Hi,
I want to use gwiddion to measure the RMS roughness of the facets of a
terraced sapphire substrate. I have saved my AFM data without processing
and find that the only way to get a reasonable image is by using the
"correct lines by matching median height" icon. I'm having a little
trouble finding documentation on this function and would like to know
1) What does this function do exactly?
2) Is it valid to apply this function before calculating the RMS roughness
of a leveled facet? I think that this tool corrects for jump
discontinuities in the slow scanning axis, which seems like a reasonable
thing to do, but certainly the medians of all lines should not be equal?
How would the application of this function effect the RMS value that I
calculate?
3) Right now I'm using the line median correction and scarring correction
buy clicking them repeatedly until there is no change in the image. Then I
do 3 point leveling with the triangle icon on a facet. Finally I select an
area on the facet and measure the RMS roughness. Is this a reasonable
procedure?
I'm pretty new to AFM so any response that explains the fundamentals
necessary to answer these questions would be most appreciated.
Thanks a lot,
-Ben
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