In dwarf fortress, there are 3 levels of maps in the screen you pick your starting position, and they all coincide with each other perfectly. I am assuming that the top level tile accounts for lets say 36 smaller map blocks, and when the player spawns on the map, that is just a noise value at a different level or frequency of even more tiles.
The selection screen looks like this:
How is such a level of coherence achieved? It doesn't seem like simply adjusting noise frequency/octave values would work perfectly, or maybe it does, I am just not grasping the workflow properly?