Revert "fix/remove broken links"

This reverts commit b8c0e1b.

Author: Conengmo

docs/advanced_guide/geodedetic_image_overlay.md

@@ -102,6 +102,6 @@ TODO: Try [rasterio](https://github.com/mapbox/rasterio/blob/ca75cf0a842943c1b3d
 
 ## Compare to original
 
-From https://scitools.org.uk/cartopy/docs/latest/gallery/scalar_data/waves.html
+From https://scitools.org.uk/cartopy/docs/latest/gallery/waves.html
 
 ![](https://scitools.org.uk/cartopy/docs/latest/_images/sphx_glr_waves_001.png)

docs/advanced_guide/polygons_from_list_of_points.md

@@ -193,7 +193,7 @@ my_envelope_map
 ```
 
 ## Concave hull (alpha shape)
-In some cases the convex hull does not yield good results - this is when the shape of the polygon should be concave instead of convex. The solution is a concave hull that is also called alpha shape. Yet, there is no ready to go, off-the-shelve solution for this but there are great resources.
+In some cases the convex hull does not yield good results - this is when the shape of the polygon should be concave instead of convex. The solution is a concave hull that is also called alpha shape. Yet, there is no ready to go, off the shelve solution for this but there are great resources (see: http://blog.thehumangeo.com/2014/05/12/drawing-boundaries-in-python/, accessed 04.01.2019 or https://towardsdatascience.com/the-concave-hull-c649795c0f0f, accessed 29.12.2018).
 
 
 ## Putting it together
@@ -256,3 +256,17 @@ draw_points(
 folium.LayerControl(collapsed=False).add_to(my_map_global)
 my_map_global
 ```
+
+## Sources:
+
+* http://blog.yhat.com/posts/interactive-geospatial-analysis.html, accessed 28.12.2018
+
+* https://docs.scipy.org/doc/scipy-0.19.0/reference/generated/scipy.spatial.ConvexHull.html, accessed 29.12.2018
+
+* https://www.oreilly.com/ideas/an-elegant-solution-to-the-convex-hull-problem, accessed 29.12.2018
+
+* https://medium.com/@vworri/simple-geospacial-mapping-with-geopandas-and-the-usual-suspects-77f46d40e807, accessed 29.12.2018
+
+* https://towardsdatascience.com/the-concave-hull-c649795c0f0f, accessed 29.12.2018
+
+* http://blog.thehumangeo.com/2014/05/12/drawing-boundaries-in-python/, accessed 04.01.2019

docs/user_guide/geojson/geojson.md

@@ -102,8 +102,8 @@ You can provide a function of the form `lambda feature: {}` that sets the style
 
 For possible options, see:
 
-* For `Point` and `MultiPoint`, see https://leafletjs.com/reference.html#marker
-* For other features, see https://leafletjs.com/reference.html#path and https://leafletjs.com/reference.html#polyline
+* For `Point` and `MultiPoint`, see http://leafletjs.com/reference.html#marker
+* For other features, see http://leafletjs.com/reference.html#path-options and http://leafletjs.com/reference.html#polyline-options
 
 ```{code-cell} ipython3
 m = folium.Map([43, -100], zoom_start=4)