Delft Gravity Model, release 1, Satellite-only (DGM-1S)

The DGM-1S represents the static part of the Earth’s gravity field at the global scale. The model has been compiled at the Delft University of Technology in collaboration with the GNSS Research Center of Wuhan University on the basis of an optimal combination of data acquired by the GRACE (Gravity Recovery and Climate Experiment) and GOCE (Gravity field and steady-state Ocean Circulation Explorer).

Research team

Model description

The DGM-1S has been compiled in terms of spherical harmonic coefficients up to degree 250 based on:

  1. 7 years of GRACE K-Band Ranging (KBR) data (Feb. 2003 – Dec. 2009)
  2. 4 years of GRACE satellites’ kinematic orbit data (Jan. 2006 – Dec. 2009)
  3. 14 months of GOCE kinematic orbit data (Aug. 2009 – Dec. 2010)
  4. 10 months of GOCE Satellite Gravity Gradiometry (SGG) data (Nov. 2009 – Dec. 2010).

The coefficients can be downloaded from here. The details about the compilation of this model can be found in the description document.

References

Hashemi Farahani H, Ditmar P, Klees R, Liu X, Zhao Q, and Guo J (2012a) The Earth's static gravity field model DGM-1S from an optimal combination of GRACE and GOCE data: computation and validation aspects. J Geod, in review.

Hashemi Farahani H, Ditmar P, Klees R, Teixeira da Encarnacao J, Liu X, Zhao Q, and Guo J (2012b) Validation of Earth's static gravity field models using GRACE K-band ranging and GOCE gradiometry data. Geophys J Int, in review.