Gravity field models from GPS tracking
The presented geopotential solutions were obtained by inversion of precise GPS positions,
the computational method is described in the paper.
These data are free for scientific use, please cite the reference.
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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.
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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)
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To easily produce 2D/3D images and animations from any geopotential model, you may have a look at our free Matlab package:
MATLAB script for 3D visualizing geodata on a rotating globe
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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)
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We also provide the data for our first estimates of geocentre motion (scaled degree one harmonic coefficients)
derived from GPS positions of satellites GRACE A/B spanning the years 2005–2009:
Reference
These data are free for scientific use, please cite this reference:
Up to Aleš Bezděk: Research
Any comments or questions will be appreciated – if you have some, please contact: Ales Bezdek < >.
Last modified: 22 January 2015 16:29:14. |
