[haihaibye]

Not sure of the resolution but the easiest solution would be wallpaper. Googling "world map wallpaper" returns quite a lot of results, eg:

http://st.houzz.com/simgs/31e1e6fa0fd87c96_4-7734/contempora...

[jannes]

The picture you linked is clearly a 3D rendering and not an actual photo.

[haihaibye]

Yes it is, it wasn't obvious on my phone...

Another one: https://www.walldecalcompany.com/product_images/x/995/world_...