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scientifique

Dépouillements

Aeolian beach sand transport monitored by terrestrial laser scanning / Roderik Lindenbergh in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 384 - 399 Titre : Aeolian beach sand transport monitored by terrestrial laser scanning Type de document : Article/Communication Auteurs : Roderik Lindenbergh, Auteur ; S. Soudarissanane, Auteur ; S. de Vries, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 384 - 399 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] érosion éolienne [Termes IGN] géomorphologie [Termes IGN] lasergrammétrie [Termes IGN] littoral [Termes IGN] Pays-Bas [Termes IGN] sable [Termes IGN] surveillance géologique [Termes IGN] transport éolien Résumé : (Auteur) Morphodynamic changes at sandy coasts, as are dominant in the Netherlands, are typically monitored at yearly intervals by means of airborne laser scanning. Meanwhile it is recognised that beach morphodynamics is not a regular process and is strongly correlated to meteorological conditions. A series of 25 terrestrial laser scans of a beach experiment is analysed, obtained during a time period of 88 hours, characterised by changing weather conditions including strong wind and rain. It is shown that after a conversion to a cylindrical grid, different deformation regimes can be identified and rates of elevation changes below 1 mm per hour can be detected. Simultaneously, an analysis of distances between targets through time demonstrates the sensitivity of the used measurement set-up to the harsh weather conditions. Numéro de notice : A2011-493 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00659.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00659.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31387 [article]

Investigation of UAV systems and flight modes for photogrammetric applications / Henri Eisenbeiss in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 400 - 421 Titre : Investigation of UAV systems and flight modes for photogrammetric applications Type de document : Article/Communication Auteurs : Henri Eisenbeiss, Auteur ; Martin Sauerbier, Auteur Année de publication : 2011 Article en page(s) : pp 400 - 421 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] acquisition d'images [Termes IGN] carte thématique [Termes IGN] drone [Termes IGN] fouille archéologique [Termes IGN] modélisation 3D [Termes IGN] orientation du capteur [Termes IGN] patrimoine culturel [Termes IGN] photogrammétrie numérique [Termes IGN] Suisse [Termes IGN] trajectoire (véhicule non spatial) Résumé : (Auteur) Unmanned aerial vehicle (UAV) photogrammetry has been used in a growing number of diverse applications across different scientific disciplines. Early applications of UAVs included cultural heritage and archaeology, mainly for the documentation and modelling of monuments, buildings and landscapes. In this paper, the focus is on the application of UAVs for documenting archaeological excavations. As excavating is a dynamic process and the objects to be acquired can change significantly within a few hours, UAVs can provide a suitable alternative to traditional measurement methods such as measuring tapes and tachymeters. Nevertheless, the image processing steps have to be automated, as a large number of resulting materials, usually sketches, maps, ortho-images and 3D models, need to be available quickly. In order to accelerate the processing workflow, an interface between the UAV ground control software and various photogrammetric software packages was developed at ETH Zurich, which allows for an efficient management and transfer of orientation, trajectory and sensor data for rapid project set up. Numéro de notice : A2011-494 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00657.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00657.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31388 [article]

Photogrammetric techniques for voxel-based flow velocity field measurement / Patrick Westfeld in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 422 - 438 Titre : Photogrammetric techniques for voxel-based flow velocity field measurement Type de document : Article/Communication Auteurs : Patrick Westfeld, Auteur ; Hans-Gerd Maas, Auteur Année de publication : 2011 Article en page(s) : pp 422 - 438 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] champ de vitesse [Termes IGN] cube [Termes IGN] dimension temporelle [Termes IGN] dynamique des fluides [Termes IGN] image multicapteur [Termes IGN] méthode des moindres carrés [Termes IGN] reconstruction 3D [Termes IGN] tomographie [Termes IGN] transformation affine [Termes IGN] voxel Résumé : (Auteur) The paper presents improved photogrammetric techniques for the determination of 3D flow velocity fields with the goal of optimising the performance, efficiency and flexibility of the method. This includes a multi-camera system configuration and calibration, as well as approaches for volumetric reconstruction. The result of the volumetric reconstruction process is a time-resolved, voxel-space representation of tracer particles marking a flow. Using a high-speed camera, a typical data-set consists of 1000 volumetric data-sets per second, each with 1000 x 1000 x 300 voxels. 3D tracking in the time-resolved voxel data is performed by 3D least squares tracking, determining 12 parameters of a 3D affine transformation between cuboids in successive voxel data-sets. Besides the cuboid translation, these parameters also include information on the shear tensor of each cuboid. The tomographic reconstruction methods and the cuboid tracking have been implemented and validated with both simulated and real data in an experimental set-up of a vortex ring in a water tank. Numéro de notice : A2011-495 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00656.x En ligne : https://doi.org/10.1111/j.1477-9730.2011.00656.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31389 [article]

Review of geometric and radiometric analyses of paintings / Fabio Remondino in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 439 - 461 Titre : Review of geometric and radiometric analyses of paintings Type de document : Article/Communication Auteurs : Fabio Remondino, Auteur ; Luigi Barazzetti, Auteur ; Marco Scaioni, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 439 - 461 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] capteur actif [Termes IGN] déformation d'image [Termes IGN] image multibande [Termes IGN] patrimoine culturel [Termes IGN] patrimoine mobilier [Termes IGN] peinture [Termes IGN] photogrammétrie terrestre [Termes IGN] qualité radiométrique (image) [Termes IGN] restitution [Termes IGN] surveillance [Termes IGN] télémétrie laser terrestre [Termes IGN] valeur radiométrique Résumé : (Auteur) This paper presents an overview of a number of diagnostic campaigns carried out to assess the conservation state of paintings. The specific characteristics required in cultural heritage applications have been investigated and are reported, where two main fields are considered: radiometric analyses using multispectral images and 3D surveying for geometric deformation analysis by means of photogrammetry and laser scanning. The activities described were accomplished in interdisciplinary teams, composed of photogrammetrists, art-historians, restorers and experts of non-destructive diagnostic techniques. Numéro de notice : A2011-496 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00664.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00664.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31390 [article]

Surveying and modelling the Main Spire of Milan Cathedral using multiple data sources / F. Fassi in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 462 - 487 Titre : Surveying and modelling the Main Spire of Milan Cathedral using multiple data sources Type de document : Article/Communication Auteurs : F. Fassi, Auteur ; Cristiana Achille, Auteur ; Luigi Fregonese, Auteur Année de publication : 2011 Article en page(s) : pp 462 - 487 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] cathédrale [Termes IGN] lever topométrique [Termes IGN] Milan [Termes IGN] modélisation 3D [Termes IGN] patrimoine immobilier [Termes IGN] surveillance d'ouvrage [Termes IGN] toit Résumé : (Auteur) This paper presents a possible way of surveying and modelling very complex architecture, integrating different instrumentation and modelling methods. In particular, it aims to draw attention to a possible measurement and data processing procedure allowing the rapid collection and post-processing of data in order to extract classical architectural products such as sections and profiles, and to build complete, accurate 3D models. The need is to structure a multiple data source procedure within a five-year project (still in progress) to survey and model the main spire of Milan Cathedral three-dimensionally. The spire is a very complex object and, for this reason, provides a really useful, challenging field test for new 3D survey technologies and, in particular, for integrating a variety of modelling methodologies. The paper describes survey workflow and processing steps, focusing on problems and justifying key choices. Numéro de notice : A2011-497 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00658.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00658.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31391 [article]

3D-sutra-interactive analysis tool for a Web atlas of scanned sutra inscriptions in China / N. Schmidt in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)  

Public [article]  inPhotogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 488 - 505 Titre : 3D-sutra-interactive analysis tool for a Web atlas of scanned sutra inscriptions in China Type de document : Article/Communication Auteurs : N. Schmidt, Auteur ; R. Schütze, Auteur ; F. Boochs, Auteur Année de publication : 2011 Article en page(s) : pp 488 - 505 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] atlas numérique [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] patrimoine culturel [Termes IGN] programme interactif [Termes IGN] reconstruction 3D [Termes IGN] Setchouan (Chine) [Termes IGN] site web [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Buddhist stone inscriptions of the 8th to 12th centuries ad are important cultural assets of China that need to be documented, analysed and interpreted archaeologically, art-historically and linguistically. On the one hand, such Buddhist stone inscriptions have to be conserved for future generations, but on the other hand, further possibilities for analysing the data could be achieved if the inscriptions were made accessible to a wider community, for instance, for understanding of the historical growth of Buddhism in China. In this paper, innovative techniques for the documentation of stone inscriptions located in the province of Sichuan, in the south-west of China, are demonstrated. The tasks to be performed include capturing the stone inscriptions by using high precision measuring techniques to generate copies of the original inscriptions, together with processing of the data enabling improvement in the legibility of characters and thus aiding the interpretation of the inscriptions. The concept and features of image processing as applied to the captured inscriptions are outlined. In order to present the outcome to as many people as possible and to allow individual interpretations of the results of the stone inscription reconstruction, their current interpretation and additional 2D/3D maps are published within an interactive web platform. Numéro de notice : A2011-498 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00660.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00660.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31392 [article]