Clean up a section of a mesh of a 3D relief

Hello everyone, I would need help understanding how to clean up the curve obtained by sectioning a mesh of a 3D relief. I would like to remove all the elements above and away from the walls and make the curves smoother without losing resolution.
Thank you in advance.

Survey (8.7 MB)

I think you will be much faster boxing out the walls manually based on this scan.

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