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So I am having some issues getting my USGS DEM to display in 3d in ArcScene. I downloaded my DEM (.jpg) and brought it into ArcScene. I clicked properties and base heights and floating on a custom surface, and then after accepting, the DEM is still completely flat.

What am I doing wrong?

I thought I had already put it into a projected coordinate system.

What coordinate system is it in when I download it from USGS?

How would I change it correctly?

What I am trying to do ultimately is use the 3d elevations for a flood simulation.

closed as unclear what you're asking by user2856, HDunn, BERA, JGH, whyzar Oct 29 '17 at 13:17

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • As per the Tour there should be only one question asked per question. – PolyGeo Oct 28 '17 at 20:41
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    A .jpg is not a DEM. You likely have a rendered image without elevation. Can you edit your question and specify exactly what you downloaded. – user2856 Oct 29 '17 at 6:07
  • It's rare for a DEM to be stored in a lossy 8-bit format. Usually they are single-band 16-bit rasters with lossless compression (LZ77, etc). Please edit the question to provide a great more detail about the raster in question. – Vince Oct 29 '17 at 13:40
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A few possibilities I can think of:

First, maybe it's already in 3D, and you just need to view it from a different angle/perspective by e.g. using the mouse to rotate the scene.

Second, maybe the variation in elevation is too small as compared to the extent of your DEM. You may want to try change the vertical exaggeration or z-factor.

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