[GRASS-user] New module for fuzzy calsification added to svn repository

Jarosław Jasiewicz jarekj at amu.edu.pl
Mon Mar 29 09:06:12 EDT 2010

I forgot: If there is someone who can help me adjust this analysis to 
analyze imagery data, please contact me. I know almost nothing on 
analysis of such data but it seems it could be useful for it.

Jarosław Jasiewicz pisze:
> Hi list!
> I added new module r.fuzzy.system to svn repository:
> this is standalone classification module, to work require only sets 
> and rules definition (see module description and small tutorial in 
> description.html)
> what module do (internally):
> - parse sets and rules text files before calculation
> - creates fuzzy sets based on user's definition
> - implicate fuzzy rules form antecedents to consequent based on user 
> rules
> - aggregate consequents
> - defuzzify final set
> additional features:
> - output fuzzy maps for particular rules
> - output consequents and aggregated fuzzy set for particular cells 
> (without map calculation)
> In spite that module has the same name as that created by Francois 
> Declaux, it is completely new tools without any references to that 
> except it was created for that same reasons. Module r.fuzzy system do 
> not require r.fuzzy and r.fuzzy.logic to work, but these modules can 
> be used to trace intermediate results (they use the same fuzzy 
> algorithms)
> It fact module do almost all what I assumed, but there are probably 
> lot of bugs and errors. Because it was rather difficult coding 
> (especially text file and expression parser) any help with testing 
> will be appreciated. I will also appreciate if someone with better 
> English than mine can help me write tutorial on fuzzy logic in GIS
> Known issues:
> If there are cells for which membership in all sets is 0 module 
> returns null. It is probably difficult to solve without extensive 
> graphical UI with additional correction and check-out tools so 
> probably will remain unsolved.
> regards
> Jarek Jasiewicz
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