National GPS Network (OGPSH)

The Satellite Geodetic Observatory of FÖMI, Penc is the centre for the Hungarian GPS Network activities given below:

• 9 sites of Hungarian part determined in EUREF Network (1991 and 2002),

• 24 sites of the OGPSH frame network,

• 1153 sites of the OGPSH measured all over the country (Fig. 6.).

Fig. 6
Sites of the National GPS Network (OGPSH), Hungary

The coordinates of the OGPSH sites are available in the 3D spatial ETRS89 (epoch 2002) reference system, as well as determined in the EOV projection system for mapping purposes.

An OGPSH Database was created and is operated by FÖMI. The database contains the most important data of the GPS control sites as site identifier, the EUREF and the EOV vertical and horizontal co-ordinates as well as the site location (county, settlement and sheet number), textual description and scanned site sketch (Fig. 8.).

Fig. 8.
Description of the OGPSH network sites (Masked with English translation)

The superior accuracy of the OGPSH allows the analysis of the traditional EOVA network. A comparison and analysis have been performed using a simplified 7 parameter Helmert transformation. The horizontal residuals after transformation are shown in Fig. 7. The maximal residuals are about 0.5 meters at the edge of the network.

Fig. 7.
Horizontal residuals of the OGPSH and EOV networks