Journal of Geomatics, vol.15, no.2, pp.202-207, 2021 (Refereed Journals of Other Institutions)
The yearly movements of IGS stations-RIGA (Riga, Latvia) and VIS (Visby, Sweden) in the Baltic Sea region have been studied in this paper. The standard data sets were taken from IGS database. For more than two decades, Global Navigation Satellite Systems (GNSS) have played a central role in understanding the movements of the Earth’s surface. Continuously operating base stations have recorded GNSS data. The data have been collected and processed to provide precise information on the continuous changes of the GNSS station positions. The aim of this study is to obtain horizontal (yearly) and vertical (seasonal) velocity fields of the RIGA and VIS in Latvia and Baltic Sea region covering a twenty-one year period 2000-2021. According to the results, a motion of about 2-2.5 cm/year (horizontal) was detected at the two IGS stations (VIS and RIGA) located in the nearby Baltic Sea. On the other hand, at the VIS point located in the middle of the Baltic Sea, a total of 5-6 cm height differences were obtained in the spring, summer and autumn seasons between 2000 and 2021, but this value was calculated as 4.2 cm in the winter season. In the RIGA point, located in the capital of Latvia, between 2000 and 2021, a total of 1-1.5 cm height differences were obtained in the spring, summer and autumn seasons, but this value was calculated as 8 mm in the winter season.