Question: is wgs84 a projection or datum?
Answer: The North American 1983 datum (NAD83) uses the Geodetic Reference System (GRS80) ellipsoid while the World Geodetic System of 1984 (WGS84) uses the WGS 84 ellipsoid. ... For example, the “WGS84 projection” is a geographic one. A UTM projection is a projected one. Either of these will use only one datum.