South American Datum
| Geodesy |
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The South American Datum (SAD) is a regional historical geodetic datum for South America. The most common version was established in 1969 (SAD69), as adopted by the Pan American Institute of Geography and History.[1]
It uses as
Geodetic Reference System 1967 (GRS-67), recommended by the International Union of Geodesy and Geophysics in Lucerne in 1967.[2]
This ellipsoid acquired topocentric orientation defined at the
This datum was subsequently adopted by many South American countries, including the earlier Brazilian Geodetic System (Sistema Geodésico Brasileiro - SGB). In most countries, SAD was recently replaced by SIRGAS; for example, in Brazil SIRGAS was adopted starting in 2005 and mandated since 2014.[5]
References
- ISSN 0039-6265.
- ^ http://www.iugg.org/resolutions/zurich.pdf [bare URL PDF]
- ^ https://geoftp.ibge.gov.br/informacoes_sobre_posicionamento_geodesico/sirgas/sisref_2.pdf [bare URL PDF]
- S2CID 196088639. Retrieved 2021-07-02.
- ^ "Transformation of Coordinates among Official Referential Systems". IBGE. 2005-02-25. Retrieved 2021-07-02.
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