How to stretch on the Z axis

I am trying to modify an existing heightmap with some texture at small scales. I set up nodes with Perlin noise and combined them with a File Input and a Layout Generator. The result has reduced height. I want to get that height back to exactly what it was before the noise was added. It seems like if I can just stretch out the Z axis, that will be enough. How can I do that in this program? Am I best off adjusting that later?

Ah - I’ve found an option. I changed the Combiner method from average to add. We might need to subtract the added height later, but now there is no distortion. Good.

That’s correct! Average mode will, well, average the two inputs together. if you want to preserve the first input, use Add mode and the second heightfield will be directly added to it.