The computation of the Geoid N for the Brazil was carried out in 2011 with the DFHRS-software version 4.2 in a cooperation between IAF/HSKA and the Instituto Brasileiro de Geografia e Estatística (IBGE) Rio de Janeiro. The computations were done at he Geomatics Department of HSKA in the frame of the masterthesis of M.Güldenpfenning, titled Computation and Quality Assessment of Datum-Transformation and Geoid Databases as Basic Components of the Geodetic Infrastructure (GIPS) for the GNSS-Positioning Service of Brazil. Fig. 1 shows the mesh and patch design of the computation design. The result of a closed continuous QGeoid over Brasil has an accuracy of 3-10 cm.
The DFHRS-database Brazil is ready for the use on GNSS-controllers an for setting up the RTCM height transformation message for GNSS positioning service providers in Brazil (www.moldpos.eu, www.geozilla.de). Fig.2 shows the isoline plot of the computed Brazil Geoid N.