Swift: Creating a randomized scrolling scene similar to Alto's Adventure

How do the programmers of this game create a randomized game scene where the mountain that I am snowboarding down recreates itself every time. I imagine that they have incorporated GKPerlinNoiseSource to create a randomization effect where the regenerated mountain terrain to the right is affected by what is to the left, that way there are no sudden spikes, like a normal random curve. But I am unsure how you would go from a GKNoise or a GKNoiseMap to a one-dimensional regenerating terrain. This same thing would go for any game where the terrain regenerates itself in a 1-dimensional sequence.

Would you do something different than use a noise source, and what would you recommend? One thing I realize in this game is that many small areas are scenes that are played over in a random order.