Metadata Details: Serbian spatial geodetic reference network - SREF

Serbian spatial reference network (SREF) implicitly defines the official national coordinate system, which is managed by the Republic Geodetic Authority. The SREF network consists of 838 points, which are permanently stabilized and evenly distributed throughout the territory of the Republic of Serbia, at an average distance of 10 km. Field GNSS measurements at SREF network points were performed using the relative static positioning method. The coordinates of the SREF points were estimated by post-processing linearly independent vectors and conducting the least squares GNSS adjustment at the given EUREF points, which are characterized by a high degree of positional stability. The ECEF coordinates of the SREF points are defined in the European terrestrial reference frame ETRF2000 (ETRS89 realization).

The history of the previous ETRS89 system realization in the Republic of Serbia dates back to 1998. Within the EUREF Balkan`98 campaign, GPS measurements were performed in Albania, Bosnia and Herzegovina and Yugoslavia (today Serbia and Montenegro, separated) between September 4th and 9th, 1998 at 29 stations. Among those points, 6 points are located in Serbia. The Serbian part of the EUREF GNSS passive network called YUREF98 was densified in the following years with 838 points from the SREF project which cover the whole country in a 10km grid approximately. The estimated horizontal RMS of the reference points obtained from the SREF network least square adjustment is approximately 1 cm, while the aposteriori RMS height error of SREF points is in the interval of 2-3 cm.

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