def unit(self, ll=None):
'''Normalize this n-vector to unit length.
@kwarg ll: Optional, original latlon (C{LatLon}).
@return: Normalized vector (C{Nvector}).
'''
if self._united is None:
u = Vector3d.unit(self, ll=ll) # .copy()
self._united = u._united = _xattrs(u, self, '_h')
return self._united
def _latlon5(self, LatLon, **LatLon_kwds):
'''(INTERNAL) Convert cached LatLon
'''
ll = self._latlon
if LatLon is None:
r = LatLonDatum5Tuple(ll.lat, ll.lon, ll.datum, ll.convergence,
ll.scale)
else:
_xsubclassof(_LLEB, LatLon=LatLon)
kwds = _xkwds(LatLon_kwds, datum=ll.datum)
r = _xattrs(LatLon(ll.lat, ll.lon, **kwds), ll, '_convergence',
'_scale')
return _xnamed(r, ll.name)