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Improved Resolution of a GRACE Gravity Field Model by Regional Refinements

  • A Eicker
  • T Mayer-Guerr
  • K.H Ilk
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 133)

Abstract

The available gravity field models derived from data of the GRACE mission (tapley and Reigber (2001)) have provided us with an unprecedented accuracy in gravity field determination. Nevertheless the projected GRACE baseline accuracy has not been achieved yet. One reason out of many could be the insufficient modelling of the satellite data by a global representation by means of spherical harmonics. To extract the signal information present in the satellite and sensor data to full content, it seems reasonable to improve global solutions by regional recovery strategies. Especially in the higher frequency part of the spectrum the gravity field features differ in different geographical areas. Therefore the recovery procedure should be adapted according to the characteristics in the respective area.

In the approach presented here in a first step a global gravity field represented by a spherical harmonic expansion up to a moderate degree has to be derived. It is then refined by regionally adapted high resolution refinements being parameterized by splines as space localizing base functions. In this context a special attention is paid to the signal to noise ratio in different geographical areas.

The approach is demonstrated by examples based on the analysis of the original GRACE Level 1B data

Keywords

GRACE Regional gravity field recovery Space localizing basis functions Regularization 

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References

  1. Eicker A, Mayer-Guerr T, Ilk KH (2006) An Integrated Global/Regional Gravity Field Determination Approach based on GOCE Observations. Observation of the Earth System from Space, Springer, Berlin - HeidelbergGoogle Scholar
  2. Freeden W, Gervens T, Schreiner M (1998) Constructive Approximation on the Sphere. Oxford University Press, OxfordGoogle Scholar
  3. Koch KR, Kusche J (2001) Regularization of geopotential determination from satellite data by variance components. J Geodesy 76 (5):259–268CrossRefGoogle Scholar
  4. Lemoine FG, Kenyon SC, Factor JK, Trimmer RG, Pavlis NK, Chinn DS, Cox CM, Klosko SM, Luthcke SB, Torrence MH, Wang YM, Williamson RG, Pavlis EC, Rapp RH, Olson TR (1998) The development of the joint NASA GSFC and the National Imagery and Mapping Agency (NIMA) geopotential model EGM96. NASA/TP-1998-206861, Goddard Space Flight Center, Grenbelt, MDGoogle Scholar
  5. Mayer-Guerr T, (2006) Gravitationsfeldbestimmung aus der Analyse kurzer Bahnboegen am Beispiel der Satellitenmissioncn CHAMP und GRACE, Dissertation University of Bonn, http://hss.ulb.uni-bonn.de/diss-online/landw_fak/ 2006/mayer-guerr-torsten
  6. Sneeuw N, (1994) Global spherical harmonic analysis by least squares and numerical quadrature methods in historical perspective. Geophys. J. Int., 118: 707–716CrossRefGoogle Scholar
  7. Tapley BD, Reigber C (2001) The GRACE mission: status and future plans. Report for mission selection, in The four candidate Earth explorer core missions, Eos Trans AGU 82 (47), Fall Meet. Suppl., G41 C-02Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • A Eicker
    • 1
  • T Mayer-Guerr
    • 1
  • K.H Ilk
    • 1
  1. 1.Institute of Geodesy and Geoinformation University of BonnD-53115 BonnGermany

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