The method of transformation of three-dimensional positions of points between geocentric and reference coordinate systems for regional territories

A technique was developed for converting three-dimensional positions of points for regional territories between geocentric and reference coordinate systems (RCS) by matching the Helmert parameters with the geoid height model for the reference coordinate system and the three-dimensional positions of points in both SC. The technique is based on replacing the quasigeoid height model to the EGM2008 geoid height model transformed for reference coordinate systems. For regional territories, the accuracy of determining the Helmert parameters and the accuracy of transformations of coordinates and heights of points at the level of accuracy of the positions of points in the general and reference coordinate systems is ensured. Examples of calculations of the agreed Helmert parameters with the transformed elevation model of the EGM2008 geoid between the reference coordinate system SK-95 and WGS-84, SK-42, GSK-2011 for the territory of the Novosibirsk region are given.