i.class->i.cluster seed file

[O. Hellwich]

Hi GRASS users,

Does anybody know what the use of a seed file (e.g. from i.class)
in i.cluster is? As far as I understand i.cluster it does an 
unsupervised computation of a signature file. But apparently it
can be supported by a signature from a supervised classification.
Doing this I found that the number of classes i.cluster generates
is limited to the number of classes in this additional input signature
(seed) file. Now I don't really understand why i.cluster should be
used with such a given signature file. May be it "improves" the
signatures.

Does anybody know more about this matter? 
Thanks for your help.

Olaf
------------------------------------------------------------
Olaf Hellwich
Chair for Photogrammetry and Remote Sensing
Technical University of Munich
Arcisstr. 21
80290 Muenchen
Germany

Phone: +49 89 2105 2677
Fax: +49 89 280 9573
EMail: olaf at photo.verm.tu-muenchen.de
------------------------------------------------------------