LAEA_ELL

 Projection     : Lambert Azimuthal Equal-Area
 Also known as  : Zenithal Equal-Area
 General class  : azimuthal
 Characteristics: equal-area
 Earth model    : ellipsoid or sphere

Defining the MAPUNITS:

 MapUnits "laea_ell"     ! Standard name
 MapUnits "laea_ell 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

LAEA_ELL differs from LAEA in that it has the mathematics for the Ellipsoid case, while LAEA only has the mathmatics for the Sphere case. If you use LAEA with an ellipsoid, the software uses the semi-major axis as the radius of the Earth as a Sphere. If you use LAEA_ELL the software works for the Earth as an Ellipsoid rather than simply using the semi-major axis as the radius of a Sphere.

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