.. _sphx_glr_gallery_rotated_pole.py:


Rotated pole boxes
------------------

A demonstration of the way a box is warped when it is defined
in a rotated pole coordinate system.

Try changing the ``box_top`` to ``44``, ``46`` and ``75`` to see the effect
that including the pole in the polygon has.





.. image:: /gallery/images/sphx_glr_rotated_pole_001.png
    :align: center





.. code-block:: python


    import matplotlib.pyplot as plt

    import cartopy.crs as ccrs


    def main():
        rotated_pole = ccrs.RotatedPole(pole_latitude=45, pole_longitude=180)

        box_top = 45
        x, y = [-44, -44, 45, 45, -44], [-45, box_top, box_top, -45, -45]

        fig = plt.figure()

        ax = fig.add_subplot(2, 1, 1, projection=rotated_pole)
        ax.stock_img()
        ax.coastlines()
        ax.plot(x, y, marker='o', transform=rotated_pole)
        ax.fill(x, y, color='coral', transform=rotated_pole, alpha=0.4)
        ax.gridlines()

        ax = fig.add_subplot(2, 1, 2, projection=ccrs.PlateCarree())
        ax.stock_img()
        ax.coastlines()
        ax.plot(x, y, marker='o', transform=rotated_pole)
        ax.fill(x, y, transform=rotated_pole, color='coral', alpha=0.4)
        ax.gridlines()

        plt.show()


    if __name__ == '__main__':
        main()

**Total running time of the script:** ( 0 minutes  4.977 seconds)



.. container:: sphx-glr-footer


  .. container:: sphx-glr-download

     :download:`Download Python source code: rotated_pole.py <rotated_pole.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: rotated_pole.ipynb <rotated_pole.ipynb>`

.. rst-class:: sphx-glr-signature

    `Generated by Sphinx-Gallery <https://sphinx-gallery.readthedocs.io>`_