I'm trying to create some maps for a book I'm publishing based on the diary of a World War One soldier on the Western Front. It contains a series of hand-drawn maps (done many years after) but I want to re-do the maps in Illustrator to give them a consistent look and feel. I also want to lay them over a toned down shaded relief background. If you're not familiar with the shaded relief, it looks like this:
My question is anyone know a source of these kind of shaded relief maps (or datasets to generate them) that can be re-used - I don't mind paying for them in the first place, but I need to be able to use them royalty free.
On top of the shaded relief maps I need to overlay roads, trenches, gun emplacements, balloon barrages, railways, towns, etc, using Illustrator.
Anyone have experience in doing similar projects? Any advice welcome