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Hybrid georeferencing of images and LiDAR data for UAV-based point cloud collection at millimetre accuracy / Norbert Haala in ISPRS Open Journal of Photogrammetry and Remote Sensing, vol 4 (April 2022)  

Public [article]  inISPRS Open Journal of Photogrammetry and Remote Sensing > vol 4 (April 2022) . - n° 100014 Titre : Hybrid georeferencing of images and LiDAR data for UAV-based point cloud collection at millimetre accuracy Type de document : Article/Communication Auteurs : Norbert Haala, Auteur ; Michael Kölle, Auteur ; Michael Cramer, Auteur ; et al., Auteur Année de publication : 2022 Article en page(s) : n° 100014 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation automatisée [Termes IGN] appariement d'images [Termes IGN] collecte de données [Termes IGN] compensation par faisceaux [Termes IGN] données lidar [Termes IGN] géoréférencement direct [Termes IGN] image captée par drone [Termes IGN] orthoimage [Termes IGN] précision millimétrique [Termes IGN] semis de points [Termes IGN] zone d'intérêt Résumé : (auteur) During the last two decades, UAV emerged as standard platform for photogrammetric data collection. Main motivation in that early phase was the cost effective airborne image collection at areas of limited size. This was already feasible by rather simple payloads like an off-the-shelf, compact camera and a navigation-grade GNSS sensor. Meanwhile, dedicated sensor systems enable applications that have not been feasible in the past. One example is the airborne collection of dense 3D point clouds at millimetre accuracies, which will be discussed in our paper. For this purpose, we collect both LiDAR and image data from a joint UAV platform and apply a so-called hybrid georeferencing. This process integrates photogrammetric bundle block adjustment with direct georeferencing of LiDAR point clouds. By these means georeferencing accuracy is improved for the LiDAR point cloud by an order of magnitude. We demonstrate the feasibility of our approach in the context of a project, which aims on monitoring of subsidence of about 10 mm/year. The respective area of interest is defined by a ship lock and its vicinity of mixed use. In that area, multiple UAV flights were captured and evaluated for a period of three years. As our main contribution, we demonstrate that 3D point accuracies at sub-centimetre level can be achieved. This is realized by joint orientation of laser scans and images in a hybrid adjustment framework, which enables accuracies corresponding to the GSD of the captured imagery. Numéro de notice : A2022-236 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1016/j.ophoto.2022.100014Get rights and content Date de publication en ligne : 16/03/2022 En ligne : https://doi.org/10.1016/j.ophoto.2022.100014Get rights and content Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100146 [article]

On the use of RPAS in national mapping : The EuroSDR point of view / Michael Cramer (2013)  

Public Titre : On the use of RPAS in national mapping : The EuroSDR point of view Type de document : Article/Communication Auteurs : Michael Cramer, Auteur ; Stéphane Bovet, Auteur ; Manfred Gültlinger, Auteur ; Eija Honkavaara, Auteur ; Andy McGill, Auteur ; Martijn Rijsdijk, Auteur ; Mark Tabor, Auteur ; Vincent Tournadre , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2013 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 40-1/W2 Conférence : ISPRS 2013, UAV-g 04/09/2013 06/09/2013 Rostock Allemagne OA Proceedings archives Importance : pp 93 - 99 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] cadastre étranger [Termes IGN] cadastre européen [Termes IGN] drone [Termes IGN] état de l'art [Termes IGN] image captée par drone [Termes IGN] innovation technologique [Termes IGN] organisme cartographique national [Termes IGN] photogrammétrie aérienne [Termes IGN] Rhône (bassin) [Termes IGN] Swisstopo Résumé : (auteur) Following the latest developments in Remotely Piloted Airborne Systems (RPAS) industry and attending some of the most prominent fairs related to the field of geomatics one easily recognizes that it is RPAS, which is strongly pushed into the civilian market. It really is of interest, if official authorities like National Mapping Agencies (NMAs) are starting to implement the RPASs technology within their specific data acquisition processes – to establish alternatives to their traditional manned photogrammetric survey flights. The European Spatial Data Research organization (EuroSDR), representing European NMAs and research organizations of currently 17 European states, is following UAV developments since end of 2004, where an ongoing activity was created, to continuously update their members on the developments in this technology. As systems consolidated, new impetus was given to more deeply explore the potential RPAS for national mapping. Today first national mapping agencies have already used RPAS based data for first experiments in mapping. Several NMAs are discussing on the future role of this technology within their agencies. This report will try to give an overview on the current situation on the use of RPAS in European mapping agencies. Based on the input from some selected NMAs, their expectations on RPAS technology, the fields of use they foresee in their country specific surroundings and – exemplarily – first experiences with this type of technology will be presented. Even though the use of RPAS in NMAs is still new, substantial technical and operational benefits become obvious already. With that, the paper will try to give a state-of-the-art report on the current activities and overall acceptance of RPAS technology in European photogrammetric mapping. Numéro de notice : C2013-059 Affiliation des auteurs : LASTIG LOEMI+Ext (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XL-1-W2-93-2013 Date de publication en ligne : 16/08/2013 En ligne : http://dx.doi.org/10.5194/isprsarchives-XL-1-W2-93-2013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98503

A flexible mathematical method for calibration in digital aerial photogrammetry / Rongfu Tang in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 10 (October 2012)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 10 (October 2012) . - pp 1069 - 1077 Titre : A flexible mathematical method for calibration in digital aerial photogrammetry Type de document : Article/Communication Auteurs : Rongfu Tang, Auteur ; Dieter Fritsch, Auteur ; Michael Cramer, Auteur ; W. Schneider, Auteur Année de publication : 2012 Article en page(s) : pp 1069 - 1077 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] auto-étalonnage [Termes IGN] caméra numérique [Termes IGN] chambre DTC [Termes IGN] élément d'orientation interne [Termes IGN] étalonnage de chambre métrique [Termes IGN] photogrammétrie aérienne [Termes IGN] polynôme de Legendre [Termes IGN] test de performance Résumé : (Auteur) Self-calibration plays a significant role in the automatic interior/exterior orientation of camera systems. This paper presents a new family of self-calibration additional parameters (aps) for digital airborne camera calibration. Photogrammetric self-calibration can (to a very large extent) be considered as a function approximation problem in mathematics. Based on the rigorous approximation theory, a new family of so-called Legendre self-calibration APs is developed from the orthogonal Legendre Polynomials. An approach is suggested to assess the full potential of in-situ camera calibration. The performance of Legendre aps is investigated in many field tests on the DMC, UltracamX, UltracamXp and DigiCAM camera systems. The external accuracy in the tests can reach 0.2 GSD and 0.4 GSD in horizontal and vertical dimensions, respectively. The posterior standard deviation estimation of image measurements is approx. 0.12 pixel or even less. The advantages of Legendre aps are illustrated over the conventional counterparts. From both the theoretical and practical views, Legendre aps are orthogonal, rigorous, flexible, and effective for calibrating frame-format airborne cameras. Numéro de notice : A2012-486 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.10.1069 En ligne : https://doi.org/10.14358/PERS.78.10.1069 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31932 [article]

New rigorous and flexible Fourier self-calibration models for airborne camera calibration / Rongfu Tang in ISPRS Journal of photogrammetry and remote sensing, vol 71 (July 2012)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 71 (July 2012) . - pp 76 - 85 Titre : New rigorous and flexible Fourier self-calibration models for airborne camera calibration Type de document : Article/Communication Auteurs : Rongfu Tang, Auteur ; Dieter Fritsch, Auteur ; Michael Cramer, Auteur Année de publication : 2012 Article en page(s) : pp 76 - 85 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] approximation [Termes IGN] auto-étalonnage [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] étalonnage de chambre métrique [Termes IGN] photogrammétrie aérienne [Termes IGN] série de Fourier Résumé : (Auteur) This paper presents a new family of rigorous and flexible mathematical self-calibration additional parameters (APs) for airborne camera calibration. Photogrammetric self-calibration can – to a very large extent – be considered as a function approximation problem in mathematics. It is shown, that algebraic polynomials are less desirable for designing self-calibration APs due to the highly correlated terms. Based on the mathematical approximation theory, we suggest that Fourier series be the optimal mathematical basis functions for self-calibration purpose. A whole family of so-called Fourier self-calibration APs is developed, whose solid theoretical foundations are the Laplace’s Equation and the Fourier Theorem. Fourier APs are orthogonal, rigorous, flexible, generic and efficient for calibrating the image distortion of frame-format airborne cameras. The high performance of Fourier APs is demonstrated in many practical tests on different camera systems, including the DMC, DMCII, UltracamX, UltracamXp and DigiCAM cameras. We illustrate the theoretical and practical advantages of the Fourier APs over the physical APs and the popular polynomial APs. The joint applications with physical models are promoted for specific applications as well. On account of the theoretical justifications and high practical performance, Fourier APs should be preferred for in situ airborne camera calibration. Numéro de notice : A2012-349 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.05.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.05.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31795 [article]

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DGPF projec t: evaluation of digital photogrammetric aerial-based imaging systems: overview and results from the pilot center / Michael Cramer in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 9 (September 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 9 (September 2010) . - pp 1019 - 1029 Titre : DGPF projec t: evaluation of digital photogrammetric aerial-based imaging systems: overview and results from the pilot center Type de document : Article/Communication Auteurs : Michael Cramer, Auteur ; Norbert Haala, Auteur Année de publication : 2010 Article en page(s) : pp 1019 - 1029 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] photogrammétrie aérienne [Termes IGN] précision géométrique (imagerie) [Termes IGN] test de performance Résumé : (Auteur) Within this paper, results of a test on the evaluation of the most recent photogrammetric digital airborne camera systems are presented. This project was initiated by the German Society of Photogrammetry, Remote Sensing and Geoinformation (DGPF), based on data from 12 different digital sensor systems flown in a well-controlled test site. The main topics of the evaluation phase are the analysis of geometric accuracy and sensor calibration, the radiometric performance including on-site radiometric calibration and multi-spectral land classifications, the performance of photogrammetric Digital Surface Model (dsm) generation, and the potential of manual stereoplotting from digital images. Within this paper, only results obtained at the Institute of Photogrammetry (iff), Universitaet Stuttgart will be presented, comprehensively proving the high performance of digital camera systems and processing. The IFF served as the pilot center and additionally concentrated on the investigation of camera geometry and the image based generation of height data. Numéro de notice : A2010-365 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.9.1019 En ligne : https://doi.org/10.14358/PERS.76.9.1019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30559 [article]

Digital airborne photogrammetry - a new tool for quantitative remote sensing? - a state-of-the-art review on radiometric aspects of digital photogrammetric images / Eija Honkavaara in Remote sensing, vol 1 n° 3 (September 2009)  

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Digital camera calibration / Michael Cramer (July 2009)  

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Calibration and validation of digital airborne cameras / P. Boccardo in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)

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The ADS40 Vaihingen/Enz geometric performance test / Michael Cramer in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 6 (September 2006)  

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Experiences on operational GPS: inertial system calibration in airborne photogrammetry / Michael Cramer in GIS Geo-Informations-Systeme, vol 2002 n° 6 (Juni 2002)

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Genauigkeitsuntersuchungen zur GPS/INS-Integration in der Aerophotogrammetrie / Michael Cramer (2001)  

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