Gravity field models from GPS tracking

  • Presented geopotential solutions were obtained by inversion of precise GPS positions, for details see References.
  • These data are free for scientific use, please cite the references.
  • Provided spherical harmonic coefficients are in the ICGEM format.
  • To easily produce 2D/3D images and animations, see our free tool: MATLAB script for 3D visualizing geodata on a rotating globe
  • Acronym "ASU" comes from "Astronomický ústav AV ČR" ("Astronomical Institute, Czech Academy of Sciences").

Gravity field models from GPS tracking: GRACE, Swarm

Updated monthly GPS gravity fields up to degree 40
Monthly GPS gravity fields for the 2016 paper
You can download GPS-based gravity fields that were used to produce Figures 1–3 in the following manuscript:
  • Bezděk A, Sebera J, Encarnação J, Klokočník J, 2016. Time-variable gravity fields derived from GPS tracking of Swarm. Geophys. J. Int. 205, 1665–1669. http://dx.doi.org/10.1093/gji/ggw094
Monthly GPS gravity fields up to degree 40 (shown in Figure 1): Monthly GPS gravity fields up to degree 15 (source data for Figures 2–3):

Gravity field models from GPS tracking of CHAMP, GRACE and GOCE (obtained in 2013)

  • In the following table, we provide long-term static solutions for individual satellites based on the kinematic positions spanning seven years (2003–2009). The harmonic coefficients are in the ICGEM format. The solutions are accompanied by their full covariance matrices (CM), their format is specified in this document: readme_asu_covariance_matrices.txt.
    CHAMP GRACE A GRACE B
    Solution asu-ch-0309_nmax075.gfc (258 kB)asu-ga-0309_nmax060.gfc (168 kB)asu-gb-0309_nmax060.gfc (168 kB)
    Covariance
    matrix
    asu-ch-0309-cm075.zip (189 MB)asu-ga-0309-cm060.zip (79 MB)asu-gb-0309-cm060.zip (79 MB)
    Maximum  
    degree
    75 60 60
    Geoid
    height

     
  • GOCE: The geopotential solution of maximum degree/order 75 derived from kinematic positions of GOCE covering the 2-month period: 1 Nov 2009 – 11 Jan 2010. No regularization was used. For other details, please see the reference paper (this is the solution shown in Fig. 12): asu-goce-2mn_nmax075_v1.gfc (259 kB)
     
  • For experienced users, it is possible to download our long-term solutions up to degree 120, and also their corresponding full covariance matrices. We emphasize that the high degree/order geopotential coefficients have large correlations among themselves, they were included in the fit in order to reduce the truncation error and there is not enough information in the observations for them to be clearly separated (see Section 3.7 of the paper).
    Geopotential solutions to degree 120 (ill posed coefficients inclusive)

References

  • Bezděk A, Sebera J, Klokočník J, Kostelecký J, 2014. Gravity field models from kinematic orbits of CHAMP, GRACE and GOCE satellites. Advances in Space Research 53, 412–429. http://dx.doi.org/10.1016/j.asr.2013.11.031
  • Bezděk A, Sebera J, Encarnação J, Klokočník J, 2016. Time-variable gravity fields derived from GPS tracking of Swarm. Geophys. J. Int. 205, 1665–1669. http://dx.doi.org/10.1093/gji/ggw094


Up to Aleš Bezděk: Research

Any comments or questions will be appreciated – if you have some, please contact: Ales Bezdek <>.

Last modified: 19 April 2017 10:34:14.