Combined modeling of the Earth's gravity field from GRACE and GOCE satellite observations: A numerical study

R. Ditmar, X. Liu, R. Klees, Robert Tenzer, R. Moore

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

A numerical study has been conducted in order to estimate how a gravity field model obtained from GOCE data can be improved in the range of low degrees by addition of GRACE data. The GRACE data are simulated as inter-satellite accelerations. Different types of noise in the inter-satellite accelerations are considered, including white noise. The gravity field model is represented as a series of spherical harmonics; the Stokes coefficients are computed by a least-squares adjustment. It is shown that the incorporation of GRACE data may improve a GOCE-based gravity field model up to degree 120 or even higher depending on the type of noise in the inter-satellite accelerations. Moreover, the joint model at lower degrees may show a significantly higher quality that either a stand-alone GOCE-based or a stand-alone GRACE-based model. It is important, however, that proper covariance matrices of the involved data sets are used in the joint data processing.
Original languageEnglish
Title of host publicationDynamic Planet
Subtitle of host publicationMonitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools - lAG Symposium
Pages403-409
Number of pages7
Volume130
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes
EventIAG Symposium on Dynamic Planet: Monitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools - Cairns, QLD, Australia
Duration: 22 Aug 200526 Aug 2005

Conference

ConferenceIAG Symposium on Dynamic Planet: Monitoring and Understanding a Dynamic Planet with Geodetic and Oceanographic Tools
CountryAustralia
CityCairns, QLD
Period22/08/0526/08/05

Keywords

  • Earth's gravity field
  • GOCE
  • GRACE
  • Gravity gradiometry
  • Inter-satellite accelerations

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Geophysics

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