Version 0.20 (September 17, 2021)
=================================

For a full list of included Pull Requests and closed Issues, please see the
`0.20 milestone <https://github.com/SciTools/cartopy/milestone/29>`_.

Features
--------

* We have updated the minimum versions of dependencies following the
  guidelines of NEP29. This includes the required dependencies, which are now
  Python>=3.7, GEOS>=3.7.2, shapely>=1.6.4, pyshp>=2.1, numpy>=1.18,
  matplotlib>=3.1, PROJ>=8.0, and pyproj>=3.0

* Stephane Raynaud added the ``cartopy_feature_download.py`` script to the
  installation bundle, making it accessible to everyone and Ruth Comer updated
  the NaturalEarth url to download from the new AWS cloud host.
  (:pull:`1602`, :pull:`1833`)

* Louis Moresi updated the Mapbox API to download from their new endpoints.
  (:pull:`1763`)

* Stephane Raynaud updated the visibility handling for labels (:pull:`1537`)

* @muchjp added the ability for the gridliner to handle shorthand keyword
  arguments (e.g., c for color). (:pull:`1818`)

* Greg Lucas reorganized the documentation and updated the theme to use the
  pydata-sphinx-theme. (:pull:`1652`)

* John Krasting extended the InterruptedGoodeHomolosine projection to add
  an ocean emphasis option. (:pull:`1561`)

    .. plot::
       :width: 400pt

        import matplotlib.pyplot as plt
        import numpy as np
        import cartopy.crs as ccrs

        fig = plt.figure(figsize=(10, 5))
        proj = ccrs.InterruptedGoodeHomolosine(central_longitude=-160,
                                               emphasis='ocean')
        ax = plt.axes(projection=proj)
        ax.stock_img()

        plt.show()

* Max H. Balsmeier updated the GSHHS coastlines that are used by Cartopy.
  (:pull:`1823`)

* Yihe Xu added the ability to adjust the threshold of the projections.
  (:pull:`1815`)

* Rahul Mahajan added an environment variable to point to site-wide data
  installation directories. (:pull:`1827`)

* Alan D. Snow updated Cartopy to use pyproj for coordinate transformations,
  which enables the use of newer PROJ versions. (:pull:`1808`)

* Thomas Grainger and Elliott Sales de Andrade bumped the minimum Python
  dependency to 3.7. (:pull:`1844`)

* Greg Lucas updated the default zorder for features to be 1.5, which is
  above patches and below lines. This is in preparation for a change in
  artist orders with Matplotlib 3.5. (:pull:`1840`)

* Ryan May updated the Geostationary projection boundary to properly
  calculate the boundary ellipse. (:pull:`1829`)

.. figure:: ../gallery/miscellanea/images/sphx_glr_eccentric_ellipse_001.png
   :target: ../gallery/miscellanea/eccentric_ellipse.html
   :align: center