1. Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position P.Savvaidis, I. Ifadis, K. Lakakis Laboratory of Geodesy Department of Civil Engineering Aristotle University of Thessaloniki

2. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Established Autumn 1999 at the facilities of the Laboratory of Geodesy Continuous 24h operation since February 2000

3. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Ashtech Z-12 Continuous Reference Receiver Choke-Ring Antenna Ashtech Geodetic Base Station Software (GBSS)

4. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position To be used for: Geodynamical applications As a Reference GPS Station for surveying in the area of Thessaloniki RTCM corrections transmitted for Real Time Kinematic GPS applications, emphasis given to vehicle navigation in the area of greater Thessaloniki

5. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position The seismic area of Volvi (near Thessaloniki) 1978 earthquake

6. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Control network with terrestrial observations (1978 - 1985)

7. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position GPS measurements in a larger area, incl. Thessaloniki (1994, 1997) Permanent monitoring GPS Array under development (2001)

8. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position

9. UHF Radio Network for RTCM corrections transmission Control Station for Vehicle Navigation applications

10. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Initial Estimation of Position ITRF97 coordinates IGS Stations: ONSALA, HERS, GLSV, GRAZ, MAD2, SFER, NOTO, CAGLIARI, MEDICINA, MATERA, SOFI, TUBI, ZECK, NICO, RAMO, (TUC1) Adjustment: 42.8 mm (Horiz. Std.Dev.) 36.5 mm (Vert. Std. Dev.)

11. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Adjustment using stations: NOTO, MATERA, SOFI, NICO ITRF97 coordinates Raw data March 2000 14.2 mm (Horiz. Std.Dev.) 12.9 mm (Vert. Std. Dev.)

12. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Adjustment using stations: NOTO, MATERA, SOFI, NICO ITRF97 coordinates updated March 2000 Raw data March 2000 10.7 mm (Horiz. Std.Dev.) 9.4 mm (Vert. Std. Dev.)

13. P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position Coordinates of THES1 ITRF97 X=4463666.690 m ± 7.8 mm Y=1890982.232 m ± 8.6 mm Z=4131185.946 m ± 5.0 mm ITRF97 (upd. 3/2000) X=4463666.641 m ± 7.9 mm Y=1890982.281 m ± 8.6 mm Z=4131185.980 m ± 5.0 mm Differences DX= -0.049 m DY= 0.049 m DZ= 0.034 m