.. py:function:: value2s(gpt)
Returns the values in the **value2** column of ``gpt``.
:param gpt: input geopoints
:type gpt: :class:`Geopoints`
:rtype: ndarray
.. warning::
:func:`value2s` only works for :class:`Geopoints` with 'xy_vector' or 'polar_vector' type.
.. mv-minigallery:: value2s