Uruguay (UruQGeoide110/UruGeoide110)
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Author: W.H. Subiza Piña, et al.
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Created: 2023
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Resp: W.H. Subiza Piña
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Description:
The Uruguayan gravimetric quasi-geoid model UruQGeoide110 and the corresponding gravimetric geoid model UruGeoide110 were calculated by the Military Geographic Institute (IGM) in 2023. The extent of these two models is from 29.5° S to 35.5° S in latitude, and 52.5° W to 59.5° W in longitude, covering parts of Argentina and Brazil, with a grid resolution of 1´ x 1´. The geodetic reference system is SIRGAS ROU-98 (the reference ellipsoid is GRS80). The input gravity dataset includes the EIGEN-6C4 geopotential model up to degree and order of 720, 10,429 land gravimetric stations and 10,089 free air gravity anomalies in marine areas, based on the DTU13 model. The terrain data at the final 90 m resolution was taken from a 2017 Lidar survey in Uruguay with a 2.5 m initial resolution and SRTM (V2) for the external terrestrial data. The DT18 bathymetry model was used for the marine areas. Due to the total terrain data points (about 104 million), the overall area was divided into 4 overlapped blocks in the framework of the remove-compute-restore procedure. The reduced height anomalies were computed from the reduced gravity anomalies with Stokes 1D FFT and Wong Gore´s kernel modification (170-180 degrees). After adding back the residual terrain model effects and the contribution of the global geopotential model, the obtained quasi-geoid model (UruQGeoide110) was transformed into a geoid model (UruGeoide110) via Bouguer anomalies, even if the difference between the two models is just a few mm. A comparison with 51 GNSS/levelling stations shows a standard deviation of 10 cm. The UruQGeoide110 and UruGeoide110 models with some applications are available at the IGM webpage.
Model Citations:
W.H. Subiza Piña (2023). The Uruguayan gravimetric quasi-geoid: UruQGeoide110. V. 1.0. GFZ Data Services. DOI: 10.5880/isg.2023.001
W.H. Subiza Piña (2023). The Uruguayan gravimetric geoid: UruGeoide110. V. 1.0. GFZ Data Services. DOI: 10.5880/isg.2023.002
Reference:
Servicio Geografico Militar (2023). UruGeoide110. Report of Servicio Geografico Militar, Montevideo, Uruguay.
Digital object identifiers:
DOI: 10.5880/isg.2023.001 (quasi-geoid in ISG format)
DOI: 10.5880/isg.2023.002 (geoid in ISG format)
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