Newton's
Bulletin
Issue n. 5, June 2015 - Assessment of GOCE Geopotential Models [pp. 3-12]
Evaluation of EGM 2008 and EIGEN-6C3stat by means of data from GNSS/leveling
J. Kostelecky, J. Klokocnik, A. Bezdek
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Abstract
The global combined high-resolution gravity field models EGM 2008
and EIGEN-6C3stat are compared by means of gravity anomalies and the radial
component of the Marussi tensor.
The role of the GOCE gradiometry data is detected. GNSS/leveling provides independent
data source to evaluate any gravity field model. We apply such data to test EGM 2008
(without GOCE measurements) and EIGEN-6C3stat (already with them). The GNSS/leveling
data set is dense (1024 points) and precise (ellipsoidal height error below 2 cm) but is
available only over the territory of the Czech Republic with this density; this test
has in turn a limited validity. The RMS of height differences between GNSS/leveling
and EGM 2008 or GNSS/leveling and EIGEN-6C3stat is 3.3 cm or 4.1cm,
respectively.