def toCartesian(self, Cartesian=Cartesian):
'''Convert this n-vector to a cartesian point.
@keyword Cartesian: Optional, cartesion (sub-)class to use
for the point (L{Cartesian}).
@return: Cartesian equivalent to this n-vector (L{Cartesian}).
@example:
>>> v = Nvector(0.5, 0.5, 0.7071)
>>> c = v.toCartesian() # [3194434, 3194434, 4487327]
>>> p = c.toLatLon() # 45.0°N, 45.0°E
'''
E = self.datum.ellipsoid
x, y, z, h = self.to4xyzh()
# Kenneth Gade eqn (22)
n = E.b / hypot3(x * E.a_b, y * E.a_b, z)
r = h + n * E.a_b**2
return _xnamed(Cartesian(x * r, y * r, z * (n + h)), self.name)
def length(self):
'''Get the length (norm, magnitude) of this vector (C{float}).
'''
if self._length is None:
self._length = hypot3(self.x, self.y, self.z)
return self._length
def length(self):
'''Gets the length of this NED vector (C{meter}).
'''
if self._length is None:
self._length = hypot3(self.north, self.east, self.down)
return self._length
