e is that of the closest point
             to P on the spheroid.

             'lat' is output in radians. The range of 'lat' is given
             by:

                -pi/2  &lt;  lat  &lt;  pi/2
                       -       -

       alt   the value(s) describing the altitude above the
             reference spheroid.

             [1,n] = size(alt); double = class(alt)

             'lon', 'lat', and 'alt' return with the same vectorization
             measure, N, as 'rectan'.

</pre><h4><a name="Ex