Nikos Alexandris wrote:
(sorry for re-sorting the message, just to keep it easy to follow-up)
joel dinis:
> I trying to classify remote sensing imagery, and
> I thought to try the i.smap module, but
> when I run the i.gensigset,
Nikos Alexandris:
Please, could you copy-paste the exact command you used?
Does the "maxsig=" (e.g. maxsig=20) make any difference?
joel dinis:
In fact, I put maxsig=30.
i.gensigset trainingmap=amostras group=grupo subgroup=subgrupo
signaturefile=assinaturas maxsig=30
What about smaller maxsig's, like:
- maxsig=25
- maxsig=20
- maxsig=15
?
Nikos
Also it might help to know what is contained in the trainingmap. i.e:
r.info -r amostras
> 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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