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Geoid and high resolution sea surface topography modelling in the mediterranean from gravimetry, altimetry and GOCE data: evaluation by simulation / R. Barzaghi in Journal of geodesy, vol 83 n° 8 (August 2009)
[article]
Titre : Geoid and high resolution sea surface topography modelling in the mediterranean from gravimetry, altimetry and GOCE data: evaluation by simulation Type de document : Article/Communication Auteurs : R. Barzaghi, Auteur ; N. Tselfes, Auteur ; I.N. Tziavos, Auteur ; G. Vergos, Auteur Année de publication : 2009 Article en page(s) : pp 751 - 772 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] données altimétriques
[Termes IGN] données GOCE
[Termes IGN] géoïde local
[Termes IGN] hauteurs de mer
[Termes IGN] levé gravimétrique
[Termes IGN] Méditerranée, mer
[Termes IGN] surface de la merRésumé : (Auteur) The determination of local geoid models has traditionally been carried out on land and at sea using gravity anomaly and satellite altimetry data, while it will be aided by the data expected from satellite missions such as those from the Gravity field and steady-state ocean circulation explorer (GOCE). To assess the performance of heterogeneous data combination to local geoid determination, simulated data for the central Mediterranean Sea are analyzed. These data include marine and land gravity anomalies, altimetric sea surface heights, and GOCE observations processed with the space-wise approach. A spectral analysis of the aforementioned data shows their complementary character. GOCE data cover long wavelengths and account for the lack of such information from gravity anomalies. This is exploited for the estimation of local covariance function models, where it is seen that models computed with GOCE data and gravity anomaly empirical covariance functions perform better than models computed without GOCE data. The geoid is estimated by different data combinations and the results show that GOCE data improve the solutions for areas covered poorly with other data types, while also accounting for any long wavelength errors of the adopted reference model that exist even when the ground gravity data are dense. At sea, the altimetric data provide the dominant geoid information. However, the geoid accuracy is sensitive to orbit calibration errors and unmodeled sea surface topography (SST) effects. If such effects are present, the combination of GOCE and gravity anomaly data can improve the geoid accuracy. The present work also presents results from simulations for the recovery of the stationary SST, which show that the combination of geoid heights obtained from a spherical harmonic geopotential model derived from GOCE with satellite altimetry data can provide SST models with some centimeters of error. However, combining data from GOCE with gravity anomalies in a collocation approach can result in the estimation of a higher resolution geoid, more suitable for high resolution mean dynamic SST modeling. Such simulations can be performed toward the development and evaluation of SST recovery methods. Copyright Springer Numéro de notice : A2009-325 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0292-z En ligne : https://doi.org/10.1007/s00190-008-0292-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29955
in Journal of geodesy > vol 83 n° 8 (August 2009) . - pp 751 - 772[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-09071 SL Revue Centre de documentation Revues en salle Disponible Mean dynamic topography and geostrophic surface currents in the Fram Strait derived from geodetic data / D. Lysaker in Marine geodesy, vol 32 n° 1 (January - March 2009)
[article]
Titre : Mean dynamic topography and geostrophic surface currents in the Fram Strait derived from geodetic data Type de document : Article/Communication Auteurs : D. Lysaker, Auteur Année de publication : 2009 Article en page(s) : pp 42 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] anomalie de pesanteur
[Termes IGN] circulation géostrophique
[Termes IGN] collocation par moindres carrés
[Termes IGN] Groenland
[Termes IGN] océanographie dynamique
[Termes IGN] surface de la mer
[Termes IGN] SvalbardRésumé : (Auteur) Two mean dynamic topography (MDT) fields are determined in the Fram Strait between Svalbard and Greenland. New airborne gravity anomalies, older data, and two different mean sea surface (MSS) fields are combined using the least squares collocation (LSC) technique. The results are compared to an oceanographic MDT model and two synthetic MDT fields. The same main currents are seen in all fields. Additionally, smaller scale features are revealed in the new MDT fields. Geostrophic surface currents derived from the MDT models are compared to moorings and Lagrangian drifters. The agreement is desultory. The oceanographic data are an inadequate basis of comparison due to data gaps. Nevertheless, it is the only one available. Copyright Taylor & Francis Numéro de notice : A2009-190 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490410802662029 En ligne : https://doi.org/10.1080/01490410802662029 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29820
in Marine geodesy > vol 32 n° 1 (January - March 2009) . - pp 42 - 63[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 230-09011 RAB Revue Centre de documentation En réserve L003 Disponible Sea-surface polarization ratio from Envisat ASAR AP Data / H. Jonhsen in IEEE Transactions on geoscience and remote sensing, vol 46 n° 11 Tome 1 (November 2008)
[article]
Titre : Sea-surface polarization ratio from Envisat ASAR AP Data Type de document : Article/Communication Auteurs : H. Jonhsen, Auteur ; G. Engen, Auteur ; G. Guitton, Auteur Année de publication : 2008 Article en page(s) : pp 3637 - 3646 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] angle d'incidence
[Termes IGN] bande C
[Termes IGN] diffusométrie
[Termes IGN] image Envisat-ASAR
[Termes IGN] modèle de diffusion du rayonnement
[Termes IGN] polarimétrie radar
[Termes IGN] polarisation
[Termes IGN] surface de la mer
[Termes IGN] vent
[Termes IGN] vitesseRésumé : (Auteur) The polarization ratio (VV/HH) of normalized radar cross section over ocean surface is processed from Envisat advanced synthetic aperture radar (ASAR) alternating polarization (AP) data and compared with existing electromagnetic (EM) scattering models. The processing of the AP data is based on LevelO (raw data) product that enables us to accurately compute the contribution from additive noise separately from each burst. This is important in estimating the correct polarization ratio, particularly at higher incidence angles where the relative contribution from noise becomes severe. A recently published EM scattering model, general curvature method (GCM), is extended here to incorporate scattering from breaking waves. The performance of this model with and without breaking waves is compared with AP data and with other models for the polarization ratio. The extended GCM model is furthermore used to assess the performance of wind speed retrieval in HH polarization. The inclusion of wave breaking in the GCM model reduces the polarization ratio standard deviation from 0.64 to 0.50 and the bias from -0.34 to 0.16, as compared to the measured ASAR AP polarization ratio. The best semiempirical model from literature gives 0.51 and 0.63 for the standard deviation and bias, respectively. The difference in performance is shown to be caused by the wind speed dependence not accounted for in the semiempirical model. Validation of the new polarization ratio model in combination with C-band Model Function (CMOD) for wind speed retrieval at HH polarization shows similar performance as at VV polarization. We conclude that the GCM polarization ratio model incorporating wave-breaking effects is found to reproduce well polarization ratio measurements (ASAR AP) versus wind vector and incidence angle. Numéro de notice : A2008-537 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2008.2001061 En ligne : https://doi.org/10.1109/TGRS.2008.2001061 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29607
in IEEE Transactions on geoscience and remote sensing > vol 46 n° 11 Tome 1 (November 2008) . - pp 3637 - 3646[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-08111A RAB Revue Centre de documentation En réserve L003 Disponible vol 46 n° 11 Tome 1 - November 2008 - Special section on meteorology, climate, ionosphere, geodesy and reflections from the ocean surfaces: studies by radio occultation methods (Bulletin de IEEE Transactions on geoscience and remote sensing) / Geoscience and remote sensing society
[n° ou bulletin]
est un bulletin de IEEE Transactions on geoscience and remote sensing / IEEE Geoscience and remote sensing society (Etats-Unis) (1986 -)
Titre : vol 46 n° 11 Tome 1 - November 2008 - Special section on meteorology, climate, ionosphere, geodesy and reflections from the ocean surfaces: studies by radio occultation methods Type de document : Périodique Auteurs : Geoscience and remote sensing society, Auteur Année de publication : 2008 Importance : 250 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection
[Termes IGN] Formosat / COSMIC
[Termes IGN] météorologie
[Termes IGN] radiooccultation
[Termes IGN] réflectance
[Termes IGN] surface de la mer
[Termes IGN] télédétection spatiale
[Termes IGN] traitement d'imageNuméro de notice : 065-0811A Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Numéro de périodique En ligne : http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=4685926&punumber=36 Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=9541 [n° ou bulletin]ContientExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-08111A RAB Revue Centre de documentation En réserve L003 Disponible A wavelet based technique for sea wind extraction from SAR images / S. Zecchetto in IEEE Transactions on geoscience and remote sensing, vol 46 n° 10 Tome 1 (October 2008)
[article]
Titre : A wavelet based technique for sea wind extraction from SAR images Type de document : Article/Communication Auteurs : S. Zecchetto, Auteur ; F. De Biasio, Auteur Année de publication : 2008 Conférence : IGARSS 2007, International Geoscience And Remote Sensing Symposium, sensing and understanding our planet 23/07/2007 27/07/2007 Barcelone Espagne Proceedings IEEE Article en page(s) : pp 2983 - 2989 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] diffusométrie
[Termes IGN] image Envisat-ASAR
[Termes IGN] image ERS-SAR
[Termes IGN] Méditerranée, mer
[Termes IGN] surface de la mer
[Termes IGN] transformation en ondelettes
[Termes IGN] valeur radiométrique
[Termes IGN] vent
[Termes IGN] vitesseRésumé : (Auteur) We present the follow-up of our previously published work, where we described a wavelet-based method to characterize the sea surface backscatter structures in Synthetic Aperture Radar (SAR) images. The method relies on the ability of the 2-D continuous wavelet technique to detect the spatial structure of the Marine Atmospheric Boundary Layer (MABL) and to isolate wind-related cells and features. The analysis of the cells' geometry, molded by the radiometric characteristics of the sea surface, permits the identification of the wind direction inside the cells, due to the along-wind asymmetry of backscatter structures, and thus the computation of the wind speed through standard algorithms. Twenty-one SAR images (ERS-2 and Envisat ASAR Wide Swath) over the Mediterranean Sea have been analyzed, and the results are compared with satellite wind fields. The images cover a range of meteorological conditions from low to moderate winds. Comparison of the SAR-derived wind fields with those provided by satellite scatterometers indicates a good score of success (roughly 70%-80%). The developed methodology, once tested over an adequate number of images to derive statistically reliable results, could be routinely used to enrich SAR images with the wind field as well as to characterize the MABL in terms of size, distribution, and shape of the backscatter cells. Copyright IEEE Numéro de notice : A2008-538 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2008.920967 En ligne : https://doi.org/10.1109/TGRS.2008.920967 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29608
in IEEE Transactions on geoscience and remote sensing > vol 46 n° 10 Tome 1 (October 2008) . - pp 2983 - 2989[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-08101A RAB Revue Centre de documentation En réserve L003 Disponible Tsunami detection by GPS: how ionospheric observations might improve the global warning system / Giovanni Occhipinti in GPS world, vol 19 n° 2 (February 2008)PermalinkSentinel-3, the ocean and medium-resolution land mission for GMES operational services / M. Aguirre in ESA bulletin, n° 131 (August 2007)PermalinkThe 26 December 2004 tsunami measured by satellite altimetry / J. Gower in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)PermalinkStudy of rain events over the South China Sea by synergistic use of multi-sensor satellite and ground-based meteorological data / W. Alpers in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 3 (March 2007)PermalinkNew insights on intraplate volcanism in French Polynesia from wavelet analysis of GRACE, CHAMP, and sea surface data / Isabelle Panet in Journal of geophysical research : Solid Earth, vol 111 n° B9 (September 2006)PermalinkThe effect of E-M wave's attenuation on sea surface reflectivity, emissivity and estimation of sea surface temperature / Q. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 5 (August 2006)PermalinkThe emissivity of foam-covered water surface at L-band: theoretical modelling and experimental results from the frog 2003 field experiment / A. Camps in IEEE Transactions on geoscience and remote sensing, vol 43 n° 5 (May 2005)PermalinkA wavelet-based algorithm to estimate ocean wave parameters from radar images / A. Niedermeier in IEEE Transactions on geoscience and remote sensing, vol 43 n° 2 (February 2005)PermalinkElectromagnetic wave scattering from the sea surface in the presence of wind wave patterns / V. Shrira in International Journal of Remote Sensing IJRS, vol 24 n° 24 (December 2003)PermalinkGlobal structure of marine wind speed variability derived from Topex altimeter data / G. Chen in International Journal of Remote Sensing IJRS, vol 24 n° 24 (December 2003)Permalink