Update more outdated links in docs

Author: molinav

packages/basemap/doc/source/users/examples.rst

@@ -32,7 +32,7 @@ For more specifics of how to use the Basemap instance methods,
 see :ref:`api-index`.
 
 Here are the examples (many of which utilize the 
-`netcdf4-python <http://unidata.github.io/netcdf4-python/>`__ module
+`netcdf4-python <https://unidata.github.io/netcdf4-python/>`__ module
 to retrieve datasets over http):
 
 * Plot contour lines on a basemap
@@ -56,7 +56,7 @@ to retrieve datasets over http):
 
 .. plot:: users/figures/plotetopo5.py
 
-* Plot markers at locations of `ARGO <http://www.argo.ucsd.edu/>`__ floats.
+* Plot markers at locations of `ARGO <https://www.argo.ucsd.edu/>`__ floats.
 
 .. plot:: users/figures/plotargo.py
 

packages/basemap/doc/source/users/geography.rst

@@ -7,7 +7,7 @@ Basemap includes the GSSH (now
 `GSHHG <https://www.soest.hawaii.edu/pwessel/gshhg/>`_)
 coastline dataset, as well as datasets for rivers, state and
 country boundaries from 
-`GMT <http://gmt.soest.hawaii.edu>`_.
+`GMT <https://www.generic-mapping-tools.org/>`_.
 These datasets can be used to draw coastlines, rivers and political
 boundaries on maps at several different resolutions.  The relevant Basemap 
 methods are:
@@ -36,13 +36,13 @@ used as a map background.  Basemap provides several options for this:
   mask is derived from the GSHHS coastline data, and there are several 
   coastline options and pixel sizes to choose from.
 * :func:`~mpl_toolkits.basemap.Basemap.bluemarble`: draw a NASA
-  `Blue Marble <http://visibleearth.nasa.gov/view_set.php?categoryID=2363>`_
+  `Blue Marble <https://visibleearth.nasa.gov/images/73726/june-blue-marble-next-generation-w-topography-and-bathymetry>`_
   image as a map background.
 * :func:`~mpl_toolkits.basemap.Basemap.shadedrelief`: draw a  
-  `shaded relief <http://www.shadedrelief.com>`_ image
+  `shaded relief <https://www.shadedrelief.com/>`_ image
   as a map background.
 * :func:`~mpl_toolkits.basemap.Basemap.etopo`: draw an  
-  `etopo <http://www.ngdc.noaa.gov/mgg/global/global.html>`_
+  `etopo <https://www.ngdc.noaa.gov/mgg/global/global.html>`_
   relief image as map background.
 * :func:`~mpl_toolkits.basemap.Basemap.warpimage`: use an abitrary
   image as a map background.  The image must be global, covering the