From Wikipedia, the free encyclopedia
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
reference ellipsoid
the
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
astrogeodetic
vertex
Chua
, in the municipality of
Uberaba
, Brazil.
[3]
[4]
This datum was subsequently adopted by many South American countries, including the earlier
Brazilian Geodetic System
(
Sistema Geodesico 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
[
edit
]