Has anyone seen a DEM without real 3D?

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I am working with Digital Elevation Models in format TIFF 2km * 2km. As far as I know DEMs should have a 3d function but in my case the DEMs are flat. They only look 3d because of the hill shading. But when I open the DEM in ArcScene it is flat.

How can I turn the DEM into a real 3d modell? How can I see the z values?

Thank you for help



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