Development of Transformation Parameters Data Base for MOLDPOS Service

Starting from 1999 a new Moldavian Reference System (MOLDREF99) based on the ETRS89 and Transversal Mercator for Moldova map projection was established. In order to provide real time position and navigation service on the territory of Republic of Moldova in 2011 GNSS Permanent Network and MOLDPOS service was developed. Taking in account that RTCM 3.1 transformation messages allows the MOLDPOS service to provide their users with all necessary data for positioning a grid transformation parameters data base from combined classical triangulation SC42 to MOLDREF99 and vice versa was developed, using a new method of grid calculation and interpolation of Helmert transformation parameters. Case study in the central part of Moldova showed centimeters level accuracy of coordinate's transformations from SC42 datum to MOLDREF99 and inverse.