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You can use the length vop from the original surface to the displaced surface and export to an image plane. If you have not changed scene scale, and your model is to correct units, the displacement should be in meters.

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if you go to Edit > preferences > hip file options, you can check if your units are set to 1 meter and 1 kg. (this is standard for houdini). Then IF you modelled to real world scale you will get accurate values in meters as described above by LaidlawFX

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In addition to what Jesper said, even if you don't model to scale, but know the relative conversion ratio of your model the value should be correct. For example, if you are taking terrain data and scaling a mountain to the correct size, you can not do it at real world scale due to precision issue of 32/64 bit precision, however, you can scale your object by a percent and be good enough for CG. 

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I assume 1 meter is one unit within Houdini ? Is it possible to know the real world scale of a mountain ? :) 

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