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A high resolution global gravity field model combining CHAMP and GRACE satellite mission and surface data: EIGEN-CG01C

Reigber, C., Schwintzer, P., Stubenvoll, R., Schmidt, R., Flechtner, F., Meyer, U., König, R., Neumayer, K.-H., Förste, C., Barthelmes, F., Zhu, S. Y., Balmino, G., Biancale, R., Lemoine, J.-M., Meixner, H., Raimondo, J.-C. (2006): A high resolution global gravity field model combining CHAMP and GRACE satellite mission and surface data: EIGEN-CG01C, (Scientific Technical Report STR ; 06/07), Potsdam : Deutsches GeoForschungsZentrum GFZ, 12 S.  p.
DOI: http://doi.org/10.2312/GFZ.b103-06075



http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:8704
Resources

0607.pdf
(Publisher version), 2MB

Authors

Reigber ,  Christoph

Schwintzer ,  P.

Stubenvoll ,  Richard

Schmidt ,  R.

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/flechtne

Flechtner ,  Frank
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Meyer ,  U.

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/koenigr

König ,  Rolf
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/hneum

Neumayer ,  Karl-Hans
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/foer

Förste ,  Christoph
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/bar

Barthelmes ,  Franz
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Zhu ,  S. Y.

Balmino ,  G.

Biancale ,  Richard

Lemoine ,  J.-M.

Meixner ,  H.

http://gfzpublic.gfz-potsdam.de/cone/persons/resource/raimondo

Raimondo ,  Jean-Claude
1.2 Global Geomonitoring and Gravity Field , 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Scientific Technical Report STR, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Abstract
The striking improvements in long- to medium-wavelengths gravity field recovery achieved with GPS-CHAMP and GPS-GRACE high-low and GRACE K-band range low-low satellite-to-satellite tracking prompted us to combine the satellite data with surface data from altimetry over the oceans and gravimetry over the continents to generate a new, high resolution global gravity field model: EIGEN-CG01C. The model is complete to degree/order 360 in terms of spherical harmonics and resolves half-wavelengths of 55 km in the geoid and gravity anomaly fields. A special band-limited combination method has been applied in order to preserve the high accuracy from the satellite data in the lower frequency band of the geopotential and to allow for a smooth transition to the high-frequency band, dominated by the surface data. Compared to pre-CHAMP/GRACE global high-resolution gravity field models, the accuracy was improved by one order of magnitude to 4 cm and 0.5 mgal in terms of geoid heights and gravity anomalies, respectively, at a spatial resolution of 200 km half-wavelength. The overall accuracy at degree/order 360 is estimated to be 20 cm and 5 mgal, respectively, and benefits significantly from recently released new gravity anomaly compilations over the polar regions. In general, the accuracy over the oceans is better than over the continents reflecting the higher quality of the available surface data.