Optimal landscape elevation based height gradient

Yep.
And the solid color probably makes sense, as you don’t really know what the original high and low values actually are.

Because the landscape dips below 0, you probably need to Max Range or do something similar based on a custom scalar for height and it’s negative value for the opposite.

Maybe this.
Wpo > B > max range clamped.
Scalar for height in A,
-1 * scalar height in B.
(The outputs should always be 0 to 1)

Then you adjust the scalar in the instance to match your highest peak (Values In CM).

See how that works.

If you are looking at the heightmap, may as well note that it’s PNG16 - with the highest value being 65535. Sea level being 65535/2 and the absolute lowest being 0. These values are scaled by the map Z scale at a specific ratio.
Look up the docs since for once I managed to get epic to update something with useful info.

Point being, you can calculate your highest possible peak mathematically - maybe even within the material itself.