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Aerial data acquisition for a digital railway / James Dunthorne in GIM international, vol 32 n° 4 (July - August 2018)  

Public [article]  inGIM international > vol 32 n° 4 (July - August 2018) . - pp 26 - 27 Titre : Aerial data acquisition for a digital railway Type de document : Article/Communication Auteurs : James Dunthorne, Auteur Année de publication : 2018 Article en page(s) : pp 26 - 27 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] acquisition de données [Termes IGN] chambre à moyen format [Termes IGN] image à ultra haute résolution [Termes IGN] image captée par drone [Termes IGN] logiciel de visualisation [Termes IGN] réseau ferroviaire [Termes IGN] Royaume-Uni Résumé : (auteur) One of the major challenges facing railway networks is preventing failures in railway tracks. Avoiding potential track malfunctions means inspecting thousands of miles of track, while avoiding risk to inspectors and traffic interference. One innovative inspection methodology is to build a ‘digital railway’ – an accurate and dynamic visualisation tool to identify actual and potential track damage. Relying on the highest-quality data acquisition, a digital railway helps those responsible to make better informed decisions while planning and prioritising rail development, maintenance, repairs and renewal projects. This article outlines the use of such a tool in a UK railway project. Numéro de notice : A2018-243 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.gim-international.com/content/article/aerial-data-acquisition-for-a- [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90303 [article]

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Digital elevation quality derived from medium-format digital cameras / Peter T. Y. Shih in Photogrammetric record, vol 28 n° 144 (December 2013 - February 2014)  

Public [article]  inPhotogrammetric record > vol 28 n° 144 (December 2013 - February 2014) . - pp 416 - 435 Titre : Digital elevation quality derived from medium-format digital cameras Type de document : Article/Communication Auteurs : Peter T. Y. Shih, Auteur ; J.Y. Wu, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 416 - 435 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] appariement automatique [Termes IGN] chambre à moyen format [Termes IGN] données lidar [Termes IGN] modèle numérique de surface [Termes IGN] qualité des données [Termes IGN] semis de points Résumé : (Auteur) Medium-format digital cameras are a useful tool in airborne lidar missions to produce digital ortho-images. This study investigates the quality of digital elevation models (DEMs) and digital surface models (DSMs) derived from such cameras. An image-matching strategy is used to produce height information from highly overlapping images and the quality of the derived height information is analysed using synchronous lidar point clouds as the reference data. The evaluation focused on various types of land cover and DEM generation methods. The RMSE between lidar and image-derived height information for two datasets was 0·054% and 0·027% of the flying height in flat, bare-earth areas, but studies with manually edited vegetated areas using stereo photogrammetry revealed high uncertainties, especially in steep terrain. Numéro de notice : A2013-631 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12039 Date de publication en ligne : 09/12/2013 En ligne : https://doi.org/10.1111/phor.12039 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32767 [article]

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Automatic photogrammetric solution / D. Yalon in Geoinformatics, vol 14 n° 8 (01/12/2011)

Public [article]  inGeoinformatics > vol 14 n° 8 (01/12/2011) . - pp 14 - 16 Titre : Automatic photogrammetric solution Type de document : Article/Communication Auteurs : D. Yalon, Auteur Année de publication : 2011 Article en page(s) : pp 14 - 16 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] acquisition d'images [Termes IGN] chambre à moyen format [Termes IGN] chambre à petit format [Termes IGN] Icaros Photogrammetric Suite [Termes IGN] logiciel de photogrammétrie Résumé : (Auteur) The use of small and medium format sensor for traditional photogrammetry can present a number of prominent challenges. For these formats, the relatively small image footprint usually leads to a large number of images needing to be processed. Traditionally this fact has limited the use of small and medium format sensors to simple projects of small and unchallenging areas. This paper will describe the use of the Icaros Photogrammetric Suite (IPS2.0 and IPS3.0) through a case study of an extremely difficult project, captured with a small format sensor. Numéro de notice : A2011-480 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31374 [article]

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Digital aerial cameras / Mathias Lemmens in GIM international, vol 25 n° 4 (April 2011)  

Public [article]  inGIM international > vol 25 n° 4 (April 2011) . - pp 35 - 41 Titre : Digital aerial cameras Type de document : Article/Communication Auteurs : Mathias Lemmens, Auteur Année de publication : 2011 Article en page(s) : pp 35 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] chambre à grand format [Termes IGN] chambre à moyen format [Termes IGN] instrument aéroporté Résumé : (Auteur) The growing need for geo-data everywhere is driving customers to demand shorter turnaround rates and higher levels of detail. These needs can be met by aerial imagery directly captured in digital format onboard an aircraft. In tandem with the new product survey on Digital Aerial Cameras (see our website), the author here gives an overview of new developments. Numéro de notice : A2011-113 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : http://www.gim-international.com/content/article/digital-aerial-cameras-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30893 [article]

Commission 1: Performance of medium format digital airborne cameras / Görres Grenzdorffer (2010) 

Public in EuroSDR-Project / Jantien E. Stoter (2010)     Titre : Commission 1: Performance of medium format digital airborne cameras Type de document : Chapitre/Contribution Auteurs : Görres Grenzdorffer, Auteur Editeur : Dublin : European Spatial Data Research EuroSDR Année de publication : 2010 Collection : EuroSDR official publication, ISSN 0257-0505 num. 58 Importance : pp 233 - 266 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] chambre à moyen format [Termes IGN] étalonnage géométrique [Termes IGN] étalonnage radiométrique [Termes IGN] instrument aéroporté Résumé : (auteur) The report describes digital medium format cameras as professional systems, used for airborne mapping applications. In the last two years, the term "medium format" does not stand for a single camera, equipped with a CCD-chip fitting in the former 6 * 6 cm medium format camera bodies anymore. The newly introduced "medium format" systems from Microsoft and Z/I generate images of nearly the same footprint as the first generation large format cameras. Also multi head medium format systems provide the same footprint of a large format camera system. Therefore a new category has to be introduced: the intermediate systems. Nevertheless the key advantages of medium format systems, compared to large format systems is a lower price and a big plus in terms of flexibility due to low weight and interchangeable lenses. Due to their flexibility medium format system are used for a wide range of applications. Medium format systems are most successful for local projects as well as for oblique imagery. The largest proportion of medium format cameras are used as a sub-system of integrated airborne data acquisition platforms consisting of laser scanners. Nowadays digital medium format camera systems are mature airborne systems with high reliability. With the increasing demand of “near-online” digital aerial data these systems will become even more popular in the future. Note de contenu : 1. INTRODUCTION 1.1 Objectives of this report 2. CATEGORIZATION OF DIGITAL MEDIUM FORMAT CAMERA SYSTEMS 2.1 Developments of medium format cameras in the last two years 3. COMPARISON OF MEDIUM FORMAT CAMERAS TO LARGE FORMAT CAMERAS 3.1 Geometric Potential 3.2 Minimum GSD of medium format cameras 3.3 Image motion 4. GEOMETRIC AND RADIOMETRIC CALIBRATION 4.1 Geometric calibration 4.2 Geometric performance of medium format - Results of the DGPF-Testbed 4.3 Radiometric accuracy and calibration 5. STANDARDIZATION 6. APPLICATION DOMAINS 7. MARKET SURVEY OF MEDIUM FORMAT CAMERA SYSTEMS 7.1 RMK-D 7.2 Trimble / Applanix DSS ? 439 7.3 Trimble AIC 7.4 DigiCAM- (H39 / H50 / H60) 7.5 DiMAC - (Digital Modular Aerial Camera) 7.6 Leicas RCD medium format cameras 7.7 UltraCamLp 8.1 CURRENT TRENDS AND OUTLOOK FOR MEDIUM FORMAT CAMERA SYSTEMS 8. Rapid processing . 8.2 Multi head systems 8.3 Forward-motion compensation (FMC) 8.4 Oblique Images 8.5 Increase in image size 9. ACKNOWLEDGMENTS 10. REFERENCES Numéro de notice : H2010-004 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Chapître / contribution Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86302

Documents numériques

en open access H2010-004_Commission 1: Performance of medium format digital airborne cameras Adobe Acrobat PDF

EuroSDR-Project / Jantien E. Stoter (2010)    

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A multi-sensor technology for transmission line surveys: Lidar and medium-format digital imaging / F. Artes in Geoinformatics, vol 8 n° 4 (01/06/2005)

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Training for digital aerial survey and mapping: the potential and training aspects of medium format digital camera / R. Graham in GeoEurope, vol 10 n° 11 (01/11/2001)

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