vertical datumSouth AmericaAfter the excellent results obtained in the establishment of the South American geocentric reference system (SIRGAS) in 1995, which serves mainly for the unification of the national horizontal datums, there was the need of installing also a unified vertical datum. SIRGAS ...
The project structure includes an Executive Committee made up by the representatives of all participating countries and international institutions, a Directive Board, a Scientific Council, and three Working Groups (WGs): WGI “Reference Systems”, WGII “Geocentric Datum”, WGIII “Vertical Datum”....
The normal equations were then accumulated and solved in a final combination where the coordinates and velocities of selected stations are weighted for the datum definition compatible with ITRF2000. The estimated velocities of the north Chilean Andes regions are 26–30 ± 2mm/yr, decreasing up to ...
SIRGAS-WGII (Geocentric Datum) is primarily in charge of realising the SIRGAS geodetic datum in the individual countries, which is given by the origin, orientation and scale of the SIRGAS system, and the parameters of the GRS80 ellipsoid. SIRGAS-WGII is concentrating on promoting and ...