false easting

listen to the pronunciation of false easting
English - English
A value relating to distance east of a standard meridian but with a constant added to make the numbers convenient. For instance, in UTM the value 500,000 is added to the easting from the center of each zone to return a false easting that is never negative (the smallest true easting is approximately -340,000 which set to false easting of 160,000)
A value applied to the origin of the map projection to change the x-coordinate readings
An offset in the x-component of the origin of projection so that no negative x-values occur for coordinates of features on a map
an offset between the y-origin of a map projection and the y-origin of a map Usually used so that no y-coordinates are negative