South American Datum

Geodesy
Fundamentals
Geodesy Geodynamics Geomatics Cartography History
Concepts
Geographical distance Geoid Figure of the Earth Geodetic datum Geodesic Geographic coordinate system Horizontal position representation Latitude / Longitude Map projection Reference ellipsoid Satellite geodesy Spatial reference system
Technologies
Global Navigation Satellite System (GNSS) Global Positioning System (GPS) GLONASS (Russian) BeiDou (BDS) (Chinese) Galileo (European) Indian Regional Navigation Satellite System (IRNSS)
Standards
ED50 European Datum 1950 SAD69 South American Datum 1969 GRS 80 Geodetic Reference System 1980 NAD83 North American Datum 1983 WGS84 World Geodetic System 1984 NAVD88 N. American Vertical Datum 1988 ETRS89 European Terrestrial Reference System 1989 GCJ-02 Chinese encrypted datum 2002 International Terrestrial Reference System Spatial Reference System Identifier (SRID) Universal Transverse Mercator (UTM)
History
NGVD29 (Sea Level Datum 1929)

The South American Datum (SAD) is a regional geodesic datum for South America. It was established in Brazil by SIRGAS 2000, and was made official in 2005.

SAD69

SAD was established as the regional geodetic datum for South America in 1969. This datum includes the Brazilian Geodetic System (Sistema Geodésico Brasileiro, or SGB), and uses the geoid as defined by the ellipsoid of the Geodetic Reference System - SGR-67 - accepted and recommended by the International Union of Geodesy and Geophysics at Lucerne in 1967. This ellipsoid is defined from the parameters:

• Topocentric orientation:
  • an axis of rotation parallel to the Earth's axis of rotation; plan meridian parallel to the Greenwich Meridian;
• Topocentric orientation: considered planimetric datum, the Vertex Chuá chain triangulation of parallel 20° South, in Minas Gerais:
  • geodetic latitude = 19° 45' 41.6527" S
  • astronomical latitude = 19° 45' 41.34" S
  • geodetic longitude = 48° 06' 04.0639" W
  • astronomical longitude = 48° 06' 07.80" W
  • Geodetic Azimuth = 271° 30' 04.05" SWNE; Astronomical Azimuth = 271° 30' 05.42" SWNE for VT-Uberaba
  • geodetic undulation N = 0.0 meters
• SGB Altimetry datum coincides with the equipotential surface that contains the mean sea level, defined by the tide gauge observations taken in Imbituba, on the coast at Santa Catarina.