EUVN and Earth gravity models
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CHAMP, GRACE and further GOCE satellite missions are defining new standards in modeling of the Earths gravity field. They are influencing heights systems on global, regional and national levels.

Heæimoviæ, Ž. (2005): Spectral behavior of global gravitational models considering EUVN network. Symposium of the IAG Subcommission for Europe. European Reference Frame - EUREF 2004, Vienna, 1 - 4 June 2005.  Download article

    Spectral development of Earth gravity models in EUVN points

Table: Used global gravitational models

Spectral development of CG01c, EGM96, EGM96s, CHAMP03s, GRACE02s Earth gravity models in two EUVN points and EGG97 and EUVN undulations are shown on the figures below.

Fig. Spectral development in IT04 EUVN point


Fig. Spectral development in KOSG EUVN point
    Spectral development of CHAMP-GRACE-Terrestrial data Earth gravity model - CG01c

Animation of the spectral development of Earth gravity model CG01c on the territory of Europe is showing behavior of Earth gravity field in different wavelengths.

Because big change in scale animation is divided two parts:
1) Spectral development from 2 to 101 for the whole territory of Europe,
2) Spectral development from 102 to 360

1) Spectral development from 2 to 101 for the territory of Europe

    Call animation (9,1 MB)


2) Spectral development from 102 to 360


    Call animation (30,2 MB)

    Big errors of EUVN considering EGM96, GGM01c and CG01c Earth gravity models


Table: Big EUVN errors (>0,5 m) considering EGM96, GGM01c and CG01c Earth gravity models.

Almost all EUVN big errors detected by EGG97 are in coastal regions (s. Fig. below).

Fig. Big errors (>0,5 m) in EUVN points considering European gravimetric geoid 1997 (EGG97) and Earth gravity model CG01c


Fig. Big errors (>0,5 m) in EUVN points considering European gravimetric geoid 1997 (EGG97), CG01c and EGM96 Earth gravity model


    Datum differences between EUVN and gravity models

Average value of differences between EUVN and Earth gravity models undulations can be, in the first approximation, seen as datum differences.
European gravimetric geoid 1997 (EGG97) is fitted on EUVN network.
The main statistical characteristics of EUVN and geoid models undulation differences in table below are calculated without points with big errors.

Table: The main statistical characteristics of EUVN
and geoid models undulation differences (120 points)
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