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DORIS, 30 ans d'opérations continues au coeur de la performance des missions altimétriques pour l'océanographie et les applications géodésiques / Anonyme in XYZ, n° 163 (juin 2020)

Public [article]  inXYZ > n° 163 (juin 2020) . - pp 20 - 20 Titre : DORIS, 30 ans d'opérations continues au coeur de la performance des missions altimétriques pour l'océanographie et les applications géodésiques Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2020 Article en page(s) : pp 20 - 20 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] océanographie spatiale [Termes IGN] Poseidon [Termes IGN] positionnement par DORIS [Termes IGN] précision du positionnement [Termes IGN] réseau Doris [Termes IGN] SWOT [Termes IGN] TOPEX Résumé : (Auteur) Le système DORIS (Détermination d'Orbite et Radio positionnement Intégrés par Satellite) a été conçu et développé au début des années 80 par le CNES, l'IGN et le GRGS pour déterminer les positions des satellites avec une grande précision afin de soutenir les missions altimétriques dédiées à la surveillance des océans. Numéro de notice : A2020-387 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtSansCL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95482 [article]

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112-2020021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Determination of gridded mean sea surface from Topex, ERS-1 and Geosat altimeter data / Y. Yi (1995)

Public Titre : Determination of gridded mean sea surface from Topex, ERS-1 and Geosat altimeter data Type de document : Monographie Auteurs : Y. Yi, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1995 Collection : Department of Geodetic Science and Surveying Reports num. 434 Importance : 93 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ERS [Termes IGN] GEOSAT [Termes IGN] hauteurs de mer [Termes IGN] modélisation [Termes IGN] niveau moyen des mers [Termes IGN] TOPEX Index. décimale : 30.52 Marégraphie et niveau moyen des mers Résumé : (Auteur) A mean sea surface (MSS) grid model on a 1°/16 grid was developed using one year mean sea surface height (SSH) data of the Topex, Geosat and 35-day repeat ERS-1 altimeter satellites. The first cycle data of 168-day repeat ERS-1 were also included. The MSS data represent average heights of the ocean surface above the Topex/Poseidon reference ellipsoid during Topex repeat cycles 17 through 53. The one year mean SSH data of each satellite were computed by time-averaging SSH values of all available cycles at fixed points on the reference track. The inverted barometer (IB) correction had been applied to all SSH data before they were reduced to reference tracks correcting for the geoid gradients. The ocean tide correction of the Topex SSH data used in this study had been improved over the Cartwright and Ray 1990 model in a preliminary analysis which estimated residual signals of four major ocean tide constituents along with additional modeling of the annual and semiannual variations and the global secular SSH change. As a by-product of this preliminary data analysis, a sea level rise rate of 2.3 mm/yr. was obtained from Topex SSH data for cycles 4 through 58 after correcting for the drift rate of Topex altimeter. A gridding method of the least squares collocation was used with a covariance function based on the second-order Markov process. Global test comparisons of several recently developed MSS grid models showed that the MSS model determined in this study had the best agreement with the SSH and along-track SSH gradient data of Topex, Geosat and ERS-1 satellites. The MSS grid model determined in this study, however, contains the artifact of cross-track gradients which show the visual pattern of satellite ground tracks in regions with strong ocean variability. The artificial cross-track gradients of this MSS model can create errors of about 0.2 - 0.3 cm of MSS gradient correction for the ocean-wide Topex data. Another version of the MSS model corresponding to the SSH data without the IB correction was also produced but it was found that the MSS model with the IB correction is preferred. Numéro de notice : 12107 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54536

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12107-01	30.52	Livre	Centre de documentation	Géodésie	Disponible

DORIS and IERS terrestrial reference frame : open questions and comments / Pascal Willis (1995)

Public Titre : DORIS and IERS terrestrial reference frame : open questions and comments Type de document : Article/Communication Auteurs : Pascal Willis , Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1995 Collection : Publications du LAREG Sous-collection : Communications Conférence : ITRF 1995, workshop 08/05/1995 09/05/1995 Saint-Mandé France Importance : 14 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] DORIS [Termes IGN] International Terrestrial Reference Frame [Termes IGN] système de référence géodésique [Termes IGN] TOPEX Index. décimale : 30.10 Systèmes de référence et réseaux géodésiques Numéro de notice : 12305 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64257

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12305-01	30.10	Tiré à part	Centre de documentation	Géodésie	Disponible
12305-02	30.10	Tiré à part	Centre de documentation	Géodésie	Disponible

La gestion des données en sciences de la Terre et de l'environnement / Centre national d'études spatiales (1995)

Public Titre : La gestion des données en sciences de la Terre et de l'environnement Type de document : Actes de congrès Auteurs : Centre national d'études spatiales, Auteur Editeur : Paris, Toulouse, Kourou [France] : Centre National d'Etudes Spatiales CNES Année de publication : 1995 Conférence : CNES 1995, La gestion des données en sciences de la Terre et de l'environnement 02/06/1995 02/06/1995 Toulouse France Importance : 250 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] altimétrie [Termes IGN] atmosphère terrestre [Termes IGN] AVISO [Termes IGN] environnement [Termes IGN] Poseidon [Termes IGN] positionnement par GPS [Termes IGN] sciences de la Terre et de l'univers [Termes IGN] TOPEX Numéro de notice : 68709 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=37212

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68709-01	CG.95	Livre	Centre de documentation	Congrès	Disponible

Estimation of sea dynamic topography, ocean tides, and secular changes from Topex altimeter data / Y.M. Wang (1994)

Public Titre : Estimation of sea dynamic topography, ocean tides, and secular changes from Topex altimeter data Type de document : Monographie Auteurs : Y.M. Wang, Auteur ; R.H. Rapp, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1994 Collection : Department of Geodetic Science and Surveying Reports num. 430 Importance : 86 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] données altimétriques [Termes IGN] fonction harmonique [Termes IGN] harmonique sphérique [Termes IGN] hauteurs de mer [Termes IGN] marée océanique [Termes IGN] perturbation séculaire [Termes IGN] TOPEX [Termes IGN] valeur efficace Index. décimale : 30.52 Marégraphie et niveau moyen des mers Résumé : (Auteur) Sea surface dynamic topography (SSDT) has been determined from the separation of the Topex sea surface height and the geoid undulations implied by the JGM-2/OSU91A merged potential coefficient model. The SSDT was initially analyzed to determine annual and semiannual variations in the ocean surface, corrections to the M2, S2, K1, 01 constituents of the Cartwright/Ray tide model, and bias and bias rate terms. All correction terms were represented by spherical series to degree 8 (for most testing purposes) and to degree 15 for final runs. The most complete analysis was done with Topex cycles 4 to 58. From this solution we found that the root mean square annual signal was ±4.5 cm in the Northern Hemisphere and ±3.5 cm in the Southern Hemisphere with an overall amplitude of ±4.0 cm. Large 'annual signals were associated with features such as the Kurishio Current (±10 cm), Gulf Stream (±7 cm) and the Falkland Current (±6 cm). The tide correction terms were ±2.9 CM (MA ±1.5 CM (S2), +0.8 CM (01), ±1.4 cm. (K1). The improvement in the tide model was proven through comparisons at the 104/95 tide gauge data set provided by C. Le Provost. The bias rate value was determined at each normal point and then averaged to determine a mean rate of 4.8 mm/yr. - After removing an altimeter drift rate of 2.0 mm/yr the net rate is 2.8 mm/yr., This rate could be a combination of sea level change and effects associated with the various correction terms applied to the data. The second main theme of the report relates to the representation of SSDT in spherical harmonics (SH) and orthonormal (ON) functions. Procedures were implemented to estimate either SH or ON coefficients. It was found that the estimation of SH coefficients was more stable than the ON estimation. For those applications on which spectral information of SSDT is needed a SH model can be transformed into an ON model. It was found that the lower degree SH coefficients are quite sensitive to the -bias correction applied to the sea surface height data. This sensitivity does not occur in ON coefficient estimation. For the analysis with data from cycles 4 to 58 a bias term of 55 cm. was applied to the data. This value leads to a zero value for the degree zero term in the ON expansion. An SH expansion to degree 24 was computed using a priori degree variance computed from 10 selected cycles of Topex data. The SH expansion was transformed to an ON expansion and both coefficient sets are given in the report. The degree 2,0 coefficient in the SH representation was -37.8 cm quite comparable with other altimeter based solutions. The analysis of the ON coefficient indicated an rms value of SSDT equal to ±61 cm. The ON- power spectrum, in conjunction with the geoid undulation accuracy of the JGM-2 model in the ocean areas, indicated the two values are approximately equal near degree 13. This suggests that SSDT estimates above degree 13 may be unreliable. This statement was consistent with the inconsistency of geostrophic flow patterns implied, by the SSDT expansions at the higher degrees. Even at the lower (e.g. 13) degree the flow patterns showed only moderate agreement with known circulation patterns. Numéro de notice : 12110 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54539

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
12110-01	30.52	Livre	Centre de documentation	Géodésie	Disponible

Joint IAPSO-IOC workshop on sea level measurements and quality control / Intergovernmental oceanographic commission (1992)

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

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