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

[joel dinis]

Hello Micha,

I put r.info -r amostras
as sugested, get the following:
min=112
max=512

(This values are index to my classes.)

JD

On Tue, Apr 6, 2010 at 4:39 PM, Micha Silver <micha at arava.co.il> wrote:

> 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
>
>
>
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