SGDO

 Projection     : Stereographic Double
                : rectangular coordinates (New Brunswick, Canada)
                : rectangular coordinates (Prince Edward Island, Canada)
 Also known as  : Double Stereographic
 General class  : azimuthal
 Characteristics: conformal
 Earth model    : ellipsoid or sphere

Defining the MAPUNITS:

 MapUnits "sgdo"     ! Standard name
 MapUnits "sgdo e19" ! Standard name and ellipsoid

Other parameters:

 TrueOriginLongitude "longitude_of_origin"  ! Required, for True origin
 TrueOriginLatitude  "latitude_of_origin"   ! Required, for True origin
 Scale               "scale_at_origin"      ! Optional, default is one
 FalseEasting        "false_easting"        ! Optional, default is zero
 FalseNorthing       "false_northing"       ! Optional, default is zero