Released
Dataset

The Earth's gravity field as seen by the GOCE satellite - an improved sixth release derived with the time-wise approach (GO_CONS_GCF_2_TIM_R6)

Cite as:

Brockmann, Jan Martin; Schubert, Till; Mayer-Gürr, Torsten; Schuh, Wolf-Dieter (2019): The Earth's gravity field as seen by the GOCE satellite - an improved sixth release derived with the time-wise approach (GO_CONS_GCF_2_TIM_R6). GFZ Data Services. http://doi.org/10.5880/ICGEM.2019.003

Status

I   N       R   E   V   I   E   W : Brockmann, Jan Martin; Schubert, Till; Mayer-Gürr, Torsten; Schuh, Wolf-Dieter (2019): The Earth's gravity field as seen by the GOCE satellite - an improved sixth release derived with the time-wise approach (GO_CONS_GCF_2_TIM_R6). GFZ Data Services. http://doi.org/10.5880/ICGEM.2019.003

Abstract

The static gravitational model GO_CONS_GCF_2_TIM_R6 Is the 6th release of the GOCE gravity field model by means of the time-wise approach.

GOCE Input Data:

- Gradients: EGG_NOM_2 (re-calibration, released 2018, version 0202)

- Orbits:
-- SST_PKI (kinematic orbits); SST_PCV (variance information of kinematic orbit positions),
-- SST_RNX (original RINEX orbit data)

- Attitude: EGG_IAQ_2C
- Non-conservative accelerations: EGG_CCD_2C
- Data period: 09/10/2009 - 20/10/2013

No static a-priori gravity field information applied (neither as reference model, nor for constraining the solution)


Processing procedures:

- Gravity from orbits (SST):
- short-arc integral method applied to kinematic orbits, up to degree/order 150
- orbit variance information included as part of the stochastic model, it is refined by empirical covariance functions

- Gravity from gradients (SGG):
- parameterization up to degree/order 300
- observations used: Vxx, Vyy, Vzz and Vxz in the Gradiometer Reference Frame (GRF)
- realistic stochastic modelling by applying digital decorrelation filters to the observation equations; estimated separately for individual data segments applying a robust procedure

- Combined solution:
- addition of normal equations (SST D/O 150, SGG D/O 300)
- Constraints:
* Kaula-regularization applied to coefficients of degrees/orders 201 - 300 (constrained towards zero)
* observation equations for zero gravity anomaly observations in polar regions (>83°) to constrain polar gaps towards zero (degree 11 to 300)

- Optimum weighting (SST, SGG, constraints) based on variance component estimation


Specific features of resulting gravity field:
- Gravity field solution is independent of any other gravity field information
- Constraint towards zero starting from degree/order 201 to improve signal-to-noise ratio
- Related variance-covariance information represents very well the true errors of the coefficients
- Solution can be used for independent comparison and combination on normal equation level with other satellite-only models (e.g. GRACE), terrestrial gravity data, and altimetry
- Since in the low degrees the solution is based solely on GOCE orbits, it is not competitive with a GRACE model in this spectral region is available via this data publication and via ICGEM (Ince et al., 2019). Link to ICGEM Website: http://icgem.gfz-potsdam.de
- The reference epoch is 2010-01-01 (MJD 55197)

Further processing details can be found in Brockmann (2014), Brockmann et al. (2014) Mayer-Gürr et al. (2005) and Pail et al. (2014).

Contact

  • Brockmann, Jan Martin; Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany;
  • ICGEM Support; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Contributors

Ince, Elmas Sinem; Reißland, Sven

Keywords

ICGEM, global gravitational model, GOCE

GCMD Science Keywords

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      • publisher: GFZ Data Services
      • publicationYear: 2019
      • subjects
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        • subject: global gravitational model
        • subject: GOCE
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0001-6293-5336
          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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      • Data_Set_Citation
        • Dataset_Creator: Brockmann, Jan Martin; Schubert, Till; Mayer-Gürr, Torsten; Schuh, Wolf-Dieter
        • Dataset_Title: The Earth's gravity field as seen by the GOCE satellite - an improved sixth release derived with the time-wise approach (GO_CONS_GCF_2_TIM_R6)
        • Dataset_Release_Date: 2019
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        • Topic: SOLID EARTH
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      • Summary
        • Abstract: The static gravitational model GO_CONS_GCF_2_TIM_R6 Is the 6th release of the GOCE gravity field model by means of the time-wise approach. GOCE Input Data: - Gradients: EGG_NOM_2 (re-calibration, released 2018, version 0202) - Orbits: -- SST_PKI (kinematic orbits); SST_PCV (variance information of kinematic orbit positions), -- SST_RNX (original RINEX orbit data) - Attitude: EGG_IAQ_2C - Non-conservative accelerations: EGG_CCD_2C - Data period: 09/10/2009 - 20/10/2013 No static a-priori gravity field information applied (neither as reference model, nor for constraining the solution) Processing procedures: - Gravity from orbits (SST): - short-arc integral method applied to kinematic orbits, up to degree/order 150 - orbit variance information included as part of the stochastic model, it is refined by empirical covariance functions - Gravity from gradients (SGG): - parameterization up to degree/order 300 - observations used: Vxx, Vyy, Vzz and Vxz in the Gradiometer Reference Frame (GRF) - realistic stochastic modelling by applying digital decorrelation filters to the observation equations; estimated separately for individual data segments applying a robust procedure - Combined solution: - addition of normal equations (SST D/O 150, SGG D/O 300) - Constraints: * Kaula-regularization applied to coefficients of degrees/orders 201 - 300 (constrained towards zero) * observation equations for zero gravity anomaly observations in polar regions (>83°) to constrain polar gaps towards zero (degree 11 to 300) - Optimum weighting (SST, SGG, constraints) based on variance component estimation Specific features of resulting gravity field: - Gravity field solution is independent of any other gravity field information - Constraint towards zero starting from degree/order 201 to improve signal-to-noise ratio - Related variance-covariance information represents very well the true errors of the coefficients - Solution can be used for independent comparison and combination on normal equation level with other satellite-only models (e.g. GRACE), terrestrial gravity data, and altimetry - Since in the low degrees the solution is based solely on GOCE orbits, it is not competitive with a GRACE model in this spectral region is available via this data publication and via ICGEM (Ince et al., 2019). Link to ICGEM Website: http://icgem.gfz-potsdam.de - The reference epoch is 2010-01-01 (MJD 55197) Further processing details can be found in Brockmann (2014), Brockmann et al. (2014) Mayer-Gürr et al. (2005) and Pail et al. (2014).
      • Metadata_Name: DIF
      • Metadata_Version: 9.8.2
  • escidoc:  /  download xml
    • resource
      • title (xml:lang=eng): The Earth's gravity field as seen by the GOCE satellite - an improved sixth release derived with the time-wise approach (GO_CONS_GCF_2_TIM_R6)
      • creator
        • creatorName: Brockmann, Jan Martin
        • givenName: Jan Martin
        • familyName: Brockmann
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-7647-4515
        • affiliation: Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany
      • creator
        • creatorName: Schubert, Till
        • givenName: Till
        • familyName: Schubert
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0001-5192-6629
        • affiliation: Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany
      • creator
        • creatorName: Mayer-Gürr, Torsten
        • givenName: Torsten
        • familyName: Mayer-Gürr
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0003-2609-428X
        • affiliation: Institute of Geodesy, Theoretical Geodesy and Satellite Geodesy Group, TU Graz, Austria
      • creator
        • creatorName: Schuh, Wolf-Dieter
        • givenName: Wolf-Dieter
        • familyName: Schuh
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-3522-3146
        • affiliation: Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany

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    License: CC BY 4.0