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Geometric modelling and calibration of a spherical camera imaging system / Derek D. Lichti in Photogrammetric record, vol 35 n° 170 (June 2020)  

Public [article]  inPhotogrammetric record > vol 35 n° 170 (June 2020) . - pp 123 - 142 Titre : Geometric modelling and calibration of a spherical camera imaging system Type de document : Article/Communication Auteurs : Derek D. Lichti, Auteur ; David Jarron, Auteur ; Wynand Tredoux, Auteur ; et al., Auteur Année de publication : 2020 Article en page(s) : pp 123 - 142 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] acquisition d'images [Termes IGN] auto-étalonnage [Termes IGN] caméra 3D [Termes IGN] colinéarité [Termes IGN] distorsion radiale [Termes IGN] instrument de photogrammétrie [Termes IGN] modélisation géométrique de prise de vue [Termes IGN] orientation relative [Termes IGN] reconstruction 3D [Termes IGN] système de numérisation mobile Résumé : (auteur) The Ladybug5 is an integrated, multi‐camera system that features a near‐spherical field of view. It is commonly deployed on mobile mapping systems to collect imagery for 3D reality capture. This paper describes an approach for the geometric modelling and self‐calibration of this system. The collinearity equations of the pinhole camera model are augmented with five radial lens distortion terms to correct the severe barrel distortion. Weighted relative orientation stability constraints are added to the self‐calibrating bundle adjustment solution to enforce the angular and positional stability between the Ladybug5’s six cameras. Centimetre‐level 3D reconstruction accuracy can be achieved, with image‐space precision and object‐space accuracy improved by 92% and 93% , respectively, relative to a two‐term lens distortion model. Sub‐pixel interior orientation stability and millimetre‐level relative orientation stability were also demonstrated over a 10‐month period. Numéro de notice : A2020-401 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12315 Date de publication en ligne : 29/06/2020 En ligne : https://doi.org/10.1111/phor.12315 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95438 [article]

Precision orbit determination standards for the Jason series of altimeter missions / L. Cerri in Marine geodesy, vol 33 suppl 1 (August 2010)  

Public [article]  inMarine geodesy > vol 33 suppl 1 (August 2010) . - pp 379 - 418 Titre : Precision orbit determination standards for the Jason series of altimeter missions Type de document : Article/Communication Auteurs : L. Cerri, Auteur ; Jean-Paul Berthias, Auteur ; Willy I. Bertiger, Auteur ; Bruce J. Haines, Auteur ; F. Lemoine, Auteur ; F. Mercier, Auteur ; J.C. Ries, Auteur ; Pascal Willis , Auteur ; Nikita P. Zelensky, Auteur ; Marek Ziebart, Auteur Année de publication : 2010 Article en page(s) : pp 379 - 418 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales [Termes IGN] distorsion radiale [Termes IGN] Jason [Termes IGN] mission spatiale [Termes IGN] orbitographie Résumé : (Auteur) The Jason-1 altimeter satellite and its follow-on mission Jason-2/OSTM were launched in December 2001 and June 2008, respectively, to provide the scientific community with a high-accuracy continuous record of observations of the ocean surface topography. Both missions carry on board three state-of-the-art tracking systems (DORIS, GPS, SLR) to meet the requirement of better-than-1.5 cm radial accuracy for the operational orbit included in the geophysical data record (GDR) product. This article outlines the common set of models and processing techniques applied to both Jason reprocessed and operational orbits included in version C of the GDR, referred to as GDR-C standards for precision orbit determination (POD), and describes the systematic components of the radial error budget that are of most interest for the altimeter data analysts. The nonsystematic component of the error budget, quantified by intercomparison of orbits using similar models or with reduced dependency on the dynamic models, is generally at or below 7 mm RMS (root-mean-square). In particular, the average daily RMS of the radial difference between the JPL and CNES reduced-dynamic orbits on Jason-2 is below 6 mm. Concerning the dynamic models employed, the principal contributors to residual systematic differences appear to be the time varying gravity and solar radiation pressure, resulting in geographically correlated periodic signals that have amplitudes at the few-mm level. Concerning the drifts of the orbits along the North/South direction, all solutions agree to better than the 1 mm/year level. Numéro de notice : A2010-642 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01490419.2010.488966 Date de publication en ligne : 09/08/2010 En ligne : https://doi.org/10.1080/01490419.2010.488966 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90716 [article]

A review and analyses of plumb-line calibration / J.L. Lerma in Photogrammetric record, vol 22 n° 118 (June - August 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 118 (June - August 2007) . - pp 135 - 150 Titre : A review and analyses of plumb-line calibration Type de document : Article/Communication Auteurs : J.L. Lerma, Auteur ; Miriam Cabrelles, Auteur Année de publication : 2007 Article en page(s) : pp 135 - 150 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] chambre non métrique [Termes IGN] distorsion radiale [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] fil à plomb Résumé : (Auteur) Radial and decentring distortion parameters have long been reported as fundamental elements in camera calibration, especially in digital close range photogrammetry. This paper reports on an investigation for the determination of both radial and decentring distortion parameters using analytical plumb-line calibration. Straight line patterns, ranging from 1, 2, 4, 10 and up to 20 lines, not strictly plumb, are examined on a set of distorted imagery. Additionally, not only the number of straight lines but also the linear image distribution is analysed. For that purpose, linear features have been distributed in different positions and orientations over the whole of the imagery. Furthermore, the relationship between the parameters mentioned and the location of the principal point is also analysed, and shows how sensitive they are to deviations from the centre of the sensor. The motivation for this paper is the measurement of the minimum number of linear features for proper calibration of non-metric digital cameras. Both radial and decentring distortion parameters are examined. Finally, some line patterns are recommended for making the plumb-line calibration technique a reliable, easy and fast procedure. Photogrammetrists could use it as a first step in the procedure of camera calibration; users who are not experts in photogrammetry could employ it as a final step. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-364 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00412.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00412.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28727 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Covariance propagation from GEM-L2 and GRIM-3M1P to TOPEX and ERS-1 orbits / J. Klokocnik (1989)

Public Titre : Covariance propagation from GEM-L2 and GRIM-3M1P to TOPEX and ERS-1 orbits Type de document : Monographie Auteurs : J. Klokocnik, Auteur ; C. Reigber, Auteur ; J. Kostelecky, Auteur ; H. Müller, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1989 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 289 Importance : 25 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8574-9 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] distorsion radiale [Termes IGN] ERS [Termes IGN] matrice de covariance [Termes IGN] orbitographie [Termes IGN] TOPEX Résumé : (Auteur) It is verified that the radial orbit errors estimated for the nominal TOPEX orbit are significantly reduced when the full variance-covariance matrix of GEM-L2 is propagated into the orbit instead of the variances of the GEM-L2 coefficients only. This is a fortunate but expected result for GEM-L2 at the TOPEX inclination. It is shown that the radial errors for TOPEX, using GRIM-3M1P variance-covariance matrix, or for ERS-1 with GEM-L2 or GRIM-3M1P are of a different nature with the ERS-1 inclination region nearly unsampled by the model's data; there is a small improvement only. Numerical results for ERS-1 and TOPEX orbits, obtained with GEM-L2 and GRIM-3M1P, are presented and discussed in a detail. Numéro de notice : 38855 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=57614

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
38855-01	21.10	Livre	Centre de documentation	Technologies spatiales	Disponible
38855-02	21.10	Livre	Centre de documentation	Technologies spatiales	Disponible

Radial and tangential distortion of aerial cameras / J. Hakkarainen (1983)

Public Titre : Radial and tangential distortion of aerial cameras Type de document : Rapport Auteurs : J. Hakkarainen, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1983 Collection : Reports of the Finnish Geodetic Institute num. 83-3 Importance : 49 p. ISBN/ISSN/EAN : 978-951-711-090-7 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie [Termes IGN] capteur aérien [Termes IGN] chambre de prise de vues argentique [Termes IGN] distorsion d'image [Termes IGN] distorsion radiale Index. décimale : 33.40 Photogrammétrie spatiale Numéro de notice : 54835 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=59705

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
54835-01	33.40	Livre	Centre de documentation	Photogrammétrie - Lasergrammétrie	Disponible