[GRASS-user] A problem with i.gensigset.

[Nikos Alexandris]

joel dinis:
> > In fact, I put maxsig=30.
> > i.gensigset trainingmap=amostras group=grupo subgroup=subgrupo
> > signaturefile=assinaturas maxsig=30

NikosA:
> What about smaller maxsig's, like:
> 
> - maxsig=25
> - maxsig=20
> - maxsig=15

and even smaller than 10 perhaps since the algorithm indicates "9
remain" after the first removal.

Are the "sub-signature removals of the same amount for all classes"?

Nikos

> >         >  I always
> >         > get the same problem:
> >         > ...
> >         > Removed a singular subsignature number 1 (9 remain)
> >         > Removed a singular subsignature number 1 (8 remain)
> >         > Removed a singular subsignature number 1 (7 remain)
> >         > Removed a singular subsignature number 1 (6 remain)
> >         > Removed a singular subsignature number 1 (5 remain)
> >         > Removed a singular subsignature number 1 (4 remain)
> >         > Removed a singular subsignature number 1 (3 remain)
> >         > Removed a singular subsignature number 1 (2 remain)
> >         > Removed a singular subsignature number 1 (1 remain)
> >         > Unreliable clustering. Try a smaller initial number of
> >         clusters
> >         > Removed a singular subsignature number 1 (-1 remain)
> >         > Unreliable clustering. Try a smaller initial number of
> >         clusters
> >         > Number of subclasses is 0
> >         > Clustering class 12 (184 pixels)...
> >         > Removed a singular subsignature number 1 (9 remain)
> >         > Removed a singular subsignature number 1 (8 remain)
> >         > Removed a singular subsignature number 1 (7 remain)
> >         > Removed a singular subsignature number 1 (6 remain)
> >         > Removed a singular subsignature number 1 (5 remain)
> >         > Removed a singular subsignature number 1 (4 remain)
> >         > Removed a singular subsignature number 1 (3 remain)
> >         > Removed a singular subsignature number 1 (2 remain)
> >         > Removed a singular subsignature number 1 (1 remain)
> >         > Unreliable clustering. Try a smaller initial number of
> >         clusters
> >         > Removed a singular subsignature number 1 (-1 remain)
> >         > Unreliable clustering. Try a smaller initial number of
> >         clusters
> >         > Number of subclasses is 0
> >         > i.gensigset complete.
> >         >
> >         > And afterwards the signature file doesn't have any
> >         > spectral information. I really don't understand whats
> >         happening
> >         > and the cause to this outcome.
> >         >
> >         > Can anyone solve this "enigma"?
> >         >
> >         > Ps: I don't know if this information is important: I
> >         collected
> >         > about 450 samples distributed by 10 classes. I may also
> >         > add that the average number of pixels per sample is around
> >         50.
> >         >
> >         > And thanks list, for the previous tips: they were very
> >         useful.