Salta Province - Argentina (UNSAQG_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:
UNSAQG_2025 is a local, high-precision, high-resolution, pure-gravimetric quasigeoid model developed for the area surrounding UNSA, an International Height Reference Frame (IHRF) station located in the Province of Salta, Argentina, covering latitudes 26.5°S to 24.5°S and longitudes 66°W to 64°W, with a 0.03° grid resolution. The model’s purpose is to determine the IHRF vertical coordinate at this station. 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 800. Topographic contributions were modeled via Residual Terrain Modeling (RTM) using the SRTM v4.1 Digital Elevation Model (DEM). Residual height anomalies were calculated with the either 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 51 GNSS/leveling points yielded an estimated precision of 0.124 m after applying a four-parameter fit for both processing techniques.
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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