Thanks for your question.
In WhiteboxTools, the output for all curvature tools report curvature in degrees multiplied by 100 for easier interpretation. The reasoning for this can be found in the following reference:
Gallant, J. C., and J. P. Wilson, 2000, Primary topographic attributes, in Terrain Analysis: Principles and Applications, edited by J. P. Wilson and J. C. Gallant pp. 51-86, John Wiley, Hoboken, N.J.
While doing this allows for easier interpretation, it is can also exaggerate curvature values. It is a good rule of thumb to center the maximum and minimum raster values to something a reduced range and centered on zero (i.e., -100 to 100, -10 to 10, -1 to 1).
Pixel resolution should not have an impact on the units reported. However, if the vertical and horizontal units are not the same in the input DEM, you will have to make use of the Z Conversion Factor(--zfactor) parameter. I have attached a link to the ProfileCurvature Tool in WhiteboxTools for reference (https://jblindsay.github.io/wbt_book/available_tools/geomorphometric_analysis.html#ProfileCurvature)
Hopefully this helps to answer your question.
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