Gravity field models from GPS tracking (up to degree 120)
The presented geopotential solutions were obtained by inversion of precise GPS positions, the computational method is described in the reference below. For experienced users, on this page 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).In Table 1, 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_nmax120.txt.
In Table 2 there are static solutions obtained in the years 2003–2009, which combined yielded the solutions in Table 1.
Reference
These data are free for scientific use, please cite this reference:
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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
Preprint: Bezdek_et_al_2014_Gravity_field_models_from_kinematic_orbits_of_CHAMP,_GRACE_and_GOCE_satellites.pdf (2 MB)
Table 1. Static long-term gravity field models (up to degree 120)
| CHAMP | GRACE A | GRACE B | |
| Solution | asu-ch-0309.gfc (1 MB) | asu-ga-0309.gfc (1 MB) | asu-gb-0309.gfc (1 MB) |
| CM: Part I | asu-ch-0309-cm-1.txt.zip (389 MB) | asu-ga-0309-cm-1.txt.zip (389 MB) | asu-gb-0309-cm-1.txt.zip (389 MB) |
| CM: Part II | asu-ch-0309-cm-2.txt.zip (472 MB) | asu-ga-0309-cm-2.txt.zip (472 MB) | asu-gb-0309-cm-2.txt.zip (472 MB) |
| CM: Part III | asu-ch-0309-cm-3.txt.zip (354 MB) | asu-ga-0309-cm-3.txt.zip (354 MB) | asu-gb-0309-cm-3.txt.zip (354 MB) |
Table 2. Static yearly gravity field models (up to degree 120)
| year | CHAMP | GRACE A | GRACE B |
| 2003 | asu-ch-03.gfc (1 MB) | asu-ga-03.gfc (1 MB) | asu-gb-03.gfc (1 MB) |
| 2004 | asu-ch-04.gfc (1 MB) | asu-ga-04.gfc (1 MB) | asu-gb-04.gfc (1 MB) |
| 2005 | asu-ch-05.gfc (1 MB) | asu-ga-05.gfc (1 MB) | asu-gb-05.gfc (1 MB) |
| 2006 | asu-ch-06.gfc (1 MB) | asu-ga-06.gfc (1 MB) | asu-gb-06.gfc (1 MB) |
| 2007 | asu-ch-07.gfc (1 MB) | asu-ga-07.gfc (1 MB) | asu-gb-07.gfc (1 MB) |
| 2008 | asu-ch-08.gfc (1 MB) | asu-ga-08.gfc (1 MB) | asu-gb-08.gfc (1 MB) |
| 2009 | asu-ch-09.gfc (1 MB) | asu-ga-09.gfc (1 MB) | asu-gb-09.gfc (1 MB) |
| all years | asu-ch-all-years.zip (2 MB) | asu-ga-all-years.zip (2 MB) | asu-gb-all-years.zip (2 MB) |
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Last modified: 16 July 2020 14:14:36.