DETERMINATION OF PILLAR COORDINATES AT THE CALIBRATION BASELINE OF THE FACULTY OF GEODESY IN ZAGREB BY APPLYING GPS
11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 239-246 pp
The calibration baseline of the Faculty of Geodesy, University of Zagreb, is the longest
calibration baseline in the world numbering altogether 25 pillars. It was built in 1982 for
the purpose of testing and calibrating the electro-optical distance meters, and today even
GNSS instruments can be tested there. This calibration baseline provided a mutual
standard scale for the calibration of instruments at the distance up to 3100 m in the
Republic of Croatia and wider region. In this paper the determination of coordinates of
all 25 pillars of the calibration baseline of the Faculty of Geodesy, University of Zagreb
by applying of relative static GPS method is described. GPS method is used as an
independent control in the calibration of the baseline with precise electro-optical
distance meters. GPS measurements at the pillars of the calibration baseline were made
in two days with the observation interval of 30 minutes for each pillar. The processing
of GPS vectors and the adjustment of coordinates of the baseline pillars were made
using the software Trimble Geomatics Office, v. 1.62. For the purpose of adjusting the
coordinates, 2 GPS points of the Fundamental network of the City of Zagreb were used.
As the final result the coordinates of the calibration baseline pillars were given in
ETRS89 (European Terrestrial Reference System 1989), epoch 1989.00 (e=1989.00).
Keywords: calibration baseline, calibration, GPS, Trimble Geomatics Office, ETRS89.
PAPER 2011/s07.106: DETERMINATION OF PILLAR COORDINATES AT THE CALIBRATION BASELINE OF THE FACULTY OF GEODESY IN ZAGREB BY APPLYING GPS
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