Satellite imagery in the 19th century?
They didn't have satellite imagery in World War 2 either but there you are.
I'll give you a simple example...
While playing the game, you scroll out (using either the mouse wheel, or key), and soon you see that you are inside a tent, hey it's Lee's tent. The map is laying on a table with other maps strewn about, and you see the some other articles which commanders would have in the tent such a bed (whatever they had in their tents back then), etc (hey cool), and you also see men standing around the table looking over the map. As you were panning out you would see clouds pass over, and you are watching your battle unfold before you... This is simply for absolute cool factor, and it does serve a function since I am very sure that maps were on tabletops back then (if realism is your thing)... See what I am trying to say?
For me I wouldn't mind having this option to move about the map, it's not only cool to have but very easy on the eyes, and easy to command your troops (moving them around the map). The zoom out like in R.U.S.E is pretty handy tool, it's shows you the layout of the land, etc, etc...
Each to his own...