[GRASS-user] Re: Signature made by i.class not accessible?

[Markus Neteler]

On Thu, Mar 6, 2008 at 12:10 PM,  <Paula.Sankelo at fimr.fi> wrote:
> The commands I'm using are just:
>
> i.class map=varikuva group=testi subgroup=alatesti outsig=signature
>
> -Then there's the whole choosing and analyzing the test regions in the
> graphic window. When that's finished, I say:
>
>  i.maxlik group=testi subgroup=alatesti sigfile=signature class=resultmap
>
> And I get the error message:
>
> ERROR: Can't read signature file [signature].
>
> Still, the signature file IS created, and I can see it sitting and lurking
> there. I just can't use it.

I have tried to replicate your problem and see that i.group is now
broken:

# NC dataset
i.group mylsat7_2000 sub=mylsat7_2000
in=lsat7_2000_10,lsat7_2000_20,lsat7_2000_30,lsat7_2000_40,lsat7_2000_50,lsat7_2000_61,lsat7_2000_70,lsat7_2000_80
Adding raster map <lsat7_2000_10 at landsat> to group
Adding raster map <lsat7_2000_20 at landsat> to group
Adding raster map <lsat7_2000_30 at landsat> to group
Adding raster map <lsat7_2000_40 at landsat> to group
Adding raster map <lsat7_2000_50 at landsat> to group
Adding raster map <lsat7_2000_61 at landsat> to group
Adding raster map <lsat7_2000_70 at landsat> to group
Adding raster map <lsat7_2000_80 at landsat> to group
Adding raster map <lsat7_2000_10 at landsat> to subgroup
Adding raster map <lsat7_2000_20 at landsat> to subgroup
Adding raster map <lsat7_2000_30 at landsat> to subgroup
Adding raster map <lsat7_2000_40 at landsat> to subgroup
Adding raster map <lsat7_2000_50 at landsat> to subgroup
Adding raster map <lsat7_2000_61 at landsat> to subgroup
Adding raster map <lsat7_2000_70 at landsat> to subgroup
Adding raster map <lsat7_2000_80 at landsat> to subgroup
WARNING: Unable to create file [REF] for subgroup [mylsat7_2000] of group
         [mylsat7_2000 in landsat]
i.group complete.

It only generates
GRASS 6.4.svn (nc_spm_07):~/grassdata/nc_spm_07/landsat > tree
group/mylsat7_2000/
group/mylsat7_2000/
`-- REF

0 directories, 1 file

which is not sufficient. I suspect that this change broke i.group:

lib/imagery/fopen.c
2008-04-12 03:04  glynn
        * : Fix handling of group elements to cope with @mapset

http://trac.osgeo.org/grass/changeset/30948

Apparently the subdirectory is no longer generated. Possibly your problem
is unrelated, but I don't even arrive there...

Markus