Combined Gravity Field Model EIGEN-CG01C

EIGEN-CG01C Geoid

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EIGEN-CG01C Free Air Gravity Anomalies

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Input Data

CHAMP (860 days) and GRACE (200 days) satellite gravity data have been combined with 0.5 x 0.5 deg surface data (gravimetry and altimetry) to generate the high resolution global gravity field model EIGEN-CG01C.

Solution Method

A special band-limited combination method has been applied to preserve the high accuracy resulting from the satellite information in the low frequency band and to form a smooth transition to the high frequency information coming from the surface data.

Results

Gravitational potential of the Earth in terms of 130317 spherical harmonic coefficients complete to degree and order 360 and resulting representation of the global geoid and the global free air gravity anomalies down to spatial features of 100 km full wavelength.

Applications

This highly accurate new gravity field model and global geoid model, respectively, will allow geodesists and cartographers to precisely link the various height datums around the globe together, will allow Space geodesists and satellite operators to determine orbits of near Earth satellites and to navigate satellites with much higher accuracy and will allow solid Earth scientists to much more accurately infer the Earth's internal structure and at finer resolution than was ever before possible from Space. Ocean scientists can combine this gravity model with ocean height measurements from satellite altimeters to study global ocean circulation on a finer scale than has been previously possible.

This will, in turn, enable a better understanding of the processes that drive the Earth's dynamic system (solid Earth, ocean and atmosphere), thus leading to better analysis and predictions of climate change & natural hazards (e.g., Earthquakes).

Download EIGEN-CG01C Data

Description of EIGEN-CG01C:

eigen-cg01c_v2.pdf (330 KB) updated on 11.11.2004
Format description of EIGEN-CG01C:

g002_GR-GFZ-FD-001_v1.1.pdf (65 KB)
EIGEN-CG01C gravity field coefficients:

EIGEN-CG01C_coef (7.9 MB)
EIGEN-CG01C_coef.gz (1.4 MB)
Calibrated errors of EIGEN-CG01C modell:

EIGEN-CG01C_err (2.4 MB)
EIGEN-CG01C_err.gz (0.4 MB)

References

A High Resolution Global Gravity Field Model Combining CHAMP and GRACE Satellite Mission and Surface Gravity Data: EIGEN-CG01C
Ch. Reigber(1), P. Schwintzer(1), R. Stubenvoll(1), R. Schmidt(1), F. Flechtner(1), U. Meyer(1), R. König(1), H. Neumayer(1), Ch. Förste(1), F. Barthelmes(1), S.Y. Zhu(1), G. Balmino(2), R. Biancale(2), J.-M. Lemoine(2), H. Meixner(3), J.C. Raimondo(3)
(1) GeoForschungsZentrum Potsdam (GFZ), Dept. 1 Geodesy and Remote Sensing, Potsdam, Germany (2) Group de Recherche de Geodesie Spatiale (GRGS), Toulouse, France (3) Teleorbit GmbH, Dietramszell/Linden, Germany
accepted by Journal of Geodesy
and abstract from Joint CHAMP/GRACE Science Meeting, GFZ, July 5-7, 2004 (page 16, no. 24 in Solid Earth Abstracts (pdf file))