Sarcee Trail is the ring road, yes.
You can see it on this green map. I think you have a photograph as well. I don't have the full package with me, but if you look at your map, you'll see you have a photograph as well that shows you Signal Hill, which is the dividing line.
Calgary is essentially a bowl that has very large hills around it. Sarcee Trail is the dividing line. Signal Hill is this large bluff that overlooks the city on the other side of the ring road.