One of the current goals of the Global Geodetic Observing System (GGOS) through the International Association of Geodesy (IAG) is the unification of the existing classical vertical datums towards the materialization of the International Height Reference System (IHRS). In order to achieve this goal, it is possible to compute the mean geopotential offset between the equipotential surface of the Earth’s gravity field realized by the conventional value of the IHRS and the unknown geopotential value of the local vertical datum. This offset is known as the vertical datum parameter.In this study, the determination of the discrepancy between the Argentinean National Vertical Reference System 2016 (SRVN16) over the continental part of Argentina and the IHRS is presented. With this objective, the zero-height geopotential value for the Argentinean Local Vertical Datum W0LVD was determined based on two approaches: 1) Using high-quality GNSS/Levelling data and a local gravimetric geoid model; and 2) Combining orthometric heights from SRVN16 with geoid heights through a Least Squares adjustment, integrating terrestrial gravity data for a specific area in Argentina. In both approaches, the local gravimetric geoid was computed by the well-known remove-compute-restore technique and applying a Fourier representation of Stokes’ integral formula.Preliminary analysis was carried out in a flat area in Buenos Aires province due to availability of high-quality data, gravity observations and benchmarks with GNSS/Levelling-derived heights, all located near the tide gauge station used to define the Argentinean Vertical Datum.

The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)