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In Poland in the last decade, and particularly since June 2008, when the nationwide, multi-function system of precise satellite positioning – ASG-EUPOS, managed by the Head Offi ce of Geodesy and Cartography was launched, very clearly the use of measurement technology GNSS (Global Navigation Satellite System) has increased. Now, in principle, there is no geodetic company, which would not be equipped with this modern technology of measurements. Coordinates of the reference station of ASG-EUPOS system, were determined with high precision (this system is currently: PL-ETRF2000 for the epoch 2011.0) and now constitute the basic state geodetic network in Poland. Due to the fact, that the network covers all the area of the country, and the GNSS technology theoretically has no limitations on the range of satellite measurements, this allows its broad utilization as a multifunction network, suitable for performing local measurements. The system provides to users three services in real-time positioning (NAWGIS, KODGIS, NAWGEO) and two post-processing services (POZGEO and POZGEO-D). POZGEO service enables automatic post-processing of the observations submitt ed by the user based on selected reference stations using a special application. Particularly noteworthy is the service POZGEO-D, which provides the offi cial coordinates of the station and allows for the acquisition of observational data from any physical reference station of the system as well as a virtual reference station, which can be created at the request of the user of the system, basically anywhere. These observations after processing them in the appropriate software along with the coordinates of the stations may be used to refer various types of geodetic networks created for economic purposes in that realization networks for diff erent types of objects. This approach ensures high accuracy, uniform scale and orientation of

geomatics and environmental engineering

The Use of Virtual Reference Station of the Multifunctional Positioning System ASG-EUPOS to Optimize the Reference Layout of the Basic Realization Network.