I believe the maps are transformative. They are certainly not copied whole cloth. For instance, I am using someone else's image of a tree, pasting it several times, rotating it and making other, small modifications, then adding other elements (some rocks, grass, ect) to create a forest. Does that qualify?
I am not seeking to make money from these maps. I simply wanted to share them since I thought others might be able to use them at their own tables for their own games.
All of the images I used were freely available on the internet. I realize that does not necessarily give me any rights to them. It does suggest that I am not depriving any of the IP owners of revenue though.