The review and development of a modern GNSS network and datum in Uzbekistan

This study is focused on the discussion of a modern GNSS network and datum in Uzbekistan. Considering the significance difference (up to 200 m) in positions of the local ellipsoidal datum and the global datum, the precise transformation parameters between national geodetic datum CS-42, and the World Geodetic System 1984 (WGS84) global datum used by the GPS is estimated. This study aims to evaluate the accuracy of the currently used transformation parameters from different sources in the region, and give preliminary recommendations for using these sets also. The differences between transformed, original and WGS-84 coordinates were calculated and evaluated. On the basis of this difference, different zones for determination of transformation parameters have been proposed.