GRIM5-C1: Combination solution of the global gravity field to degree and order 120

Details GRIM5-C1: Combination solution of the global gravity field to degree and order 120 GRIM5-C1: Combination solution of the global gravity field to degree and order 120

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4005g&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 24, p. 4005-4008

Physics

12

Geodesy And Gravity: Geopotential Theory And Determination, Geodesy And Gravity: Regional And Global Gravity Anomalies And Earth Structure, Geodesy And Gravity: Space Geodetic Surveys

Scientific paper

The new satellite Earth gravity field model GRIM5-S1 was recently prepared in a joint GFZ and GRGS effort. Based on this satellite solution and terrestrial and altimetric gravity anomalies from NIMA, a combined model GRIM5-C1, with full variance-covariance matrix up to degree and order 120, was computed. Surface gravity and altimetric gravity data are corrected for several systematic effects, such as ellipsoidal corrections and aliasing. A weighting scheme for gravity anomalies, according to their given standard deviations was developed. From each data set full normal equations were set up and finally combined with the GRIM5-S1 normals. To take into account good information from the satellite-only model a procedure was developed to identify such coefficients and appropriately weighed them in the final normal equation system. Internal error propagation and comparisons to external data sets show, that the GRIM5-C1 model represents the best state of long wave-length gravity field models.

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