Hi, I am trying to add a DEM I downloaded to my sdf. How do I simulate the DEM without scaling it?

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I gdalwarped it to reduce it's resolution. I am using the same technique described in the tutorial. But the <size> <size> command essentially scales it to whatever height I want. How do I show the true elevations and distances? If I do not include the size specs it prints a tiny surface with very tall and jagged cliffs, which is not representative of the DEM. It looks like Z axis is off on scaling