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

[joel dinis]

Hello Nikos,

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

JD

On Tue, Apr 6, 2010 at 4:04 PM, Nikos Alexandris <
nikos.alexandris at felis.uni-freiburg.de> wrote:

> joel dinis wrote:
> > I trying to classify remote sensing imagery, and
> > I thought to try the i.smap module, but
> > when I run the i.gensigset,
>
> Please, could you copy-paste the exact command you used?
> Does the "maxsig=" (e.g. maxsig=20) make any difference?
>
> 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.
>
>
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