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Evaluation of MODIS data for improved monitoring of the Caspian Sea / Ayoub Moradi in International Journal of Remote Sensing IJRS, vol 35 n° 16 (January 2014)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 35 n° 16 (January 2014) . - pp 6060 - 6075 Titre : Evaluation of MODIS data for improved monitoring of the Caspian Sea Type de document : Article/Communication Auteurs : Ayoub Moradi, Auteur ; Laurent Métivier , Auteur ; Olivier de Viron, Auteur ; Stéphane Calmant, Auteur ; Catherine Mering, Auteur Année de publication : 2014 Article en page(s) : pp 6060 - 6075 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Caspienne, mer [Termes IGN] image infrarouge [Termes IGN] image optique [Termes IGN] image Terra-MODIS [Termes IGN] modèle numérique de surface [Termes IGN] trait de côte Résumé : (auteur) Moderate-Resolution Imaging Spectroradiometer (MODIS) optical and infrared data are used to monitor changes in the Caspian Sea coastline. The information extracted from MODIS images is converted into total water volume and mean lake level by combining a digital elevation model (DEM) with remote-sensing data. The elevation estimates were enhanced by reprocessing the MODIS data at the sub-pixel scale. The water volume variations estimated from MODIS data along with DEM are compared to other estimations derived from altimetry data sets, and show fair agreement. Numéro de notice : A2014-779 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431161.2014.943324 Date de publication en ligne : 22/08/2014 En ligne : http://dx.doi.org/10.1080/01431161.2014.943324 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78507 [article]

Absolute calibration of Jason radar altimeters from GPS kinematic campaigns over Lake Issykul / J.F. Cretaux in Marine geodesy, vol 34 n° 3-4 (July - december 2011)  

Public [article]  inMarine geodesy > vol 34 n° 3-4 (July - december 2011) . - pp 291 - 318 Titre : Absolute calibration of Jason radar altimeters from GPS kinematic campaigns over Lake Issykul Type de document : Article/Communication Auteurs : J.F. Cretaux, Auteur ; Stéphane Calmant, Auteur ; V. Romanovski, Auteur ; Félix Perosanz, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 291 - 318 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] altimètre radar [Termes IGN] campagne GPS [Termes IGN] étalonnage d'instrument [Termes IGN] GPS en mode pseudo-cinématique [Termes IGN] Jason [Termes IGN] Kirghizistan Résumé : (Auteur) This study presents results of calibration/validation (C/V) of Jason-1 and Jason-2 satellite altimeters over Lake Issykkul located in Kyrgyzstan, which was chosen as a dedicated radar altimetry C/V site in 2004. The objectives here are to estimate absolute altimeter biases and to quantify the altimetry instrument error budgets for lakes studies, including errors associated with the atmosphere media delay corrections of the radar signal, and with the different retracking mode used over “nonocean” surface. The C/V is conducted using various equipments, for example, GPS local network, moving GPS along the satellites tracks over the Lake Issykkul, in situ level gauges and weather stations. The absolute bias obtained for Jason-1 and Jason-2 from field campaigns conducted in 2008, 2009 and 2010 are 96 + 40 mm and 162 + 42 mm, respectively. The bias calculated for Jason-1 is in close agreement with estimates done at other dedicated C/V sites in the ocean, but the Jason-2 bias still differs by 1–2 cm with ocean C/V estimates. The relative bias (Jason-2 minus Jason-1) deduced from measurements during the tandem mission is estimated at 81 + 10 mm. The accuracy of Jason-1 and Jason-2 for the determination of the lake level variations as compared to the historical in situ gauges of the Lake Issykkul is 33 and 31 mm RMS, respectively. The bias between the two modes of retracking available on Jason-2 Geophysical Data Records (GDRs) has been estimated over the two first years of Jason-2 data over the Lake Issykkul. We found an average value of 234 + 40 mm, which is in good agreement with results obtained in a previous study on the Envisat satellite (Crétaux et al. 2009). Lake level studies using Jason-2 or Envisat must therefore take this relative bias into account if both retracked altimetry heights are used. Numéro de notice : A2011-462 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2011.584834 Date de publication en ligne : 22/08/2011 En ligne : https://doi.org/10.1080/01490419.2011.584834 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31356 [article]

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Absolute seafloor vertical positioning using combined pressure gauge and kinematic GPS data / Valérie Ballu in Journal of geodesy, vol 84 n° 1 (January 2010)  

Public [article]  inJournal of geodesy > vol 84 n° 1 (January 2010) . - pp 65 - 77 Titre : Absolute seafloor vertical positioning using combined pressure gauge and kinematic GPS data Type de document : Article/Communication Auteurs : Valérie Ballu, Auteur ; Marie-Noëlle Bouin , Auteur ; Stéphane Calmant, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 65 - 77 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] coordonnées GPS [Termes IGN] données marégraphiques [Termes IGN] fond marin [Termes IGN] GPS en mode cinématique [Termes IGN] Pacifique (océan) [Termes IGN] positionnement absolu [Termes IGN] profondeur [Termes IGN] séisme [Termes IGN] subduction [Termes IGN] tectonique des plaques [Termes IGN] Vanuatu Résumé : (Auteur) Knowledge of the position and motion of points on the seafloor can be critically important in both fundamental research (for example, global geodesy and plate tectonics) and for more practical applications such as seismic risk evaluation, off-shore construction and pipeline monitoring. In the Vanuatu subduction zone, for example, measuring deformation underwater could provide valuable information for modeling deformation and understanding the seismic cycle. We report a shallow water experiment in Vanuatu to measure the relative and absolute depth of seafloor points. The experiment differs from previous efforts mainly in that it uses the height of the sea surface determined by kinematic GPS, allowing us to locate the points in a global reference frame. The ITRF2005 ellipsoidal height of a seafloor benchmark was determined with a 1-sigma uncertainty of 0.7–2.1 cm. The estimated ellipsoidal height differs only by a few tenths of a centimeter between measurements made in 2004 and another set made in 2006. These results are encouraging and open new perspectives for vertical underwater deformation monitoring in shallow water areas. Sea-surface GPS measurements can also help to reduce the uncertainty in depth difference determination for relative measurements. Copyright Springer Numéro de notice : A2010-034 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0345-y Date de publication en ligne : 19/09/2009 En ligne : https://doi.org/10.1007/s00190-009-0345-y Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30230 [article]

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A kinematic GPS methodology for sea surface mapping, Vanuatu / Marie-Noëlle Bouin in Journal of geodesy, vol 83 n° 12 (December 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 12 (December 2009) Titre : A kinematic GPS methodology for sea surface mapping, Vanuatu Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin , Auteur ; Valérie Ballu, Auteur ; Stéphane Calmant, Auteur ; Jean-Michel Boré, Auteur ; Eric Folcher, Auteur ; Jérôme Ammann, Auteur Année de publication : 2009 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] GPS en mode cinématique [Termes IGN] relief de la surface de la mer [Termes IGN] station de référence [Termes IGN] subduction [Termes IGN] surface de la mer [Termes IGN] Vanuatu Résumé : (auteur) During the past few decades, satellite altimetry has brought tremendous new knowledge about the spatial and temporal variations of sea surface heights over the Earth’s oceans. However, the precision is limited over short wavelengths and in coastal areas, and other methods such as kinematic GPS may be needed to fill in this information. We present kinematic GPS work aimed at mapping the sea surface height, with special attention to the precision one can expect. Active marine subduction zones, like the Vanuatu archipelago, may present short wavelength, high amplitude undulations of the sea surface height that are difficult to map with satellite altimetry. This paper presents the methodology used around Santo Island, in Vanuatu, to obtain a well-resolved local sea surface map with a precision of 5–15 cm limited by the sea conditions and the distance from the coastal reference station. We present the results of three campaigns in 2004, 2006 and 2007. Careful observation of the ship behaviour along the surveys as well as simultaneous recording of the ship attitude variations is mandatory to obtain reliable results. We show that the ship GPS antenna height varies with the ship’s velocity and we suggest a method to correct this effect. The final precision is estimated using the crossover differences method. Numéro de notice : A2009-580 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0338-x En ligne : https://doi.org/10.1007/s00190-009-0338-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88649 [article]

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Improving resolution and accuracy of mean sea surface from kinematic GPS, Vanuatu subduction zone / Marie-Noëlle Bouin in Journal of geodesy, vol 83 n° 11 (November 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 11 (November 2009) . - pp 1017 - 1030 Titre : Improving resolution and accuracy of mean sea surface from kinematic GPS, Vanuatu subduction zone Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin , Auteur ; Valérie Ballu, Auteur ; Stéphane Calmant, Auteur ; Bernard Pelletier, Auteur Année de publication : 2009 Article en page(s) : pp 1017 - 1030 Note générale : biblographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] géoïde local [Termes IGN] GPS en mode cinématique [Termes IGN] surface de la mer [Termes IGN] Vanuatu Résumé : (auteur) Satellite altimetry provides an ocean mean sea surface (MSS) map with global coverage and overall excellent precision. However, in some areas, like the Vanuatu archipelago, the coverage and resolution of this tool are not sufficient to correctly map the short scale undulations of the sea surface, due to numerous islands and to strong lithospheric and mantle heterogeneities. New applications such as seafloor geodesy may require local mean surface representation with improved resolution in specific areas. We used sea surface height collected with kinematic GPS during three different cruises in 2004, 2006 and 2007 to reconstruct a homogeneous sea surface map around Santo Island, Vanuatu. We assess the accuracy of this GPS-derived local sea surface to 6–19 cm and evaluate the quality of existing altimetry and gravity-derived MSSs on the Vanuatu archipelago. Observed short scale undulations are interpreted as due to local geodynamics. Numéro de notice : A2009-582 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0320-7 En ligne : https://doi.org/10.1007/s00190-009-0320-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88651 [article]

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An absolute calibration site for radar altimeters in the continental domain: Lake Issykkul in Central Asia / J.F. Cretaux in Journal of geodesy, vol 83 n° 8 (August 2009)  

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Horizontal and vertical interseismic velocity fields in the Vanuatu subduction zone from GPS measurements: Evidence for a central Vanuatu locked zone / Nicolas Bergeot in Journal of geophysical research : Solid Earth, Vol 114 n° B6 (June 2009)    

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Interseismic and coseismic motions in GPS series related to the Ms 7.3 July 13, 1994, Malekula Earthquake, Central New Hebrides Subduction Zone / Stéphane Calmant in Geophysical research letters, vol 24 n° 23 (December 1997)  

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Le programme DERIV - installation des stations permanentes / Didier Maillard (1997)

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Détermination par GPS des sites Obao et Tran de l'île longue (Chesterfield) / Pierre Lebellegard (1996)

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Rattachement des balises Doris de localisation de Lifou et Tanna aux sites GPS du réseau GSLNH [Géodésie Spatiale Loyauté / Didier Maillard (1996)

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Geodetic measurements of convergence across the New Hebrides Subduction Zone / Stéphane Calmant in Geophysical research letters, vol 22 n° 19 (octobre 1995)  

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Comparaison des récepteurs GPS Ashtech Z-XII et Leica SR 299 / Didier Maillard (1995)

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Détermination par GPS des ilots autour de l'île longue (Chesterfield) / Didier Maillard (1995)

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Détermination par GPS du point géodésique de l'île longue (Chesterfield) / Pierre Lebellegard (1994)

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