Classification Procedures

[John Helly]

Hi.
I'm a new GRASS user trying to find tutorial type information on the use of
the classification procedures for image processing.   I'm confused by the
need to have a minimum of two files in the group/subgroup and how to create
a signature file.  Any pointers to examples or documentation would be most
welcome.
cheers.
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John Helly, University of California, San Diego
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