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Absolute field calibration for multi-GNSS receiver antennas at ETH Zurich / Daniel Willi in GPS solutions, vol 24 n° 1 (January 2020)  

Public [article]  inGPS solutions > vol 24 n° 1 (January 2020) Titre : Absolute field calibration for multi-GNSS receiver antennas at ETH Zurich Type de document : Article/Communication Auteurs : Daniel Willi, Auteur ; Simon Lutz, Auteur ; Elmar Brockmann, Auteur ; Markus Rothacher, Auteur Année de publication : 2020 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] antenne Galileo [Termes IGN] antenne GNSS [Termes IGN] antenne GPS [Termes IGN] centre de phase [Termes IGN] données Galileo [Termes IGN] données GPS [Termes IGN] données multicapteurs [Termes IGN] étalonnage au sol [Termes IGN] étalonnage d'instrument [Termes IGN] étalonnage des données [Termes IGN] international GPS service for geodynamics [Termes IGN] mesurage de phase [Termes IGN] récepteur GNSS [Termes IGN] robot [Termes IGN] signal GNSS [Termes IGN] Zurich (Suisse) Résumé : (Auteur) ETH Zurich developed an absolute GNSS antenna calibration system based on measurements taken in the field. An industrial robot is used to rotate and tilt the antenna to be calibrated. This procedure ensures good coverage of the antenna hemisphere and reduces systematic errors. The calibration system at ETH Zurich is validated by a direct comparison of the obtained calibrations with calibrations from the anechoic chamber method (University of Bonn) and from another absolute field calibration method (Geo++® GmbH). Calibrations by ETH Zurich agree on the sub-millimeter level with both reference calibrations. A second validation was conducted using real measurements on short baselines. Data were acquired on four stations in direct vicinity and processed using different phase center correction models. The experiment shows that individual corrections of ETH Zurich reduce the residuals in the coordinate domain when compared to type-mean calibrations of the International GNSS Service (IGS). However, residual biases between GPS and Galileo coordinates remain. These biases are efficiently reduced when using the new type-mean calibrations from the IGS that include calibration values for all GNSS, including Galileo. The ETH Zurich calibration system is proven to deliver meaningful calibrations that agree with other calibrations on the millimeter level in the azimuth and elevation domain. The field validation shows evidence that the consistency of the Galileo and GPS calibration should be further enhanced by performing a combined GPS and Galileo analysis, which is not yet implemented. Numéro de notice : A2020-020 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10291-019-0941-0 Date de publication en ligne : 19/12/2019 En ligne : https://doi.org/10.1007/s10291-019-0941-0 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94460 [article]

Absolute spectroradiometric calibration of the ADS40 sensor / U. Beisl in Revue Française de Photogrammétrie et de Télédétection, n° 181 (Mars 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 181 (Mars 2006) . - pp 14 - 18 Titre : Absolute spectroradiometric calibration of the ADS40 sensor Type de document : Article/Communication Auteurs : U. Beisl, Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 14 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ADS40 [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] correction atmosphérique [Termes IGN] étalonnage au sol [Termes IGN] étalonnage de chambre métrique [Termes IGN] étalonnage radiométrique [Termes IGN] étalonnage spectral Résumé : (Auteur) Digital cameras have spectral and radiometric properties superior to analogue film cameras. Due to its radiometrically stable construction, the ADS40 sensor is capable of making images for cartography as well as remote sensing applications. For the increased size of current projects, for sensor fusion, as well as for change detection purposes it is necessary to produce comparable images for different flight conditions (weather, camera system, etc.). This is not possible with classical film cameras since comparable images require the absolute radiometric calibration of the imaging system, before atmospheric correction, reflectance calibration and BRDF correction can take place. The methods for satellite laboratory calibration can be also used for digital airborne cameras. A laboratory calibration of the ADS40 is made with a calibrated integrating sphere in order to determine dark signal, lens falloff, and radiometric gain for each sensor line. For the ADS40 a linear radiometric model is sufficiently accurate. The knowledge of the system spectral response allows a more accurate calculation of the radiometric calibration coefficients and is a check for system integrity. In order to provide a regional camera service, radiometric calibration facilities are being established on several service sites of the world. Copyright SFPT Numéro de notice : A2006-614 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T11-49.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28337 [article]

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Potential for calibrating airborne video imagery using preflight calibration coefficients / A. Edirisinghe in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 5 (May 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 5 (May 2004) . - pp 573 - 580 Titre : Potential for calibrating airborne video imagery using preflight calibration coefficients Type de document : Article/Communication Auteurs : A. Edirisinghe, Auteur ; J.P. Louis, Auteur ; G.E. Chapman, Auteur Année de publication : 2004 Article en page(s) : pp 573 - 580 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra vidéo numérique [Termes IGN] capteur aérien [Termes IGN] étalonnage au sol [Termes IGN] étalonnage radiométrique [Termes IGN] image vidéo [Termes IGN] modèle de transfert radiatif Résumé : (Auteur) The low-cost Multispectral Airborne Video System (MAVS), developed using off-the-shelf components, is predominantly being used for agricultural and environmental monitoring applications in Australia. In order to guarantee quality of operational imagery regular radiometric calibration checks, under both preflight and in-flight environments, are a necessity. While preflight calibration is conducted in the field with relative ease, to conduct in-flight calibration checks during operational missions is difficult, especially when onboard calibration instrumentation is not available. The calibration of MAVS imagery in flight requires a radiative transfer code such as the 6S to simulate the radiation signal at the operational altitude. A comparison of the simulated in-flight calibration equation with the corresponding preflight calibration equation showed a statistically significant agreement for every MAVS band, demonstrating the stability of response of the instrument in the air. This MAVS response stability indicates a potential for calibrating operational airborne imagery using preflight calibration equations. A few simulated in-flight calibration checks, in addition to regular preflight calibrations, could still be carried out during the flight season to verify system radiometric response in the air. Numéro de notice : A2004-180 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.5.573 En ligne : https://doi.org/10.14358/PERS.70.5.573 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26707 [article]

Digital image georeferencing from a multiple camera system by GPS-INS / M.M. Mostafa in ISPRS Journal of photogrammetry and remote sensing, vol 56 n° 1 (May - June 2001)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 56 n° 1 (May - June 2001) . - pp 1 - 12 Titre : Digital image georeferencing from a multiple camera system by GPS-INS Type de document : Article/Communication Auteurs : M.M. Mostafa, Auteur ; K.P. Schwarz, Auteur Année de publication : 2001 Article en page(s) : pp 1 - 12 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] aérotriangulation [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] chambre métrique [Termes IGN] erreur moyenne quadratique [Termes IGN] erreur moyenne quadratique altimétrique [Termes IGN] étalonnage au sol [Termes IGN] étalonnage en vol [Termes IGN] géoréférencement direct [Termes IGN] GPS en mode différentiel [Termes IGN] GPS-INS [Termes IGN] image aérienne [Termes IGN] objet géographique 3D [Termes IGN] point d'appui Résumé : (Auteur) In this paper, the development and testing of an airborne fully digital multi-sensor system for digital mapping data acquisition is presented. The system acquires two streams of data, namely, navigation (georeferencing) data and imaging data. The navigation data are obtained by integrating an accurate strapdown inertial navigation system with a differential GPS system (DGPS). The imaging data are acquired by two low-cost digital cameras, configured in such a way so as to reduce their geometric limitations. The two cameras capture strips of overlapping nadir and oblique images. The GPS/INS-derived trajectory contains the full translational and rotational motion of the carrier aircraft. Thus, image exterior orientation information is extracted from the trajectory, during post-processing. This approach eliminates the need for ground control (GCP) when computing 3D positions of objects that appear in the field of view of the system imaging component. Two approaches for calibrating the system are presented, namely, terrestrial calibration and in-flight calibration. Test flights were conducted over the campus of The University of Calgary. Testing the system showed that best ground point positioning accuracy at 1:12,000 average image scale is 0.2 m (RMS) in casting and northing and 0.3 m (RMS) in height. Preliminary results indicate that major applications of such a system in the future are in the field of digital mapping, at scales of 1:5000 and smaller, and in the generation of digital elevation models for engineering applications. Copyright ISPRS Numéro de notice : A2001-216 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(01)00030-2 En ligne : https://doi.org/10.1016/S0924-2716(01)00030-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21910 [article]

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ASTER preflight and inflight calibration and the validation of level 2 products / K. Thome in IEEE Transactions on geoscience and remote sensing, vol 36 n° 4 (July 1998)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 36 n° 4 (July 1998) . - pp 1161 - 1172 Titre : ASTER preflight and inflight calibration and the validation of level 2 products Type de document : Article/Communication Auteurs : K. Thome, Auteur ; et al., Auteur Année de publication : 1998 Article en page(s) : pp 1161 - 1172 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] Advanced Spaceborne Thermal Emission and Reflection Radiometer [Termes IGN] étalonnage au sol [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] étalonnage en vol [Termes IGN] image Terra-ASTER Numéro de notice : A1998-228 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/36.701023 En ligne : https://ieeexplore.ieee.org/document/701023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26192 [article]

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MISR prelaunch instrument calibration and characterization results / Carol J. Bruegge in IEEE Transactions on geoscience and remote sensing, vol 36 n° 4 (July 1998)  

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