Hello
I find the 60 by 60 minimum selection to build a profile limiting.
Sometimes this is not possible. It would be good to have non square selections,distortable to parallelograms or trapeziods to make up the minimum sample area.
Mike Engles
Selections
NI needs a rectangular area to analyze. Making it small, irregular, distorted, etc. leads to less accurate filtration. Easier solution is to use another image. - You can take a sample from another image if current one has no large featureless areas. There are many options: http://www.neatimage.com/profiling.html
Hope this helps.
Vlad
Hope this helps.
Vlad