San Juan Province - Argentina (OAFAQG_2025)
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Authors: A.R. Gómez, et al.
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Created: 2025
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Resp: A.R. Gómez
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Description:
OAFAQG_2025 is a local, high-precision, high-resolution, pure-gravimetric quasigeoid model developed for the area surrounding OAFA and UNSJ, two International Height Reference Frame (IHRF) stations located in the Province of San Juan, Argentina, covering latitudes 34°S to 30°S and longitudes 70.5°W to 65.5°W, with a 0.03° grid resolution. The model’s purpose is to determine the IHRF vertical coordinate at these stations. Its computation followed Molodensky’s formulation of the Geodetic Boundary Value Problem (GBVP) and employed the remove–compute–restore (RCR) strategy. Long-wavelength components were modeled using the XGM2019e Global Geopotential Model (GGM) up to degree and order 840. Topographic contributions were modeled via Residual Terrain Modeling (RTM) using the SRTM v4.1 Digital Elevation Model (DEM). Residual height anomalies were calculated with either the 1D-FFT technique incorporating the Wong–Gore modification of Stokes’ kernel or the Least-Squares Collocation (LSC) technique. All computational steps were performed with the GRAVSOFT software package. Validation against 188 GNSS/leveling points yielded an estimated precision of 0.170 m for the FFT solution and 0.172 m for the LSC solution, both after applying a four-parameter fit.
Reference:
A.R. Gómez, C. Tocho, E.D. Antokoletz, S.R. Cimbaro (2025). Local quasigeoid modeling at Argentinean stations of the International Height Reference Frame (IHRF). Journal of Geodesy, 99, 94. DOI: 10.1007/s00190-025-02018-5
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