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Effects of topographic-isostatic masses on gravitational functionals at the Earth's surface and at airborne and satellite altitudes / A. Makhloof in Journal of geodesy, vol 82 n° 2 (February 2008)
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Titre : Effects of topographic-isostatic masses on gravitational functionals at the Earth's surface and at airborne and satellite altitudes Type de document : Article/Communication Auteurs : A. Makhloof, Auteur ; K.H. Ilk, Auteur Année de publication : 2008 Article en page(s) : pp 93 - 111 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur local
[Termes IGN] force de gravitation
[Termes IGN] gravimétrie aérienne
[Termes IGN] gravimétrie spatiale
[Termes IGN] isostasie
[Termes IGN] pesanteur terrestre
[Termes IGN] reliefRésumé : (Auteur) Topographic–isostatic masses represent an important source of gravity field information, especially in the high-frequency band, even if the detailed mass-density distribution inside the topographic masses is unknown. If this information is used within a remove-restore procedure, then the instability problems in downward continuation of gravity observations from aircraft or satellite altitudes can be reduced. In this article, integral formulae are derived for determination of gravitational effects of topographic–isostatic masses on the first- and second-order derivatives of the gravitational potential for three topographic–isostatic models. The application of these formulas is useful for airborne gravimetry/gradiometry and satellite gravity gradiometry. The formulas are presented in spherical approximation by separating the 3D integration in an analytical integration in the radial direction and 2D integration over the mean sphere. Therefore, spherical volume elements can be considered as being approximated by mass-lines located at the centre of the discretization compartments (the mass of the tesseroid is condensed mathematically along its vertical axis). The errors of this approximation are investigated for the second-order derivatives of the topographic–isostatic gravitational potential in the vicinity of the Earth’s surface. The formulas are then applied to various scenarios of airborne gravimetry/gradiometry and satellite gradiometry. The components of the gravitational vector at aircraft altitudes of 4 and 10 km have been determined, as well as the gravitational tensor components at a satellite altitude of 250 km envisaged for the forthcoming GOCE (gravity field and steady-state ocean-circulation explorer) mission. The numerical computations are based on digital elevation models with a 5-arc-minute resolution for satellite gravity gradiometry and 1-arc-minute resolution for airborne gravity/gradiometry. Copyright Springer Numéro de notice : A2008-044 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0159-8 En ligne : https://doi.org/10.1007/s00190-007-0159-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29039
in Journal of geodesy > vol 82 n° 2 (February 2008) . - pp 93 - 111[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08022 RAB Revue Centre de documentation En réserve L003 Disponible 266-08021 RAB Revue Centre de documentation En réserve L003 Disponible GOCE's measurements of the gravity field and beyond / R. Floberghaben in ESA bulletin, n° 133 (February 2008)
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Titre : GOCE's measurements of the gravity field and beyond Type de document : Article/Communication Auteurs : R. Floberghaben, Auteur ; M. Drinkwater, Auteur ; Roger Haagmans, Auteur ; M. Kern, Auteur Année de publication : 2008 Article en page(s) : pp 24 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] circulation océanique
[Termes IGN] GOCE
[Termes IGN] gradient de gravitation
[Termes IGN] levé gravimétrique
[Termes IGN] niveau moyen des mersRésumé : (Auteur) Ocean circulation, sea level rise and the ocean's role as a regulator of climate are just some of the critical phenomena that can be further studied with the help of GOCE's gravity field products. But how do the spacecraft's measurements become part of this new information source? Copyright European Space Agency Numéro de notice : A2008-125 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin133/bul133d_floberghagen.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29120
in ESA bulletin > n° 133 (February 2008) . - pp 24 - 31[article]Generation of study of high-resolution satellite gravity over the Sumatra earthquake region / Samprit Chatterjee in International Journal of Remote Sensing IJRS, vol 28 n° 13-14 (July 2007)
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Titre : Generation of study of high-resolution satellite gravity over the Sumatra earthquake region Type de document : Article/Communication Auteurs : Samprit Chatterjee, Auteur ; R. Bhattacharyya, Auteur ; T.J. Majumdar, Auteur Année de publication : 2007 Article en page(s) : pp 2915 - 2925 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] anomalie de pesanteur
[Termes IGN] carte gravimétrique
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données altimétriques
[Termes IGN] épicentre
[Termes IGN] gravimétrie spatiale
[Termes IGN] prévention des risques
[Termes IGN] risque naturel
[Termes IGN] séisme
[Termes IGN] Sumatra
[Termes IGN] tectonique des plaquesRésumé : (Auteur) We have utilized satellite altimetry data to generate the very high-resolution gravity anomaly maps to infer subsurface geological structures in the area of the devastating earthquake (and the corresponding tsunami) that struck the Indian Ocean near Sumatra (Indonesia) on 26 December 2004. In the present study, a high-resolution three-dimensional (3D) gravity image has been generated over a part of the eastern Indian offshore encompassing the Sumatran earthquake region apart from Ninety East Ridge, Andaman subduction zone, etc. Four latitudinal (2°, 3°, 4° and 8.6° N) gravity profiles have been generated across the epicentre (3° N/M w 9.0)/aftershock regions (4° N/M w 5.8 and 8.6° N/M w 6.0 and 6.6). A drastic change of gravity anomaly patterns (sim130 mGal) near the epicentre and the aftershock regions could be observed, which are however slowly diminishing further away from the epicentre. This gravitational difference might have been caused by the differences in plate tectonic processes. Minor/major gravitational differences in other areas may be due to the changes in densities of different lithospheric zones/sedimentary layers. Hence, our study further supports the idea that negative gravity and topography anomalies can be used as a predictor for occurrences of large earthquakes in subduction zones. Copyright Taylor & Francis Numéro de notice : A2007-336 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160601091829 En ligne : https://doi.org/10.1080/01431160601091829 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28699
in International Journal of Remote Sensing IJRS > vol 28 n° 13-14 (July 2007) . - pp 2915 - 2925[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-07081 RAB Revue Centre de documentation En réserve L003 Disponible Practical geodesy: part 3 The geoid / Huibert-Jan Lekkerkerk in Geoinformatics, vol 10 n° 4 (01/06/2007)
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Titre : Practical geodesy: part 3 The geoid Type de document : Article/Communication Auteurs : Huibert-Jan Lekkerkerk, Auteur Année de publication : 2007 Article en page(s) : pp 44 - 45 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude normale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] géoïde local
[Termes IGN] géoïde terrestre
[Termes IGN] positionnement par GPS
[Termes IGN] potentiel de pesanteur terrestreRésumé : (Editeur) In the previous articles, we saw that the Earth, considering its shape, could be compared to a potato or, more scientifically, the geoid. It was best approximated by the ellipsoid. But what is the geoid, the definition of which is : "the equipotential surface at mean sea level" ? Numéro de notice : A2007-230 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28593
in Geoinformatics > vol 10 n° 4 (01/06/2007) . - pp 44 - 45[article] Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 262-07041 SL Revue Centre de documentation Revues en salle Disponible The topographic bias by analytical continuation in physical geodesy / Lard Erik Sjöberg in Journal of geodesy, vol 81 n° 5 (May 2007)
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Titre : The topographic bias by analytical continuation in physical geodesy Type de document : Article/Communication Auteurs : Lard Erik Sjöberg, Auteur Année de publication : 2007 Article en page(s) : pp 345 - 350 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] erreur systématique
[Termes IGN] formule de Stokes
[Termes IGN] géoïde terrestre
[Termes IGN] potentiel de pesanteur terrestreRésumé : (Auteur) This study emphasizes that the harmonic downward continuation of an external representation of the Earth’s gravity potential to sea level through the topographic masses implies a topographic bias. It is shown that the bias is only dependent on the topographic density along the geocentric radius at the computation point. The bias corresponds to the combined topographic geoid effect, i.e., the sum of the direct and indirect topographic effects. For a laterally variable topographic density function, the combined geoid effect is proportional to terms of powers two and three of the topographic height, while all higher order terms vanish. The result is useful in geoid determination by analytical continuation, e.g., from an Earth gravity model, Stokes’s formula or a combination thereof. Copyright Springer Numéro de notice : A2007-123 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0112-2 En ligne : https://doi.org/10.1007/s00190-006-0112-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28486
in Journal of geodesy > vol 81 n° 5 (May 2007) . - pp 345 - 350[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-07051 RAB Revue Centre de documentation En réserve L003 Disponible 266-07052 RAB Revue Centre de documentation En réserve L003 Disponible Airborne LaCoste & Romberg gravimetry: a space domain approach / M. Abbasi in Journal of geodesy, vol 81 n° 4 (April 2007)
PermalinkDetermination of the free core nutation period from tidal gravity observations of the GGP superconducting gravimeter network / B. Ducarme in Journal of geodesy, vol 81 n° 3 (March 2007)
PermalinkThe geopotential value W 0 for specifying the relativistic atomic time scale and a global vertical reference system / M. Bursa in Journal of geodesy, vol 81 n° 2 (February 2007)
PermalinkPermalinkLocal solutions to inverse problems in geodesy: The impact of the noise covariance structure upon the accuracy of estimation / F. Bauer in Journal of geodesy, vol 81 n° 1 (January 2007)
PermalinkPermalinkNational report of the Federal Republic of Germany on the geodetic activities in the years 2003-2007, XXIV [24th] general assembly of the International Union for Geodesy and Geophysics (IUGG) 2007 in Perugia, Italy / J. Muller (2007)
PermalinkPseudo-stochastic orbit modeling of low earth satellites using the Global Positioning System / Adrian Jäggi (2007)
PermalinkSwiss national report on the geodetic activities in the years 2003 to 2007 presented to the XXIV [24] general assembly of the International Union of Geodesy and Geophysics in Perugia, Italy, July 2007 / Commission géodésique suisse (2007)
PermalinkPermalinkWavelet modeling of regional and temporal variations of the Earth’s gravitational potential observed by GRACE / M.J. Fengler in Journal of geodesy, vol 81 n° 1 (January 2007)
PermalinkThe ellipsoidal correction to the Stokes kernel for precise geoid determination / M. Najafi-Alamdari in Journal of geodesy, vol 80 n° 12 (December 2006)
PermalinkBathymetry from space: Rationale and requirements for a new, high-resolution altimetric mission / D. Sandwell in Comptes rendus : Géoscience, vol 338 n° 14-15 (November 2006)
PermalinkContribution of laser ranging to Earth's sciences / Pierre Exertier in Comptes rendus : Géoscience, vol 338 n° 14-15 (November 2006)
Permalinkvol 338 n° 14-15 - November 2006 - La Terre observée depuis l'espace (Bulletin de Comptes rendus : Géoscience) / Anny Cazenave
PermalinkA simulation study of the errors of omission and commission for GRACE RL01 gravity fields / B. Gunter in Journal of geodesy, vol 80 n° 7 (October 2006)
PermalinkChoix optimal d'un modèle analytique de covariance pour la validation des mesures gravimétriques par la méthode de collocation (application : nord de l'Algérie) / S.A. Benahmed Daho in XYZ, n° 108 (septembre - novembre 2006)
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 orthometric height and the holonomity problem / Fernando Sanso in Journal of geodesy, vol 80 n° 5 (August 2006)
PermalinkA synthetic Earth gravity model designed specially for testing regional gravimetric geoid determination algorithms / I. Baran in Journal of geodesy, vol 80 n° 1 (April 2006)
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