DOC: Change Stamen image tiles over to Google

This changes examples that used Stamen over to Google. The Stamen
versions are no longer accessible without an API key, so switching
over to a public tile server is the easiest fix for now.

examples/lines_and_polygons/effects_of_the_ellipse.py

@@ -23,7 +23,7 @@
 
 import cartopy.crs as ccrs
 import cartopy.feature as cfeature
-from cartopy.io.img_tiles import Stamen
+from cartopy.io.img_tiles import GoogleTiles
 
 
 def transform_fn_factory(target_crs, source_crs):
@@ -57,8 +57,8 @@ def main():
                                            name='coastline',
                                            scale='10m')
 
-    # Create a Stamen map tiler instance, and use its CRS for the GeoAxes.
-    tiler = Stamen('terrain-background')
+    # Create an image tiler instance, and use its CRS for the GeoAxes.
+    tiler = GoogleTiles(style="satellite")
     fig = plt.figure()
     ax = fig.add_subplot(1, 1, 1, projection=tiler.crs)
     ax.set_title('The effect of incorrectly referencing the Solomon Islands')
@@ -69,7 +69,7 @@ def main():
     ax.set_extent(extent, geodetic)
     geoms = list(dataset.intersecting_geometries(extent))
 
-    # Add the Stamen aerial imagery at zoom level 7.
+    # Add the aerial imagery at zoom level 7.
     ax.add_image(tiler, 7)
 
     # Transform the geodetic coordinates of the coastlines into the two

examples/scalar_data/eyja_volcano.py

@@ -3,7 +3,7 @@
 --------------------
 
 Demonstrates cartopy's ability to draw map tiles which are downloaded on
-demand from the Stamen tile server. Internally these tiles are then combined
+demand from the Google tile server. Internally these tiles are then combined
 into a single image and displayed in the cartopy GeoAxes.
 
 """
@@ -15,19 +15,19 @@
 
 
 def main():
-    # Create a Stamen terrain background instance.
-    stamen_terrain = cimgt.Stamen('terrain-background')
+    # Create a background image tile.
+    google_terrain = cimgt.GoogleTiles(style="satellite")
 
     fig = plt.figure()
 
     # Create a GeoAxes in the tile's projection.
-    ax = fig.add_subplot(1, 1, 1, projection=stamen_terrain.crs)
+    ax = fig.add_subplot(1, 1, 1, projection=google_terrain.crs)
 
     # Limit the extent of the map to a small longitude/latitude range.
     ax.set_extent([-22, -15, 63, 65], crs=ccrs.Geodetic())
 
-    # Add the Stamen data at zoom level 8.
-    ax.add_image(stamen_terrain, 8)
+    # Add the tile data at zoom level 8.
+    ax.add_image(google_terrain, 8)
 
     # Add a marker for the Eyjafjallajökull volcano.
     ax.plot(-19.613333, 63.62, marker='o', color='red', markersize=12,

examples/web_services/image_tiles.py

@@ -9,11 +9,11 @@
 import matplotlib.pyplot as plt
 
 import cartopy.crs as ccrs
-from cartopy.io.img_tiles import Stamen
+from cartopy.io.img_tiles import GoogleTiles
 
 
 def main():
-    tiler = Stamen('terrain-background')
+    tiler = GoogleTiles(style="satellite")
     mercator = tiler.crs
 
     fig = plt.figure()