AE

 Projection     : Azimuthal Equidistant
 Also known as  : Zenithal Equidistant
 General class  : azimuthal
 Characteristics: neither equal-area nor conformal
 Earth model    : sphere

Defining the MAPUNITS:

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

Other parameters:

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

Possible errors:

 E335, "Point projects into a circle" - In converting from
        geographic coordinates to projection coordinates, 
        the point projects into a circle.
 E100, "Invalid data" - In converting from projection coordinates
        to geographic coordinates, there was an input data error