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Optima multi-step collocation: application to the space-wise approach for GOCE data analysis / M. Reguzzoni in Journal of geodesy, vol 83 n° 1 (January 2009)
[article]
Titre : Optima multi-step collocation: application to the space-wise approach for GOCE data analysis Type de document : Article/Communication Auteurs : M. Reguzzoni, Auteur ; N. Tselfes, Auteur Année de publication : 2009 Article en page(s) : pp 13 - 29 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse harmonique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] coefficient de géopotentiel
[Termes IGN] collocation
[Termes IGN] GOCE
[Termes IGN] harmonique sphérique
[Termes IGN] levé gravimétriqueRésumé : (Auteur) Collocation is widely used in physical geodesy. Its application requires to solve systems with a dimension equal to the number of observations, causing numerical problems when many observations are available. To overcome this drawback, tailored step-wise techniques are usually applied. An example of these step-wise techniques is the space-wise approach to the GOCE mission data processing. The original idea of this approach was to implement a two-step procedure, which consists of first predicting gridded values at satellite altitude by collocation and then deriving the geo-potential spherical harmonic coefficients by numerical integration. The idea was generalized to a multi-step iterative procedure by introducing a time-wise Wiener filter to reduce the highly correlated observation noise. Recent studies have shown how to optimize the original two-step procedure, while the theoretical optimization of the full multi-step procedure is investigated in this work. An iterative operator is derived so that the final estimated spherical harmonic coefficients are optimal with respect to the Wiener–Kolmogorov principle, as if they were estimated by a direct collocation. The logical scheme used to derive this optimal operator can be applied not only in the case of the space-wise approach but, in general, for any case of step-wise collocation. Several numerical tests based on simulated realistic GOCE data are performed. The results show that adding a pre-processing time-wise filter to the two-step procedure of data gridding and spherical harmonic analysis is useful, in the sense that the accuracy of the estimated geo-potential coefficients is improved. This happens because, in its practical implementation, the gridding is made by collocation over local patches of data, while the observation noise has a time-correlation so long that it cannot be treated inside the patch size. Therefore, the multi-step operator, which is in theory equivalent to the two-step operator and to the direct collocation, is in practice superior thanks to the time-wise filter that reduces the noise correlation before the gridding. The criteria for the choice of this filter are investigated numerically. Copyright Springer Numéro de notice : A2009-179 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0225-x En ligne : https://doi.org/10.1007/s00190-008-0225-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29809
in Journal of geodesy > vol 83 n° 1 (January 2009) . - pp 13 - 29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09011 RAB Revue Centre de documentation En réserve L003 Disponible 266-09012 RAB Revue Centre de documentation En réserve L003 Disponible A study reference frame consistency in recent Earth gravitational models / Christopher Kotsakis in Journal of geodesy, vol 83 n° 1 (January 2009)
[article]
Titre : A study reference frame consistency in recent Earth gravitational models Type de document : Article/Communication Auteurs : Christopher Kotsakis, Auteur Année de publication : 2009 Article en page(s) : pp 31 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] cohérence des données
[Termes IGN] Earth Gravity Model 2008
[Termes IGN] GRACE
[Termes IGN] harmonique sphérique
[Termes IGN] levé gravimétrique
[Termes IGN] modèle de géopotentiel
[Termes IGN] repère de référenceRésumé : (Auteur) All gravity field functionals obtained from an Earth gravitational model (EGM) depend on the underlying terrestrial reference frame (TRF), with respect to which the EGM’s spherical harmonic coefficients refer to. In order to maintain a coherent framework for the comparison of current and future EGMs, it is thus important to investigate the consistency of their inherent TRFs, especially when their use is intended for high precision studies. Following the methodology described in an earlier paper by Kleusberg (1980), the similarity transformation parameters between the associated reference frames for several EGMs (including the most recent CHAMP/GRACE models at the time of writing this paper) are estimated in the present study. Specifically, the differences between the spherical harmonic coefficients for various pairs of EGMs are parameterized through a 3D-similarity spatial transformation model that relates their underlying TRFs. From the least-squares adjustment of such a parametric model, the origin, orientation and scale stability between the EGMs’ reference frames can be identified by estimating their corresponding translation, rotation and scale factor parameters. Various aspects of the estimation procedure and its results are highlighted in the paper, including data weighting schemes, the sensitivity of the results with respect to the selected harmonic spectral band, the correlation structure and precision level of the estimated transformation parameters, the effect of the estimated differences of the EGMs’ reference frames on their height anomaly signal, and the overall feasibility of Kleusberg’s formulae for the assessment of TRF inconsistencies among global geopotential models. Copyright Springer Numéro de notice : A2009-180 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0227-8 En ligne : https://doi.org/10.1007/s00190-008-0227-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29810
in Journal of geodesy > vol 83 n° 1 (January 2009) . - pp 31 - 50[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09011 RAB Revue Centre de documentation En réserve L003 Disponible 266-09012 RAB Revue Centre de documentation En réserve L003 Disponible Terrasar-X1M spaceborne radar / M. Weber in GIM international, vol 23 n° 1 (January 2009)
[article]
Titre : Terrasar-X1M spaceborne radar Type de document : Article/Communication Auteurs : M. Weber, Auteur ; F. Koudogho, Auteur Année de publication : 2009 Article en page(s) : pp 12 - 15 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] image à résolution métrique
[Termes IGN] image radar
[Termes IGN] image TerraSAR-X
[Termes IGN] mode spotlight
[Termes IGN] radar à antenne synthétique
[Termes IGN] TerraSAR-XRésumé : (Auteur) Data from high-resolution radar space sensors is increasingly used for commercial applications. Introduced here are specially designed commercial features and products from the new TerraSAR-X satellite. Also discussed is its forthcoming ‘twin' TanDEM-X. Copyright Reed Business Numéro de notice : A2009-045 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29675
in GIM international > vol 23 n° 1 (January 2009) . - pp 12 - 15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-09011 RAB Revue Centre de documentation En réserve L003 Disponible The international Doris service, IDS activity report, January 2006 - December 2008 / Pierre Tavernier (2009)
Titre : The international Doris service, IDS activity report, January 2006 - December 2008 Type de document : Rapport Auteurs : Pierre Tavernier, Auteur ; Pascale Ferrage, Auteur ; International Doris Service, Auteur ; Hervé Fagard, Auteur ; et al., Auteur Editeur : Paris, Toulouse, Kourou [France] : Centre National d'Etudes Spatiales CNES Année de publication : 2009 Importance : 91 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] altimètre
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] réseau Doris
[Termes IGN] station DORISNote de contenu : IDS AND DORIS QUICK REFERENCE LIST
GLOSSARY.
1 INTRODUCTION.
2 DORIS SPECIAL ISSUE IN JOURNAL OF GEODESY.
3 HISTORY.
4 ORGANIZATION.
5 THE CENTRAL BUREAU: IDS INFORMATION SYSTEM.
5.1 WHAT AND WHERE
5.2 WEB AND FTP SITES
5.2.1 IDS WEB SITE5.2.2 IDS FTP SERVER
5.2.3 DORIS WEB SITE
5.2.4 DATA CENTERS' WEB SITES
5.3 THE MAIL SYSTEM
5.3.1 DORISMAIL.
5.3.2 DORISREPORT
5.3.3 IDS ANALYSIS FORUM
5.3.4 OTHER MAILING LISTS
5.4 HELP TO THE USERS
5.5 FUTURE PLAN
6 THE NETWORK
6.1 GENERAL STATUS OF THE NETWORK.
6.2 RENOVATION PROGRAM OF THE PERMANENT NETWORK.
6.3 THIRD GENERATION BEACONS DEPLOYMENT STATUS
6.4 CO-LOCATIONS WITH OTHER IERS TECHNIQUES
7 THE SATELLITES FITTED OUT WITH DORIS RECEIVERS
IDS DATA FLOW COORDINATION (2006-2008)..
7.1 INTRODUCTION
7.2 FLOW OF IDS DATA AND PRODUCTS
7.3 DORIS DATA.
7.4 DORIS PRODUCTS
7.5 FUTURE PLANS
8 IDS DATA CENTERS
8.1 CRUSTAL DYNAMICS DATA INFORMATION SYSTEM (CDDIS)
8.1.1 PRESENTATION
8.1.2 CDDIS FUTURE PLANS
8.1.3 CDDIS CONTACT
8.2 IGN DORIS DATA CENTER
9 IDS ANALYSIS COORDINATION
9.1 ANALYSIS COORDINATION
9.2 ORBIT TESTS: RESULTS OF PRELIMINARY ORBIT COMPARISONS
9.3 SINEX FILE VALIDATION
9.4 ANALYSIS CENTERS STATUS AS OF DECEMBER 2008
10IDS COMBINATION
10.1 ACTIVITY SUMMARY
10.2 IDS VALIDATION OF SINEX
10.3 CONTRIBUTION TO ITRF2008
10.4 JASON-2
10.5 FUTURE COMBINATIONS
11 REPORT OF THE ESA/ESOC ANALYSIS CENTER (ESA)
11.1 INTRODUCTION
11.2 ITRF-2008 ACTIVITIES
11.3 FUTURE ACTIVITIES
12 REPORT OF THE GEOSCIENCE AUSTRALIA ANALYSIS CENTER (GAU)
12.1 INTRODUCTION
12.2 DATA PROCESSING
12.3 ORBIT COMPARISON TESTS
12.4 SINEX SUBMISSIONS
12.5 BENCHMARK TESTS
13 REPORT OF THE GEODETICAL OBSERVATORY PECNY ANALYSIS CENTER (GOP)
13.1 INTRODUCTION
13.2 ANALYSIS STRATEGY AND MODELS
13.3 AUTOMATION...
13.4 RESULTS AND PRODUCTS..
14 REPORT OF THE NASA/GSFC ANALYSIS CENTER (GSC)
14.1 ITRF2005 & SAA MODEL TESTING AND VALIDATION
14.2 MODEL IMPROVEMENTS FOR ALTIMETER SATELLITE POD
14.3 DEFINITION OF AN OPTIMAL ANALYSIS STRATEGY FOR DORIS PROCESSING
14.4 OTHER ANALYSIS CENTER ACTIVITIES IN 2008.
15 REPORT OF THE IGN/JPL ANALYSIS CENTER (IGN).
15.1 CONTEXT.
15.2 PRODUCTS DELIVERED (2006-2008)..
15.3 MAJOR IMPROVEMENTS.
16REPORT OF THE INASAN ANALYSIS CENTER (INA)
16.1 INTRODUCTION.
16.2 PRODUCT AND ANALYSIS RESULTS DESCRIPTIONS.
17REPORT OF THE CNES/CLS ANALYSIS CENTER (LCA).
17.1 CONTEXT
17.2 DATA PROCESSING.
17.3 PRODUCTS DELIVERED TO IDS....
17.3.1 WEEKLY SINEX
17.3.2 WEEKLY COORDINATE TIME SERIES.
17.3.3 ORBITS..
18 REPORT OF THE NEWCASTLE UNIVERSITY ANALYSIS CENTER (NCL).
19REFERENCES
20PUBLICATIONS (2006-2008)
APPENDIX: DORIS STATIONS COLOCATION WITH TIDE GAUGES.Numéro de notice : 15455 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Rapport d'activité En ligne : http://ids-doris.org/documents/report/IDS_Report_2006_2008.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40693 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15455-01 RO.08 Livre Centre de documentation En réserve M-103 Disponible Validation of geographic data for GMES using national reference data: some feedback on urban atlas and DEM / Jean-Philippe Cantou (2009)
contenu dans International workshop on validation of geo-information products for crisis management, Valgeo 2009, 23- 25 November 2009, Ispra, Italy / Christina Corbane (2009)
Titre : Validation of geographic data for GMES using national reference data: some feedback on urban atlas and DEM Type de document : Article/Communication Auteurs : Jean-Philippe Cantou , Auteur Editeur : Luxembourg : Office des Publications de l'Union Européenne Année de publication : 2009 Conférence : ValGeo 2009, International workshop on validation of geo-information products for crisis management 23/11/2009 25/11/2009 Ispra Italie OA proceedings Importance : pp 23 - 25 Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] atlas numérique
[Termes IGN] Copernicus (programme européen)
[Termes IGN] GeoView
[Termes IGN] modèle numérique de surface
[Termes IGN] validation des donnéesNuméro de notice : C2009-024 Affiliation des auteurs : IGN (1940-2011) Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90139 Documents numériques
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