GNSS permanent stations as the part of integrated geodetic system in Estonia

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1 GNSS permanent stations as the part of integrated geodetic system in Estonia Karin Kollo (MSc) Department of Geodesy Estonian Land Board United Nations/Croatia Workshop on the applications of Global Navigation Satellite Systems, 21-25

2 Outline Integrated network concept Case study: Estonia Integrated network in Estonia GNSS permanent stations with GPS network points GNSS permanent stations with gravimetric network points GNSS permanent stations with levelling network points GNSS permanent stations with tide-gauges Co-locations: insights Future foresights

3 Integrated network concept Integrated network concept better possibilities to tie different techniques GNSS, Levelling, Gravity, Tide gauges, Meteorological, SLR & VLBI GNSS-technique can be used as a connection between the different measurement techniques

4 Case study: Estonia Determination of changes of geodetic quantities in space and time Postglacial uplift has an influence on measured geodetic quantities Unification of reference systems (vertical, 3D) Determination of geoid models (or transformation surfaces)

5 GNSS measurements and CORS Deformation studies, improvement the geophysical deformation models Repeated levelling Apparent land uplift Tide-gauges (Sea level data ) Gravity network Relative gravity measurements Absolute gravity measurements

6

7 Integrated network in Estonia Levelling network Within 1.5 km of the levelling lines 129 RGP points (60%) Gravimetric network From RGP points 56 are situated in a few kilometres range Sea level stations Distances from RGP points 1-12 km

8 GNSS permanent stations with GPS network points

9 GNSS permanent stations with gravimetric network points

10 GNSS permanent stations with levelling network points

11 GNSS permanent stations with tide-gauges

12 Co-locations: insight (2007)

13 Co-locations: insights (2008)

14 Future foresights Several techniques are available in one location In most CORS locations 3 different techniques available Establishment of double CORS stations to monitor the stability Establishment of stations with at least three measurement techniques available

15 References Andres Rüdja: Geodetic datums, reference systems and geodetic networks in Estonia, PhD thesis, Helsinki, 2004 Geodetic Point Database

16 Thank you for your attention!

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