The goal. The UQG2012 regional quasigeoid solution of an accuracy better than 4 cm with respect to the GPS-levelling data of the 1st and 2nd order was constructed by means of the least squares collocation method. In the first iteration the gravimetry-only quasigeoid UQG2011 was developed from the gravity anomalies for the subsequent detection of gross errors in GPS-leveling data. All terrain reductions were based on the 3x3 digital terrain model SRTM3. Scientific significance. Thus, the final UQG2012 solution consists of gravity anomalies and quasigeoid heights at the points of a 23 grid evaluated by means of the collocation method applied to the set of 4070 GPS-leveling quasigeoid heights plus the above mentioned gravimetry data. After first iteration, the comparison of the UQG2012 solution with all independent GPS-leveling data (1st – 4th order networks given in the Baltic height system) shows a good agreement with rms < 4 cm. This noise level corresponds to an estimated accuracy of the quasigeoid UQG2012 for the Ukraine and Moldova area higher than 4–5 cm with respect to GPS-leveling points of different orders. The evaluation of the UQG2012 solution with independent GPS-leveling data of the 1st and 2nd orders gives a significantly better agreement with rms of about 1.5 cm. Finally, the comparison with the European quasigeoid EGG08 leads to differences of about 20-50 cm (with rms level about 10 cm) in certain areas and to the total mean shift of 25 cm caused by the different height systems used.
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