influence of estuarine tides. Levelling measurements during a tide cycle showed a variation in the height of levelling bolts of up to 10 mm between low and high tide. Simultaneous strain-gauge measurements also showed a significant difference in strains. A deformation of the tunnel section during each twice-daily tide cycle, resulting in an eccentric “egg” or “pumpkin” shape, could hold large risks for the strength and durability of the tunnel structure. However, laser scanning results showed that there were no significant deformations of the tunnel's shape during the tide cycle. The laser scanning measurements resulted in a more thorough view of the deformation pattern which was much needed and improved the long-term risk assessment of the tunnel. Numéro de notice : A2014-647 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12080 Date de publication en ligne : 16/12/2014 En ligne : https://doi.org/10.1111/phor.12080 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75093 [article]

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Digital representation of historical globes : methods to make 3D and pseudo-3D models of sixteenth century Mercator globes / Cornelis Stal in Cartographic journal (the), vol 49 n° 2 (May 2012)  

Public [article]  inCartographic journal (the) > vol 49 n° 2 (May 2012) . - pp 107 - 117 Titre : Digital representation of historical globes : methods to make 3D and pseudo-3D models of sixteenth century Mercator globes Type de document : Article/Communication Auteurs : Cornelis Stal, Auteur ; De Wulf, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 107 - 117 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] acquisition d'images [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] géoréférencement [Termes IGN] globe [Termes IGN] image terrestre [Termes IGN] lasergrammétrie [Termes IGN] objet géographique 3D [Termes IGN] patrimoine culturel [Termes IGN] reconstruction d'objet [Termes IGN] texturage [Termes IGN] traitement d'image Résumé : (Auteur) In this paper, the construction of digital representations of a terrestrial and celestial globe will be discussed. Virtual digital (3D) models play an important role in recent research and publications on cultural heritage. The globes discussed in this paper were made by Gerardus Mercator (1512-1594) in 1541 and 1551. Four techniques for the digital representation are discussed and analysed, all using high-resolution photographs of the globes. These photographs were taken under studio conditions in order to get equal lighting and to avoid unwanted light spots. These lighting conditions are important, since the globes have a highly reflective varnish covering. Processing these images using structure from motion, georeferencing of separate scenes and the combination of the photographs with terrestrial laser scanning data results in true 3D representations of the globes. Besides, pseudo-3D models of these globes were generated using dynamic imaging, which is an extensively used technique for visualisations over the Internet. The four techniques and the consequent results are compared on geometric and radiometric quality, with a special focus on their usefulness for distribution and visualisation during an exhibition in honour of the five hundredth birthday of Gerardus Mercator. Numéro de notice : A2012-275 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277412Y.0000000002 Date de publication en ligne : 22/11/2013 En ligne : https://doi.org/10.1179/1743277412Y.0000000002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31721 [article]

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