While working on the Travelers’ Guide for Legends of Okoto, I decided it’d be useful to include a map of the island. Since I didn’t think the overhead pictures would be appropriate, I decided to trace one to make something that would look more like a hand-drawn map. This is the result.
Use a drawing program with layers, put the official image on the bottom layer, trace on the top layer, and then make the bottom layer invisible. Embellish it a little and you’ve got a map.