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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]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2011031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The Harvest experiment LIDAR system : Water level measurement device comparison for Jason-1 and Jason-2/OSTM calibration / S. Washburn in Marine geodesy, vol 34 n° 3-4 (July - december 2011)  

Public [article]  inMarine geodesy > vol 34 n° 3-4 (July - december 2011) . - pp 277 - 290 Titre : The Harvest experiment LIDAR system : Water level measurement device comparison for Jason-1 and Jason-2/OSTM calibration Type de document : Article/Communication Auteurs : S. Washburn, Auteur ; Bruce J. Haines, Auteur ; G. Born, Auteur ; C. Fowler, Auteur Année de publication : 2011 Article en page(s) : pp 277 - 290 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] altimétrie satellitaire par laser [Termes IGN] analyse comparative [Termes IGN] données Jason [Termes IGN] données lidar [Termes IGN] étalonnage d'instrument [Termes IGN] hauteurs de mer [Termes IGN] Jason [Termes IGN] Ocean Surface Topography Mission [Termes IGN] océanographie spatiale [Termes IGN] surface de la mer Résumé : (Auteur) In July 2007, a new Light Detection And Ranging (LIDAR)-based water-level measurement system was installed at the Harvest platform with the goals of assessing potential drifts in the primary National Oceanic and Atmospheric Administration (NOAA) water level (bubbler) system and of providing insight on other environmental conditions which may affect the bubbler accuracy. In addition, the LIDAR provides an independent measure of significant wave height (SWH), which has traditionally been derived from nearby buoys (operated by Scripps and NOAA). The open ocean environment of the Harvest Platform has presented significant challenges. Despite these difficult operating conditions, the LIDAR system has shown promise in being able to assess drift in the bubbler as well as the dependencies on SWH and wind speed. However, a longer time series of data and better environmental condition measurements are needed in order to make an assessment of these parameters with the desired accuracy (e.g., drift to better than 1 mm/yr). Numéro de notice : A2011-463 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2011.590114 Date de publication en ligne : 22/08/2011 En ligne : https://doi.org/10.1080/01490419.2011.590114 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31357 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
230-2011031	RAB	Revue	Centre de documentation	En réserve L003	Disponible