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Geometric model and assessment of a dual‐fisheye imaging system / Mariana Batista Campos in Photogrammetric record, vol 33 n° 162 (June 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 162 (June 2018) . - pp 243 - 263 Titre : Geometric model and assessment of a dual‐fisheye imaging system Type de document : Article/Communication Auteurs : Mariana Batista Campos, Auteur ; Antonio Maria Garcia Tommaselli, Auteur ; José Marcato, Auteur ; Eija Honkavaara, Auteur Année de publication : 2018 Article en page(s) : pp 243 - 263 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] chambre panoramique [Termes descripteurs IGN] compensation par faisceaux [Termes descripteurs IGN] contrainte de stabilité [Termes descripteurs IGN] élément d'orientation interne [Termes descripteurs IGN] étalonnage de chambre métrique [Termes descripteurs IGN] lentille [Termes descripteurs IGN] panorama sphérique Résumé : (Auteur) This paper presents a technique for the calibration of a 360° dual imaging system (Ricoh Theta S) composed of two cameras with fisheye lenses specially mounted in a common structure. The experiments are based on calibration with a bundle adjustment using the equidistant fisheye lens model and relative orientation stability constraints, such as distance, base elements and rotation matrix between individual cameras’ coordinate systems. As a result, an equidistant mathematical model using the Conrady–Brown lens distortion model was shown to be suitable for estimating the interior and relative orientation parameters of the Ricoh Theta S. The main contribution presented in this work is a simultaneous bundle adjustment approach with stability constraints on base elements and rotation matrix angles, which achieved accuracies comparable with conventional photogrammetric calibration with perspective cameras. Numéro de notice : A2018-225 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12240 date de publication en ligne : 15/05/2018 En ligne : https://doi.org/10.1111/phor.12240 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90046 [article]

Modelling and automated calibration of a general multi‐projective camera / Ehsan Khoramshahi in Photogrammetric record, vol 33 n° 161 (March 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 161 (March 2018) . - pp 86 - 112 Titre : Modelling and automated calibration of a general multi‐projective camera Type de document : Article/Communication Auteurs : Ehsan Khoramshahi, Auteur ; Eija Honkavaara, Auteur Année de publication : 2018 Article en page(s) : pp 86 - 112 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] chambre métrique [Termes descripteurs IGN] compensation par faisceaux [Termes descripteurs IGN] étalonnage de chambre métrique [Termes descripteurs IGN] modélisation géométrique de prise de vue Résumé : (Auteur) Recently, multi‐projective cameras (MPCs), often based on frame‐mounted multiple cameras with a small baseline and arbitrary overlap, have found a remarkable place in geomatics and vision‐based applications. This paper outlines the geometric calibration of a general MPC by presenting a mathematical model that describes its unknown generic geometry. A modified bundle block adjustment is employed to calibrate an industrial‐level 360° non‐metric camera. The structure of any MPC can be retrieved as a calibration set of relative and interior orientation parameters (as well as the pose of the MPC shots) using a calibration room which has been accurately determined by close range photogrammetry. To demonstrate the efficiency and precision of the model, a Panono camera (an MPC with 36 individual cameras) was calibrated. After the adjustment, sub‐pixel image residuals and acceptable object‐space errors were observed. Numéro de notice : A2018-221 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12230 date de publication en ligne : 28/02/2018 En ligne : https://doi.org/10.1111/phor.12230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90041 [article]

Hyperspectral UAV-imagery and photogrammetric canopy height model in estimating forest stand variables / Sakari Tuominen in Silva fennica, vol 51 n° 5 (2017)  

Public [article]  inSilva fennica > vol 51 n° 5 (2017) Titre : Hyperspectral UAV-imagery and photogrammetric canopy height model in estimating forest stand variables Type de document : Article/Communication Auteurs : Sakari Tuominen, Auteur ; Andras Balazs, Auteur ; Eija Honkavaara, Auteur ; et al., Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] classification barycentrique [Termes descripteurs IGN] drone [Termes descripteurs IGN] estimation de quantité [Termes descripteurs IGN] étalonnage radiométrique [Termes descripteurs IGN] image aérienne [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] image RVB [Termes descripteurs IGN] inventaire forestier (techniques et méthodes) [Termes descripteurs IGN] modèle numérique de surface de la canopée [Termes descripteurs IGN] peuplement forestier [Termes descripteurs IGN] photogrammétrie numérique [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Remote sensing using unmanned aerial vehicle (UAV) -borne sensors is currently a highly interesting approach for the estimation of forest characteristics. 3D remote sensing data from airborne laser scanning or digital stereo photogrammetry enable highly accurate estimation of forest variables related to the volume of growing stock and dimension of the trees, whereas recognition of tree species dominance and proportion of different tree species has been a major complication in remote sensing-based estimation of stand variables. In this study, the use of UAV-borne hyperspectral imagery was examined in combination with a high-resolution photogrammetric canopy height model in estimating forest variables of 298 sample plots. Data were captured from eleven separate test sites under weather conditions varying from sunny to cloudy and partially cloudy. Both calibrated hyperspectral reflectance images and uncalibrated imagery were tested in combination with a canopy height model based on RGB camera imagery using the k-nearest neighbour estimation method. The results indicate that this data combination allows accurate estimation of stand volume, mean height and diameter: the best relative RMSE values for those variables were 22.7%, 7.4% and 14.7%, respectively. In estimating volume and dimension-related variables, the use of a calibrated image mosaic did not bring significant improvement in the results. In estimating the volumes of individual tree species, the use of calibrated hyperspectral imagery generally brought marked improvement in the estimation accuracy; the best relative RMSE values for the volumes for pine, spruce, larch and broadleaved trees were 34.5%, 57.2%, 45.7% and 42.0%, respectively. Numéro de notice : A2017-645 Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14214/sf.7721 En ligne : https://doi.org/10.14214/sf.7721 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=87000 [article]

Geometric calibration of a hyperspectral frame camera / Raquel A. de Oliveira in Photogrammetric record, vol 31 n° 155 (September - November 2016)

Public [article]  inPhotogrammetric record > vol 31 n° 155 (September - November 2016) . - pp 325 - 347 Titre : Geometric calibration of a hyperspectral frame camera Type de document : Article/Communication Auteurs : Raquel A. de Oliveira, Auteur ; Antonio Maria Garcia Tommaselli, Auteur ; Eija Honkavaara, Auteur Année de publication : 2016 Article en page(s) : pp 325 - 347 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] étalonnage de capteur (imagerie) [Termes descripteurs IGN] étalonnage géométrique [Termes descripteurs IGN] filtre adaptatif [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] interféromètre Résumé : (Auteur) Recently, miniaturised hyperspectral sensors operable from small unmanned airborne vehicle platforms have entered the market. The emerging hyperspectral imaging technologies, based on frame cameras and tuneable filters, are attractive alternatives to hyperspectral pushbroom sensors. This paper addresses the geometric calibration process of a hyperspectral frame camera based on a Fabry–Perot interferometer. However, the addition of more optical elements in front of the image sensor can affect the parameters related to the internal geometry of the camera, and a deficiency in knowledge regarding these parameters can have a critical effect on the accuracy of 3D measurements in photogrammetric applications. The experiments focused on assessing the self-calibrating bundle adjustment to verify the behaviour of the interior parameters, considering different spectral bands. The results indicated that the applied self-calibration method can accurately characterise the interior parameters of this camera and that one set of parameters is required for each internal sensor. Numéro de notice : A2016-724 Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82256 [article]

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On the use of RPAS in national mapping : The EuroSDR point of view / Michael Cramer in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XL-1 W2 (September 2013)    

Public [article]  inISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > XL-1 W2 (September 2013) . - pp 93-99 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 Congrès : UAV-g2013 (4 – 6 septembre 2013; Rostock, Allemagne), Commanditaire Année de publication : 2013 Article en page(s) : pp 93-99 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] cadastre étranger [Termes descripteurs IGN] cadastre européen [Termes descripteurs IGN] drone [Termes descripteurs IGN] état de l'art [Termes descripteurs IGN] Europe (géographie politique) [Termes descripteurs IGN] innovation technologique [Termes descripteurs IGN] organisme cartographique national [Termes descripteurs IGN] photogrammétrie aérienne [Termes descripteurs IGN] Rhône (bassin) [Termes descripteurs 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 : C2013-054 Thématique : IMAGERIE Nature : Communication nature-HAL : ArtAvecCL-RevueIntern/ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XL-1-W2-93-2013 date de publication en ligne : 16/08/2013 En ligne : https://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=92060 [article]

Documents numériques

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EuroSDR-Project, Commission 1 and Commission 2 / Eija Honkavaara (March 2013)    

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EuroSDR project Commission 1, Radiometric aspects of digital photogrammetric images / Eija Honkavaara (2013)

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Calibrating and validating multispectral 3D imaging systems at a permanent test site: case study with an Intergraph DMC / Eija Honkavaara in Photogrammetric record, vol 26 n° 134 (June - August 2011)

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The EuroSDR project "radiometric aspects of digital photogrammetric images" / Eija Honkavaara (01/06/2011)

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Radiometric stability assessment of an airborne photogrammetric sensor in a test field / Lauri Markelin in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 4 (July - August 2010)

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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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Radiometric calibration and characterization of large-format digital photogrammetric sensors in a test field / Lauri Markelin in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 12 (December 2008)

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Evaluation of resolving power and MTF of DMC / Eija Honkavaara in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)

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Geometric test field calibration of digital photogrammetric sensors / Eija Honkavaara in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 6 (September 2006)

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Orientation of optical airborne and spaceborne images for small and medium scale mapping purposes / Eija Honkavaara (1999)

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