Systematical Analysis of the Transformation Between Gauss-Krueger-Coordinate/DHDN and UTM-Coordinate/ETRS89 in Baden-Wurttemberg with Different Estimation Method

For the concrete "Introduction of ETRS89 into Baden-Wurttemberg" the transformation which transforms the existing two-dimensional Gauss-Krueger coordinates in German geodetic reference system (DHDN) into UTM coordinates in the ETRS89 datum with the models of the 7-parameter Helmert transformation and the 6-parameter affine transformation using the 131 collocated points (131 BWREF points in Baden-Wurttemberg) are tested and discussed. Because of the special characteristic of the main triangulation network in Baden-Wurttemberg (state-wide variable net scales, inhomogeneous point accuracies and network distortions in the decimetre level) an alternative transformation procedure based on the polynomial model is performed. Further more the Total Least-Squares method is also applied in estimating the parameters of the 6-parameter affine-transformation based on the 131 collocated points. The result is analysed and compared with these results of the conventional LS method. A systematic analysis of the transformation results is concluded.