Details
| Original language | English |
|---|---|
| Title of host publication | Earth on the Edge |
| Subtitle of host publication | Science for a Sustainable Planet - IAG General Assembly, Proceedings |
| Editors | Chris Rizos, Pascal Willis |
| Publisher | Springer Verlag |
| Pages | 399-405 |
| Number of pages | 7 |
| ISBN (electronic) | 9783642372216 |
| Publication status | Published - 2014 |
| Event | International Association of Geodesy Symposia, IAG 2011 - , Austria Duration: 28 Jun 2011 → 2 Jul 2011 |
Publication series
| Name | International Association of Geodesy Symposia |
|---|---|
| Volume | 139 |
| ISSN (Print) | 0939-9585 |
Abstract
The important issue of quality assessment of GOCE gravitational gradients is addressed. The validation approach that is investigated compares measured gravitational gradients in satellite track cross-overs (XOs). Important updates and changes of our previous XO processing are presented: XO comparison has to be performed in one and the same coordinate system, which necessitates the transformation of the gravitational gradient tensor. As two of the six independent tensor components are less accurate and the remaining four components contain long-periodic inaccuracies, filtering of the gradient time series and the use of model information is required to enable tensor rotation without loss of accuracy. The second part of the paper focuses on the analysis of residual gradient differences in cross-overs. RMS values and the geographical distribution of the XO residuals are used to assess the GOCE gravitational gradients’ quality. The RMS values of the XO residuals are about 3.2 mE for Vxx and Vyy, and 5.3 mE for Vzz. Areas are identified showing an accumulation of slightly larger XO residuals for individual tensor components. These larger residuals are probably caused by solar winds and an interaction of the accelerometers with the Earth’smagnetic field. In summary, the high quality of the GOCE gravitational gradients is confirmed.
Keywords
- Cross-over, GOCE, Gravitational gradient, Quality assessment, Tensor rotation, Validation
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Computers in Earth Sciences
- Earth and Planetary Sciences(all)
- Geophysics
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Earth on the Edge: Science for a Sustainable Planet - IAG General Assembly, Proceedings. ed. / Chris Rizos; Pascal Willis. Springer Verlag, 2014. p. 399-405 (International Association of Geodesy Symposia; Vol. 139).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Validation of GOCE gravitational gradients in satellite track cross-overs
AU - Brieden, Phillip
AU - Müller, Jürgen
N1 - Funding information: This work was supported by the German Federal Ministry of Education and Research (BMBF) in the framework of the GEOTECHNOLOGIEN research program under the projects REAL GOCE (Grant 03G0726C) and Future Missions (Grant 03G0729C).
PY - 2014
Y1 - 2014
N2 - The important issue of quality assessment of GOCE gravitational gradients is addressed. The validation approach that is investigated compares measured gravitational gradients in satellite track cross-overs (XOs). Important updates and changes of our previous XO processing are presented: XO comparison has to be performed in one and the same coordinate system, which necessitates the transformation of the gravitational gradient tensor. As two of the six independent tensor components are less accurate and the remaining four components contain long-periodic inaccuracies, filtering of the gradient time series and the use of model information is required to enable tensor rotation without loss of accuracy. The second part of the paper focuses on the analysis of residual gradient differences in cross-overs. RMS values and the geographical distribution of the XO residuals are used to assess the GOCE gravitational gradients’ quality. The RMS values of the XO residuals are about 3.2 mE for Vxx and Vyy, and 5.3 mE for Vzz. Areas are identified showing an accumulation of slightly larger XO residuals for individual tensor components. These larger residuals are probably caused by solar winds and an interaction of the accelerometers with the Earth’smagnetic field. In summary, the high quality of the GOCE gravitational gradients is confirmed.
AB - The important issue of quality assessment of GOCE gravitational gradients is addressed. The validation approach that is investigated compares measured gravitational gradients in satellite track cross-overs (XOs). Important updates and changes of our previous XO processing are presented: XO comparison has to be performed in one and the same coordinate system, which necessitates the transformation of the gravitational gradient tensor. As two of the six independent tensor components are less accurate and the remaining four components contain long-periodic inaccuracies, filtering of the gradient time series and the use of model information is required to enable tensor rotation without loss of accuracy. The second part of the paper focuses on the analysis of residual gradient differences in cross-overs. RMS values and the geographical distribution of the XO residuals are used to assess the GOCE gravitational gradients’ quality. The RMS values of the XO residuals are about 3.2 mE for Vxx and Vyy, and 5.3 mE for Vzz. Areas are identified showing an accumulation of slightly larger XO residuals for individual tensor components. These larger residuals are probably caused by solar winds and an interaction of the accelerometers with the Earth’smagnetic field. In summary, the high quality of the GOCE gravitational gradients is confirmed.
KW - Cross-over
KW - GOCE
KW - Gravitational gradient
KW - Quality assessment
KW - Tensor rotation
KW - Validation
UR - http://www.scopus.com/inward/record.url?scp=84927642127&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-37222-3__53
DO - 10.1007/978-3-642-37222-3__53
M3 - Conference contribution
AN - SCOPUS:84927642127
T3 - International Association of Geodesy Symposia
SP - 399
EP - 405
BT - Earth on the Edge
A2 - Rizos, Chris
A2 - Willis, Pascal
PB - Springer Verlag
T2 - International Association of Geodesy Symposia, IAG 2011
Y2 - 28 June 2011 through 2 July 2011
ER -