On Mon, Jul 09, 2012 at 12:37:43PM +0200, Martin Engler wrote:
> Thanks for the information. It would be nice if you can state this in
> the documentaion.
I would say the first formula in
http://gwyddion.net/documentation/user-guide-en/statistical-analysis.html#power-spectral-density-1d
without any 2π in the exponents makes it quite clear that k is circular
spatial frequency.
Considering the value normalisation, this is also discussed on pages 17
to 21 in the roughness evaluation talk at
http://gwyddion.net/presentations/
Regards,
Yeti
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