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

[Micha Silver]

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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-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il