le = class(lat)

             Latitude is measured in radians.  On input, the range of
             latitude is unrestricted.

      alt    Altitude of point above the reference spheroid. Units of `alt'
             must match those of `re'.

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

      re     equatorial radius of a reference spheroid. This spheroid is a
             volume of revolution: its horizontal cross sections are circular.
              The shape of the spheroid is defined by an equat