On Fri, Apr 19, 2013 at 09:14:59AM -0400, chris bostick wrote: > I'm having some difficulties using and understanding the output of the ACF > function in the 1D and 2D plots. My goal is to use the ACF function to find > the average height of a matrix array of nanopillars that have a periodicity > of 500 nm
This sounds fishy. Autocorrelation functions expresses how correlated are heights depending the distance, but it is not in any straightforward relation to surface feature dimensions. It is possible to use a correlation search to find a repetitive feature and then obtain its mean or refined shape from the multiple occurences – but this is a completely different use of correlation, and one not implemented in Gwyddion. > Is the output of the ACF plots giving > height or is it giving a variance of height in the image? Something closer to the latter. Without seeing the data[*], I would say you should use grain marking function and then a grain properties function (e.g. grain maximum) to obtain the heights. Regards, Yeti [*] Please don't send data files to the list. It is not intended for that. http://gwyddion.net/faq.php#faq016 ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
