Homogenisation of GPS fields in cities referring to the new positional datum of the Republic of Croatia

摘要

The paper presents the procedures used in the process of homogenising GPS-networks in the cities referring to the positional datum of the Republic of Croatia. Along with the detailed analysis of previously carried out adjustments in all GPS networks measured and calculated in the period between 1995 and 2003, there have been the geodetic datum and mean epoch of measurement defined for each single GPS-network. After the adjustments of GPS networks according to the least squares method, the analysis of the achieved results, as well as the comparison of coordinates calculated in the old and the new adjustment procedures made in the datum ETRS89 epoch 1989.0 have been carried out.