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Exploiting multi-camera constraints within bundle block adjustment: an experimental comparison / Eleonora Maset (2021)  

Public Titre : Exploiting multi-camera constraints within bundle block adjustment: an experimental comparison Type de document : Article/Communication Auteurs : Eleonora Maset, Auteur ; Ewelina Rupnik , Auteur ; Marc Pierrot-Deseilligny , Auteur ; Fabio Remondino, Auteur ; Andrea Fusiello, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2021 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. XLIII-B2-2021 Projets : 1-Pas de projet / Conférence : ISPRS 2021, Commission 2, XXIV ISPRS Congress, Imaging today foreseeing tomorrow 05/07/2021 09/07/2021 Nice Virtuel France OA Archives Commission 2 Importance : pp 33 - 38 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] aérotriangulation numérique [Termes IGN] analyse comparative [Termes IGN] compensation par faisceaux [Termes IGN] contrainte géométrique [Termes IGN] image oblique [Termes IGN] image terrestre [Termes IGN] instrumentation Leica [Termes IGN] orientation relative [Termes IGN] Stéréopolis Résumé : (auteur) The growing deployment of multi-head camera systems encouraged the emergence of specific processing algorithms, able to face the challenges posed by slanted view geometry. Such multi-camera systems are rigidly tied by their manufacturers hence the exploitation of this internal constraint should be further exploited. Several approaches have been proposed to deal with orientation constraints, with the aim of reducing the number of unknowns, computational time and possibly improve the accuracy. In this paper we compare the results provided by publicly available implementations in order to further investigate the advantages of enforcing relative orientation constraints for aerial and terrestrial triangulation of multi-head camera systems. Data from a Leica CityMapper and a Stereopolis-Ladybug are considered, reporting how constrained solution can improve accuracy with respect to traditional (unconstrained) bundle block adjustment solutions. Numéro de notice : C2021-013 Affiliation des auteurs : UGE-LaSTIG+Ext (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprs-archives-XLIII-B2-2021-33-2021 date de publication en ligne : 28/06/2021 En ligne : https://doi.org/10.5194/isprs-archives-XLIII-B2-2021-33-2021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98063

Mapping quality prediction for RTK/PPK-equipped micro-drones operating in complex natural environment / Emmanuel Cledat in ISPRS Journal of photogrammetry and remote sensing, vol 167 (September 2020)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 167 (September 2020) . - pp 24 - 38 Titre : Mapping quality prediction for RTK/PPK-equipped micro-drones operating in complex natural environment Type de document : Article/Communication Auteurs : Emmanuel Cledat, Auteur ; Laurent Valentin Jospin, Auteur ; D. A. Cucci, Auteur ; Jan Skaloud, Auteur Année de publication : 2020 Article en page(s) : pp 24 - 38 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation [Termes IGN] compensation par faisceaux [Termes IGN] image captée par drone [Termes IGN] modèle numérique de terrain [Termes IGN] plan de vol [Termes IGN] point d'appui [Termes IGN] positionnement cinématique en temps réel [Termes IGN] qualité cartographique [Termes IGN] temps de vol [Termes IGN] test statistique [Termes IGN] texture du sol Résumé : (auteur) Drone mapping with GNSS-assisted photogrammetry is a highly efficient method for surveying small- or medium-sized areas. However, the mapping quality is not intuitively predictable, particularly in complex environments (with steep and cluttered terrain), in which the quality of the real-time kinematic (RTK) or post-processed kinematic (PPK) positioning varies. We present a method to predict the mapping quality from the information that is available prior to the flight, such as the flight plan, expected flight time, approximate digital terrain model, prevailing surface texture, and embedded sensor characteristics. After detailing the important considerations, we also present the concept of global precision within the context of minimal and efficient ground control point placement in a complex terrain. Finally, we validate the proposed methodology by means of rigorous statistical testing against numerous experiments conducted under different mapping conditions. Numéro de notice : A2020-545 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2020.05.015 date de publication en ligne : 12/07/2020 En ligne : https://doi.org/10.1016/j.isprsjprs.2020.05.015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95771 [article]

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Accuracy assessment of real-time kinematics (RTK) measurements on unmanned aerial vehicles (UAV) for direct geo-referencing / Desta Ekaso in Geo-spatial Information Science, vol 23 n° 2 (June 2020)  

Public [article]  inGeo-spatial Information Science > vol 23 n° 2 (June 2020) . - pp 165 - 181 Titre : Accuracy assessment of real-time kinematics (RTK) measurements on unmanned aerial vehicles (UAV) for direct geo-referencing Type de document : Article/Communication Auteurs : Desta Ekaso, Auteur ; Francesco Nex, Auteur ; Norman Kerle, Auteur Année de publication : 2020 Article en page(s) : pp 165 - 181 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] aérotriangulation [Termes IGN] centrale inertielle [Termes IGN] géoréférencement direct [Termes IGN] image captée par drone [Termes IGN] instrument embarqué [Termes IGN] positionnement cinématique en temps réel [Termes IGN] précision du positionnement [Termes IGN] récepteur GNSS Résumé : (auteur) Geospatial information acquired with Unmanned Aerial Vehicles (UAV) provides valuable decision-making support in many different domains, and technological advances coincide with a demand for ever more sophisticated data products. One consequence is a research and development focus on more accurately referenced images and derivatives, which has long been a weakness especially of low to medium cost UAV systems equipped with relatively inexpensive inertial measurement unit (IMU) and Global Navigation Satellite System (GNSS) receivers. This research evaluates the positional accuracy of the real-time kinematics (RTK) GNSS on the DJI Matrice 600 Pro, one of the first available and widely used UAVs with potentially surveying-grade performance. Although a very high positional accuracy of the drone itself of 2 to 3 cm is claimed by DJI, the actual accuracy of the drone RTK for positioning the images and for using it for mapping purposes without additional ground control is not known. To begin with, the actual GNSS RTK position of reference center (the physical point on the antenna) on the drone is not indicated, and uncertainty regarding this also exists among the professional user community. In this study the reference center was determined through a set of experiments using the dual frequency static Leica GNSS with RTK capability. The RTK positioning data from the drone were then used for direct georeferencing, and its results were evaluated. Test flights were carried out over a 70 x 70 m area with an altitude of 40 m above the ground, with a ground sampling distance of 1.3 cm. Evaluated against ground control points, the planimetric accuracy of direct georeferencing for the photogrammetric product ranged between 30 and 60 cm. Analysis of direct georeferencing results showed a time delay of up to 0.28 seconds between the drone GNSS RTK and camera image acquisition affecting direct georeferencing results. Numéro de notice : A2020-319 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/10095020.2019.1710437 date de publication en ligne : 23/01/2020 En ligne : https://doi.org/10.1080/10095020.2019.1710437 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95184 [article]

Estudio de precision en la aerotriangulacion de bloques de imagenes obtenidas con UAV / Miguel Angel Lopez Gonzalez in Mapping : Teledetección, medio ambiante, cartografía, sistemas de información geográfica, vol 26 n° 185 (septembrie - octubre 2017)    

Public [article]  inMapping : Teledetección, medio ambiante, cartografía, sistemas de información geográfica > vol 26 n° 185 (septembrie - octubre 2017) . - pp 42 - 52 Titre : Estudio de precision en la aerotriangulacion de bloques de imagenes obtenidas con UAV Type de document : Article/Communication Auteurs : Miguel Angel Lopez Gonzalez, Auteur Année de publication : 2017 Article en page(s) : pp 42 - 52 Note générale : bibliographie Langues : Espagnol (spa) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation numérique [Termes IGN] chambre non métrique [Termes IGN] couple stéréoscopique [Termes IGN] drone [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] image aérienne [Termes IGN] monastère [Termes IGN] orthoimage [Termes IGN] précision géométrique (imagerie) Résumé : (auteur) This article deals with the use of unmanned platforms of less than 2 kg in weight for the aerial image acquisition, its subsequent processing and the study of the precision reached in aerotrian-gulation, a step prior to obtaining the final products. This is done using a flight made on the ruins of the monastery of Toni Roden in Hoxter, Germany. The aerotriangulation of the fli-ght with photogrammetric software is carried out in ten different assumptions in order to verify the aerotriangulation quality of blocks of images captured with RPAS photogrammetric systems with standard no nmetric cameras, the accuracy of ae roclria n-g ul etion processing without points of control in the field, it is studied if the use of non-metric cameras affects the accuracy of the products, the quality of the digital surface models generated from the dense cloud of points is checked and the scopes of use of the photogrammetric RPAS systems (Remotely Piloted Aircraft System). As main conclusions can be highlighted that, with the software used, better results are obtained in the aerotriangula-tion and in the final products increasing the overlap to 80% and that the use of non-metric cameras does not affect the accuracy. Numéro de notice : A2017-799 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article En ligne : http://revistas.revistamapping.com/MAPPING_185/MAPPING_185.html Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89141 [article]

Documents numériques

en open access Estudio de precision en la aerotriangulacion ... Adobe Acrobat PDF

GPS real-time precise point positioning for aerial triangulation / Junbo Shi in GPS solutions, vol 21 n° 2 (April 2017)  

Public [article]  inGPS solutions > vol 21 n° 2 (April 2017) . - pp 405 – 414 Titre : GPS real-time precise point positioning for aerial triangulation Type de document : Article/Communication Auteurs : Junbo Shi, Auteur ; Xiuxiao Yuan, Auteur ; Yang Cai, Auteur ; Gaojing Wang, Auteur Année de publication : 2017 Article en page(s) : pp 405 – 414 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] aérotriangulation [Termes IGN] antenne [Termes IGN] coordonnées GNSS [Termes IGN] point de vérification [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement ponctuel précis Résumé : (auteur) We extend the application of real-time kinematic PPP to aerial triangulation using GPS to determine coordinates of the antenna installed on the airplane, using real-time satellite products from IGS and the CNES Analysis Center. In order to verify the performance of real-time kinematic PPP for aerial triangulation, three tests with varying aerial and ground conditions are assessed. Numerical results show that real-time kinematic PPP using IGS real-time products of 5-cm orbit accuracy and 0.1- to 0.3-ns clock precision can provide comparable accuracy for aerial photogrammetric mapping at the scale of 1:1000 as does post-mission kinematic PPP using IGS final products. Millimeter-to-centimeter-level differences and centimeter-to-2-decimeter differences are identified for horizontal and vertical coordinates of ground check points, respectively, in the three tests. The comparison between real-time IGS and CNES products for GPS positioning and aerial triangulation unveils that real-time products with a better clock precision can result in better performance of GPS real-time kinematic PPP as applied to aerial triangulation. Numéro de notice : A2017-248 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-016-0532-2 En ligne : http://dx.doi.org/10.1007/s10291-016-0532-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85055 [article]

Auscultation de l’état de surface de revêtements routiers par photogrammétrie automatisée / Gildas Allaz in XYZ, n° 146 (mars - mai 2016)

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Auscultation de l'état de surface de revêtements routiers par photogrammétrie automatisée / Gildas Allaz in Géomatique suisse, vol 114 n° 1 (janvier 2016)  

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Photogrammetric computer vision / Wolfgang Förstner (2016)

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LiDAR strip adjustment using multifeatures matched with aerial images / Yongjun Zhang in IEEE Transactions on geoscience and remote sensing, vol 53 n° 2 (February 2015)  

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L’apport des modélisations 3D pour l’étude de la grotte Blanchard (Saint-Marcel, Indre, France), bilan et perspectives pour l’analyse croisée des données / Eric Robert (2014) 

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Geometric analysis and self-calibration of ADS40 imagery / Sara Gonzalez in Photogrammetric record, vol 28 n° 142 (June - August 2013)  

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n° 198 - 199 - Septembre 2012 - Brésil (Bulletin de Revue Française de Photogrammétrie et de Télédétection) / Société française de photogrammétrie et de télédétection

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Photogrammetric control points from airborne laser scanner data / Q. Dalmolin in Revue Française de Photogrammétrie et de Télédétection, n° 198 - 199 (Septembre 2012)

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Fast AT: a simple procedure for quasi direct orientation / M. Blazquez in ISPRS Journal of photogrammetry and remote sensing, vol 71 (July 2012)

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Automatic tie-point extraction / Z. Shragai in GIM international, vol 26 n° 4 (April 2012)

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