[GRASS-user] Error with sub-group while using i.gensigset

[Luisa Peña]

I have re-downloaded NC_spm_08 from GRASS website and the already available
group,  lsat7_2000 at landsat doesn't display sub-group in i.cluster or other
functions..
Nevertheless, I tried what Markus said:
i.group group=t02 subgroup=sub input=lsat5_1987_10,lsat5_1987_20 (altough
this is not performed by GUI but by me on the command output)
Adding raster map <lsat5_1987_10 at landsat> to group
Adding raster map <lsat5_1987_20 at landsat> to group
Adding raster map <lsat5_1987_10 at landsat> to subgroup
Adding raster map <lsat5_1987_20 at landsat> to subgroup
i.group complete.

And then at i.cluster when I select t02, in subgroup there is no sub-group
only "NOT SELECTABLE ELEMENT".

What am I missing/or might be wrong?
Luisa

2010/4/14 Markus Neteler <neteler at osgeo.org>

> On Wed, Apr 14, 2010 at 7:41 PM, Luisa Peña <luisapena1979 at gmail.com>
> wrote:
> > Greetings
> > I'm freely following this tutorial
> > (http://grass.osgeo.org/wiki/Image_classification) and I'm getting a odd
> > error.
> > I'm sending this command:
> > i.gensigset trainingmap=a at landsat group=gr06 at landsat subgroup=sub
> > signaturefile=sig maxsig=5
>
> Do you really need all @landsat indications?
>
> > and I get this:
> > Finding training classes...
> > 5 classes found
> > Reading raster maps...
> > Clustering class 1 (1753 pixels)...
> > Number of subclasses is 5
> > Clustering class 2 (2810 pixels)...
> > Number of subclasses is 5
> > Clustering class 3 (2772 pixels)...
> > Number of subclasses is 5
> > Clustering class 4 (2177 pixels)...
> > Number of subclasses is 5
> > Clustering class 5 (6060 pixels)...
> > Number of subclasses is 5
> > unable to create signature file sig for subgroup sub of group
> gr06 at landsat
> > ERROR: Unable to create signature file <sig>
> >
> > I think it might have somethibg to do with i.group because everytime I
> open
> > i.group the followiong is printed to the Command output:
> > Invalid element 'gr03 at landsat@landsat'
> > Invalid element 'gr04 at landsat@landsat'
> > Invalid element 'gr05 at landsat@landsat'
> > Invalid element 'gr06 at landsat@landsat'
> > All these are groups that I have made
> >
> > If I do  group -l
> > group=gr06 at landsat                                                   I
> get:
> >
> > group <gr06> references the following raster maps
> > -------------
> > <lsat7_2000_10 at landsat>    <lsat7_2000_20 at landsat>
> > <lsat7_2000_30 at landsat>    <lsat7_2000_40 at landsat>
> > <lsat7_2000_50 at landsat>
> > -------------
> > i.group complete.
> >
> > What might be wrong?
>
> I dunno but perhaps the @landsat isn't properly stripped off in some cases.
> Could you retry to make the group etc in the landsat mapset itself in
> order to understand if @landsat makes the difference?
>
> Markus
>
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