Base Maps
The Base Maps come from a number of different sources:
Natural Earth Bathymetry Raster
Natural Earth Gray Shaded Relief and Bathymetry
NASA Blue Marble Next Generation
NASA Blue Marble Next Generation with Topography and Bathymetry
NASA Bathymetry
NASA Black Marble
Others were made by me, using the Mapability.Com CPT Designer program. Some were made with just a plain black or white image, to which shaded relief was added. Most of the maps have extra shaded relief added, at a variety of settings. If you have any ideas for new base-maps, please let me know.