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Deflections of the vertical from full-tensor and single-instrument gravity gradiometry / Christopher Jekeli in Journal of geodesy, vol 93 n° 3 (March 2019)  

Public [article]  inJournal of geodesy > vol 93 n° 3 (March 2019) . - pp 369 - 382 Titre : Deflections of the vertical from full-tensor and single-instrument gravity gradiometry Type de document : Article/Communication Auteurs : Christopher Jekeli, Auteur Année de publication : 2019 Article en page(s) : pp 369 - 382 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] champ de pesanteur terrestre [Termes IGN] déviation de la verticale [Termes IGN] faille géologique [Termes IGN] gradient de gravitation [Termes IGN] intégration de données [Termes IGN] levé gravimétrique Résumé : (Auteur) Gravity gradiometry on a moving platform, whether ground or airborne, has the potential to offer an efficient and accurate determination of the deflection of the vertical by simple line integration. A significant error in this process is a trend error that results from the integration of systematic gradient errors. Using an airborne full-tensor gradiometry data set of regularly spaced and intersecting tracks over a 10 km square region and the USDOV2012 vertical deflection model to calibrate these long wavelength errors, it is shown that the gradient-derived deflections agree with the USDOV2012 model at the level of 0.6–0.9 arcsec. Moreover, it is shown by graphical inspection that these differences represent high-frequency signal rather than error. Another data processing technique is examined using only (simulated) single-gradiometer instrument data, i.e., the local differential curvature components, (Γyy−Γxx)/2 and Γxy, of the gravity field. While in theory these data can yield deflection components using two parallel data tracks, the results in the tested case are unsatisfactory due to implicit additional cross-track integration errors that accumulate systematically. The analysis thus demonstrates the importance of using the individual horizontal gradient components, Γxx, Γyy, to derive the deflection of the vertical. Numéro de notice : A2019-152 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-018-1162-y Date de publication en ligne : 11/07/2018 En ligne : https://doi.org/10.1007/s00190-018-1162-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92491 [article]

Using gravity and topography-implied anomalies to assess data requirements for precise geoid computation / Christopher Jekeli in Journal of geodesy, vol 83 n° 12 (December 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 12 (December 2009) . - pp 1193 - 1202 Titre : Using gravity and topography-implied anomalies to assess data requirements for precise geoid computation Type de document : Article/Communication Auteurs : Christopher Jekeli, Auteur ; H. Yang, Auteur ; J.H. Kwong, Auteur Année de publication : 2009 Article en page(s) : pp 1193 - 1202 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] cohérence des données [Termes IGN] Corée du sud [Termes IGN] corrélation [Termes IGN] géoïde gravimétrique [Termes IGN] géoïde local [Termes IGN] intégrale de Stokes [Termes IGN] levé gravimétrique [Termes IGN] nivellement par GPS [Termes IGN] pesanteur terrestre [Termes IGN] topographie locale Résumé : (Auteur) Many regions around the world require improved gravimetric data bases to support very accurate geoid modeling for the modernization of height systems using GPS. We present a simple yet effective method to assess gravity data requirements, particularly the necessary resolution, for a desired precision in geoid computation. The approach is based on simulating high-resolution gravimetry using a topography-correlated model that is adjusted to be consistent with an existing network of gravity data. Analysis of these adjusted, simulated data through Stokes’s integral indicates where existing gravity data must be supplemented by new surveys in order to achieve an acceptable level of omission error in the geoid undulation. The simulated model can equally be used to analyze commission error, as well as model error and data inconsistencies to a limited extent. The proposed method is applied to South Korea and shows clearly where existing gravity data are too scarce for precise geoid computation. Copyright Springer Numéro de notice : A2009-478 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0337-y Date de publication en ligne : 20/08/2009 En ligne : https://doi.org/10.1007/s00190-009-0337-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30107 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09111	SL	Revue	Centre de documentation	Revues en salle	Disponible

Gravity gradient modeling using gravity and DEM / L. Zhu in Journal of geodesy, vol 83 n° 6 (June 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 6 (June 2009) . - pp 557 - 567 Titre : Gravity gradient modeling using gravity and DEM Type de document : Article/Communication Auteurs : L. Zhu, Auteur ; Christopher Jekeli, Auteur Année de publication : 2009 Article en page(s) : pp 557 - 567 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] collocation par moindres carrés [Termes IGN] gradient de gravitation [Termes IGN] gravimétrie aérienne [Termes IGN] levé gravimétrique [Termes IGN] modèle de géopotentiel local [Termes IGN] modèle numérique de terrain [Termes IGN] problème des valeurs limites Résumé : (Auteur) A model of the gravity gradient tensor at aircraft altitude is developed from the combination of ground gravity anomaly data and a digital elevation model. The gravity data are processed according to various operational solutions to the boundary-value problem (numerical integration of Stokes’ integral, radial-basis splines, and least-squares collocation). The terrain elevation data are used to reduce free-air anomalies to the geoid and to compute a corresponding indirect effect on the gradients at altitude. We compare the various modeled gradients to airborne gradiometric data and find differences of the order of 10–20 E (SD) for all gradient tensor elements. Our analysis of these differences leads to a conclusion that their source may be primarily measurement error in these particular gradient data. We have thus demonstrated the procedures and the utility of combining ground gravity and elevation data to validate airborne gradiometer systems. Copyright Springer Numéro de notice : A2009-285 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0273-2 En ligne : https://doi.org/10.1007/s00190-008-0273-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29915 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09051	SL	Revue	Centre de documentation	Revues en salle	Disponible

Gravity, geoid and space missions GGSM 2004, IAG international symposium, Porto, Portugal, August 30 - September 3, 2004 / Christopher Jekeli (2005)  

Public Titre : Gravity, geoid and space missions GGSM 2004, IAG international symposium, Porto, Portugal, August 30 - September 3, 2004 Type de document : Actes de congrès Auteurs : Christopher Jekeli, Éditeur scientifique ; Luisa Bastos, Éditeur scientifique ; J. Fernandes, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2005 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 129 Conférence : IAG 2004, GGSM international symposium Gravity, geoid and space missions 30/08/2004 03/09/2004 Porto Portugal Importance : 368 p. Format : 20 x 27 cm ISBN/ISSN/EAN : 978-3-540-26930-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] base de données topographiques [Termes IGN] champ de pesanteur terrestre [Termes IGN] géodynamique [Termes IGN] géoïde local [Termes IGN] géoïde terrestre [Termes IGN] gravimètre [Termes IGN] gravimétrie [Termes IGN] modèle de géopotentiel [Termes IGN] océanographie spatiale [Termes IGN] pesanteur terrestre Résumé : (Documentaliste) Ce document rassemble les communications présentées lors du symposium international de l'Association Internationale de Géodésie qui a eu lieu à Porto, du 30 août au 3 septembre 2004. Neuf sessions ont regroupé les présentations : le modèle de champ de pesanteur d'après des missions satellitaires ; l'instrumentation en gravimétrie aérienne et satellitaire ; la modélisation de geoïde régional ; la cartographie par radar et laser satellitaires ; les bases de données topographiques et la modélisationde pesanteur ; l'altimétrie satellitaire, l'océanographie et le géoïde ; l'instrumentation et les réseaux en gravimétrie terrestre et la géodynamique ; les variations temporelles de pesanteur ; les champs et modèles de pesanteur de planètes. Note de contenu : Session 1: Initial results from retracking and reprocessing the ERS-1 geodetic mission altimetry for gravity field purposes. / O.B. Andersen, P. Knudsen, P. A. M. Berry, E. L. Mathers, R. Trimmer, and S. Kenyan Space-borne gravimetry: determination of the time variable gravity field / P.N.A.M. Visser and E.J.O. Schrama Satellite clusters for future gravity field missions / N. Sneeuw and H.P. Schaub A Preliminary Gravitational Model to Degree 2160 / N.K. Pavlis, S.A. Holmes, S.C. Kenyan, D. Schmidt, and R. Trimmer Stochastic model validation of satellite gravity data: A test with CHAMP pseudo-observations / J.P. van Loon and J. Kusche Analysis of J2-Perturbed Relative Orbits for Satellite Formation Flying / C. Xu, R. Tsoi and N. Sneeuw GOCE Gravity Field Processing / R. Pail, W.-D. Schuh andM. Wermuth GRACE Gradiometer / MA. Sharifi and W. Keller Modelling the Earth's gravity field using wavelet frames / l. Panet, O. Jamet, M. Diament and A. Chambodut Numerical Velocity Determination and Calibration Methods for CHAMP Using the Energy Balance Approach / M. Weigelt and N. Sneeuw Upward Continuation of Ground Data for GOCE Calibration/Validation Purposes / K.I. Wolf and H. Denker Global Gravity Field Solutions Based on a Simulation Scenario of GRACE SST Data and Regional Refinements by GOCE SGG Observations / A. Bicker, T. Mayer-Guerr and K.H. Ilk Effect of geopotential model errors on the projection of GOCE gradiometer observables / Gy. Toth and L. Foldvary Comparison of some robust parameter estimation techniques for outlier analysis applied to simulated GOCE mission data / B. Kargoll Comparison of outlier detection algorithms for GOCE gravity gradients / J. Bouman, M. Kern, R. Koop, R. Pail, R. Haagmans and T. Preimesberger Using the EIGEN-GRACE02S Gravity Field to Investigate Defectiveness of Marine Gravity Data / Wolfgang Bosch Determination of gravity gradients from terrestrial gravity data for calibration and validation of gradiometric GOCE data / M. Kern and R. Haagmans Session 2: Evaluation of Airborne Gravimetry Integrating GNSS and Strapdown INS Observations / Ch. Kreye, G. W. Hein and B. Zimmermann Network Approach versus State-space Approach for Strapdown Inertial Kinematic Gravimetry / A. Termens and I. Colomina The Airborne Gravimeter CHEKAN-A at the Institute of Flight Guidance (IFF) / T. H. Stelkens-Kobsch Numerical investigation of downward continuation methods for airborne gravity data / I.N. Tziavos, V.D. Andritsanos, R. Forsberg andA.V. Olesen Session 3: Status of the European Gravity and GeoidProject EGGP / H. Denker, J.-P. Barriot, R. Barzaghi, R. Forsberg, J. Ihde, A. Kenyeres, U. Marti, I.N. Tziavos Merging a Gravimetric Model of the Geoid withGPS/Leveiling data : an Example in Belgium / H. Duquenne, M. Everaerts and P. Lambot The Antarctic Geoid Project: Status Report and Next Activities / Mirko Scheinert First Results from new High-precision Measurements of Deflections of the Vertical in Switzerland / A. Mutter, B. Burki, H.-G. Kahle, Ch. Hirt and U. Marti Error Propagation with Geographic Specificity for Very High Degree Geopotential Models / N.K. Pavlis andJ. Saleh Gravity Data Base Generation and Geoid Model Estimation Using Heterogeneous Data / G.S. Vergos, I.N. Tziavos and V.D. Andritsanos A new strategy for processing airborne gravity data / B.A. Alberts, R. Klees and P. Ditmar Multiresolution representation of a regional geoid from satellite and terrestrial gravity data / M. Schmidt, J. Kusche, J.P. van Loon, C.K. Shum, S.-C. Han and O. Fabert A Study on Two-boundary Problems in Airborne Gravimetry and Satellite Gradiometry / P. Holota and M. Kern Local Geoid Computation by the Spectral Combination Method / O. Gitlein, H. Denker and J. Muller On the incorporation of sea surface topography in establishing vertical control / G. Fotopoulos, I.N. Tziavos and M.G. Sideris A New Gravimetric Geoidal Height Model over Norway Computed by the Least-Squares Modification Parameters / H. Nahavandchi, A. Soltanpour and E. Nyrnes On the Accuracy of Vertical Deflection Measurements Using the High-Precision Digital Zenith Camera System TZK2-D / Ch. Hirt, B. Reese and H. Enslin TERRA: A feasibility study on local geoid determination in Bolivia with strapdown inertial airborne gravimetry / M. Gimenez, I. Colomina, J. J. Resales, M. Wis, C. C. Tscherning and E. Vdsquez Artificial Neural Network: A Powerful Tool for Predicting Gravity Anomaly from Sparse Data / A.R. Tierra and S.R.C. de Freitas Session 4: Photon Counting Airborne Laser Swath Mapping(PC-ALSM) / W. E. Carter, R. L. Shrestha, and K.C. Slatton Evaluation of SRTM3 and GTOPO30 Terrain Data in Germany / H. Denker Multiscale Estimation of Terrain Complexity Using ALSM Point Data on Variable Resolution Grids / K.C. Slatton, K. Nagarajan, V. Aggarwal, H. Lee, W. Carter and R. Shrestha Session 5: A comparison of different isostatic models applied to satellite gravity gradiometry / F. Wild and B. Heck Session 6: Spectral Analysis of Mean Dynamic Ocean Topography From the GRACE GGM01 Geoid / Z. Zhang and Y. Lu Interannual to decadal sea level change in south-western Europe from satellite altimetry and in-situ measurements / L. Fenoglio-Marc, E. Tel, M.J. Garcia and N. Kjaer Spacetime analysis of sea level in the North Atlantic from TOPEX/Poseidon satellite altimetry / S.M, Barbosa, M. J. Fernandes and M. E. Silva Mean Sea Level and Sea Level Variation Studies in the Black Sea and the Aegean / I.N. Tziavos, G.S. Vergos, V. Kotzev and L. Pashova Modelling Future Sea-level Change under Greenhouse Warming Scenarios with an Earth System Model of Intermediate Complexity / 0. Makarynskyy, M. Kuhn and W.E. Featherstone Crossover Adjustment of New Zealand Marine Gravity Data, and Comparisons with Satellite Altimetry and Global Geopotential Models / M.J. Amos, W.E. Featherstone and J. Brett Session 7: Results of the International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003 / Olivier Francis, Tonie van Dam, M. Amalvict, M. Andrade de Sousa, M. Bilker, R. Billson, G. D'Agostino, S. Desogus, R. Falk, A. Germak, O. Gitlein, D. Jonhson, F. KloppingJ. Kostelecky, B. Luck, J. Makinen, D. McLaughlin, E. Nunez, C. Origlia, V.Palinkas,P. Richard, E. Rodriguez, D. Ruess, D. Schmerge, S. Thies, L. Timmen, M. Van Camp, D. van Westrum and H. Wilmes A New Small Cam-Driven Absolute Gravimeter / J.E. Fatter and A.L. Vitouchkine Absolute Gravity Measurements in Australia and Syowa Station, Antarctica / Y. Fukuda, T. Higashi, S. Takemoto, S. Iwano, K. Dot, K. Shibuya, Y. Hiraoka, I. Kimura, H. McQueen and R. Govind Unified European Gravity Reference Network 2002 (UEGN02) - Status 2004 / G. Boedecker, O. Francis and A. Kenyeres Determination of gravity anomalies from torsion balance measurements / L. Volgyesi, G. Toth and G. Csapo Session 8: Decadal Ocean Bottom Pressure Variability and its Associated Gravitational Effects in a Coupled Ocean-Atmosphere Model / R.J. Bingham and K. Haines Gravity Changes in the Fennoscandian Uplift Area to be Observed by GRACE and Absolute Gravimetry / J. Mutter, L. Timmen, O. Gitlein and H. Denker Recovery of global time-variations of surface water mass by GRACE geoid inversion / G. Ramillien, A. Cazenave, Ch. Reigber, R. Schmidt and P. Sckwintzer Seasonal Gravity Field Variations from GRACE and Hydrological Models / O.B. Andersen, J. Hinderer, F. G. Lemoine Mass redistribution from global GPS timeseries and GRACE gravity fields: inversion issues / J. Kusche and E.J.O. Schrama The Fennoscandian Land Uplift Gravity Lines 1966-2003 / J Makinen, A. Engfeldt, B.C. Harsson, H. Ruotsalainen, G. Strykowski, T. Oja, D. Wolf Temporal Gravity Variations in GOCE Gradiometric Data / F. Jarecki, J. Mutter, S. Petrovic and P. Schwintzer Estimating GRACE Aliasing Errors / K.-W. Seo and C.R. Wilson Methods to Study Co-seismic Deformations Detectable by Satellite Gravity Mission GRACE / W. Sun and S. Okubo The gradiometric-geodynamic boundary value problem / Gy. Toth Relation between the geological conditions and vertical surface movements in the Pannonian basin / L. Volgyesi, G. Csapo and Z. Szabo Modelling gravity gradient variation due to water mass fluctuations / L. Volgyesi and G. Toth Numéro de notice : 13811 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : 10.1007/b138327 En ligne : https://doi.org/10.1007/b138327 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34646

Contient

• Merging a gravimetric model of the geoid with GPS-leveling data: an example in Belgium / Henri Duquenne (01/08/2004)  
• Modelling the Earth’s gravity field using wavelet frames / Isabelle Panet (2005)  

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13811-01	CG2004	Livre	Centre de documentation	Congrès	Disponible

An investigation of two models for the degree variances of global covariance functions / Christopher Jekeli (1978)

Public Titre : An investigation of two models for the degree variances of global covariance functions Type de document : Rapport Auteurs : Christopher Jekeli, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1978 Collection : Reports of the Department of Geodetic Science num. 275 Importance : 72 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] champ de pesanteur terrestre [Termes IGN] compensation par moindres carrés [Termes IGN] covariance [Termes IGN] variance Index. décimale : 30.40 Géodésie physique Numéro de notice : 45002 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport de recherche Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58263

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
45002-01	30.40	Livre	Centre de documentation	Géodésie	Disponible