I would offer to take over making copies of the maps but I must say that even Data finds my artwork lacking. I would have Data himself make a copy of the maps you do have, crude or not. Perhaps he could even clean them up a bit as he did show a flare for artistry aboard the Enterprise.
[He's surprised to hear of the cattle and grasslands and even more buildings beneath this surface.] I suppose we should focus more on the mainframe access than on the cattle and grassland.
[Although he's suddenly been hit with another idea.] Have you ever heard of a tricorder?