.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_gallery_arrows.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_arrows.py:


Arrows
------

Plotting arrows.





.. image:: /gallery/images/sphx_glr_arrows_001.png
    :class: sphx-glr-single-img





.. code-block:: python


    import matplotlib.pyplot as plt
    import numpy as np

    import cartopy.crs as ccrs
    import cartopy.feature as cfeature


    def sample_data(shape=(20, 30)):
        """
        Return ``(x, y, u, v, crs)`` of some vector data
        computed mathematically. The returned crs will be a rotated
        pole CRS, meaning that the vectors will be unevenly spaced in
        regular PlateCarree space.

        """
        crs = ccrs.RotatedPole(pole_longitude=177.5, pole_latitude=37.5)

        x = np.linspace(311.9, 391.1, shape[1])
        y = np.linspace(-23.6, 24.8, shape[0])

        x2d, y2d = np.meshgrid(x, y)
        u = 10 * (2 * np.cos(2 * np.deg2rad(x2d) + 3 * np.deg2rad(y2d + 30)) ** 2)
        v = 20 * np.cos(6 * np.deg2rad(x2d))

        return x, y, u, v, crs


    def main():
        fig = plt.figure()
        ax = fig.add_subplot(1, 1, 1, projection=ccrs.Orthographic(-10, 45))

        ax.add_feature(cfeature.OCEAN, zorder=0)
        ax.add_feature(cfeature.LAND, zorder=0, edgecolor='black')

        ax.set_global()
        ax.gridlines()

        x, y, u, v, vector_crs = sample_data()
        ax.quiver(x, y, u, v, transform=vector_crs)

        plt.show()


    if __name__ == '__main__':
        main()

**Total running time of the script:** ( 0 minutes  0.011 seconds)


.. _sphx_glr_download_gallery_arrows.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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


.. only:: html

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

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