On the Geodynamics in Latvia
Balodis, Janis; Haritonova, Diana; Janpaule, Inese; Normand, Madara; Silabriedis, Gunars; Zarinsjh, Ansis; Rubans, Augusts; Kalinka, Maris
University of Latvia, LATVIA

The coming Galileo and GPS III full operation capacities are highly promising for broad opportunities to use the applications of GNSS technologies for various studies of environment using precise point positioning static and real time kinematic methods. For normal height determination purposes more and more arising requirements for the high precision detailed geoid model. The need for improved national geoid model is an urgent topic in the solid Earth geodetic studies at the Institute of Geodesy and Geoinformatics, University of Latvia. During the last years the research were devoted to the several issues related the geodynamics in Latvia: (1) attempts to improve the precision of the national geoid model using different input data, different global and reginal Earth gravity models for comparison and using 2 different software packages. Geoid height reference surface for Latvia of the precision of RMS 1.6 cm was obtained; (2) selective examination of the distorsions of national and local geodetic height reference network; (3) the analysis of the GNSS permanent station observation data time series and station displacements affected by Earth tides for period of 5 years; (4) the success of development of digital zenith camera for vertical deflection and application fer geoid model improvement. The interpretation of the achieved results and the discussion on the mutual agreement and disagreement of the obtained results will be presented. Acknowledgement. The research was funded by ERAF project in Latvia, Nr 2010/0207/2DP/