What is the satellite-determined ellipsoid used for the Geodetic Reference System 1980 known as?

The satellite-determined ellipsoid used for the Geodetic Reference System 1980 is known as GRS80. This system was established to provide a global framework for geodetic measurements and is based on a specific ellipsoid that approximates the shape of the Earth. The GRS80 ellipsoid is characterized by its semi-major and semi-minor axes, which help in accurately defining geographic coordinates.

The significance of GRS80 lies in its use as a reference surface for geodetic positioning, serving as a foundation for various applications, including mapping and navigation. It is also compatible with the North American Datum of 1983 (NAD83), which further extends its relevance in geospatial contexts.

Other options, while relevant in their own right, pertain to different geodetic systems or are not specific ellipsoids used for the GRS80. WGS84, for instance, is a global reference system that is widely used for GPS and other global navigation satellite systems but is a distinct system from GRS80. AGD66 relates to the Australian Geodetic Datum established in 1966, which has no connection to the GRS80. EPSG is a database of coordinate reference systems and transformations, which does