engleski

Geomed2: High-Resolution Geoid Models of the Mediterranean

The main aim of the Geomed2 project was the estimation of the best possible marine geoid approximation, given the available marine gravity data, for the Mediterranean. For the geoid estimation, all available ship gravity data have been collected, edited, homogenized and used to derive the most homogeneous possible dataset in order to devise a gravimetric only geoid model. In that respect, special attention has been paid to the data debiasing, where both area-wise and track-wise methods were tested. The geoid estimation was based on the well-known remove-compute-restore method, employing different approaches for the actual geoid modeling. The available gravity data have been gridded on a regular 2’x 2’ grid in the computation area employing ordinary kriging, serving both as input to the geoid estimation methodologies and as a project deliverable to be disseminated as a new approximation of the gravity field over the Mediterranean. The components of the gravity field have been modeled using EIGEN-6C4 to d/o 1000 and different methods for RTC reduction have been tested. The Hirt models led to the best results. The estimated geoids have then been compared with GPS leveling data (not shown) and an independent oceanographic geoid. We present here the final gravity anomaly database, and the marine geoid solutions that were computed always with the same regular 2’x2’ residual gravity grid.

geoid ; Geomed2 ; The Geoid, Mean Sea Surfaces ; Mean Dynamic Topography

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