USGG2012 is a refined gravimetric model of the geoid in the United States and other territories, which supersedes the previous models USGG2009 and USGG2003.
For USGG2012 in CONUS regions, heights range from a low of -52.53 meters (magenta) in the Atlantic Ocean to a high of 3.47 meters (red) in the Labrador Strait.
USGG2012 refers to a GRS 80 ellipsoid, centered in the IGS08 (2005.00) reference frame, and is the best geopotential surface that approximates Mean Sea Level (MSL).
USGG2012 is NOT for converting between NAD83 and NAVD88.
USGG2012 is suitable for use with WGS84 and scientific applications.
