1st stage

The 1st stage of the project was dedicated to the data collection: first vertical deflection observations have been done in Riga region and 46 GNSS 4 hour sessions have been carried out on the 1st order levelling network and postprocessed using Bernese GNSS Software v. 5.2. As reference stations 9 European Permanent Network (EPN) stations have been chosen around Latvia including station RIGA, as well as BOR1, LAMA, JOEN (Poland), GLSV (Ukraine), MAR6, ONSA (Sweden), PULK (Russia), VLNS (Lithuania). Partially elipsoidal heights, as well as all both 1st and 2nd order levelling data were provided by Latvian Geospatial Information Agency (LGIA). The Riga region has been chosen for the test computations of quasi-geoid model using VD observations. More information can be found in published conference proceedings 1 and 2. 

Published conference proceedings and articles:

1. Morozova, K., Balodis, J., Jäger, R., Zariņš, A., Rubāns, A. Digital Zenith Camera’s Results and Its Use in DFHRS v.4.3 Software for Quasi-geoid Determination. 2017 Baltic Geodetic Congress (BGC Geomatics), 2017, 74, pp.174-178. Available from: doi:10.1109/BGC.Geomatics.2017.74

2. Morozova, K., Jäger, R., Balodis, J., Kaminskis, J. Software Development and Its Description for Geoid Determination Based on Spherical-Cap-Harmonics Modelling Using Digital-Zenith Camera and Gravimetric Measurements Hybrid Data. IOP Conference Series: Materials Science and Engineering, 2017, Vol.251, pp.1-10. ISSN 1757-8981. e-ISSN 1757-899X. Available from: doi:10.1088/1757-899X/251/1/012065

3. Balodis, J., Morozova, K., Reiniks, M., Normand, M. Normal Heights for GNSS Reference Station Antennas. IOP Conference Series: Materials Science and Engineering, 2017, Vol.251, pp.1-6. ISSN 1757-8981. e-ISSN 1757-899X. Available from: doi:10.1088/1757-899X/251/1/012063