NO NO NO! I have 30 CORINE land cover classes to classify. The number 512, for example, means 5.1.2, is a nominal number, IS NOT an classe id.
But may be right: may be the way the classes are represented in the system cause that problem. I'll test that.. Thanks JD On Tue, Apr 6, 2010 at 6:44 PM, Micha Silver <[email protected]> wrote: > joel dinis wrote: > > Hello Micha, >> >> I put r.info <http://r.info/> -r amostras >> >> as sugested, get the following: >> min=112 >> max=512 >> >> So, if I understand correctly, you are trying to classify into 400 > separate classes?! > I'm a beginner with image classification, and others with more experience > will know better, but I'll bet that's your problem. There must be many > separate training areas (with different cat values) with a very similar > spectral signature, and the algorithm is not able to differentiate between > them. > > (This values are index to my classes.) >> >> JD >> >> On Tue, Apr 6, 2010 at 4:39 PM, Micha Silver <[email protected] <mailto: >> [email protected]>> 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 <http://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. >> >> >> >> >> _______________________________________________ >> grass-user mailing list >> [email protected] <mailto:[email protected]> >> >> http://lists.osgeo.org/mailman/listinfo/grass-user >> >> This mail was received via Mail-SeCure System. >> >> >> >> >> >> -- Micha Silver >> Arava Development Co. +972-52-3665918 >> http://www.surfaces.co.il >> >> >> >> >> This mail was received via Mail-SeCure System. >> > > > -- > Micha Silver > Arava Development Co. +972-52-3665918 > http://www.surfaces.co.il > > >
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