Did Frank Herbert include a map somewhere in the books? I only found low resolution and hard to read maps on google. The Arrakeen city and surroundings would be most interesting.
Yes, in Dune itself. There's a map centering on the north pole of Arrakis, and surrounding areas, covering pretty much all the action in the novel I can recall. [Pp. 518--519, 1999 Ace hardcover.]
The map in Dune is official. A better version of that map, however, exists in the old Avalon Hill Dune boardgame.