[GRASS5] export RGB channels in one ERDAS/IMG file

Radim Blazek blazek at itc.it
Thu Sep 2 10:47:02 EDT 2004

Isn't it possible to simply use GRASS groups, which are represented
as multiband in GDAL?


On Thursday 02 September 2004 15:39, Frank Warmerdam wrote:
> Markus Neteler wrote:
> > Frank,
> >
> > this could be added easily. But I don't know how to tell 'gdal_translate'
> > about it.
> > The docs only mention single-file input:
> > http://www.remotesensing.org/gdal/gdal_utilities.html#gdal_translate
> Markus,
> gdal_translate doesn't support multiple input files. Holy cow! r.out.gdal
> is just a script!  OK, that isn't news to you but it is to me.  I will add
> writing a C r.out.gdal to my TODO list.
> >>Given that it does not, it seems you might have to do this all rather
> >>indirectly.  One approach is to output individual rasters and then
> >> composite them with an external application like OpenEV or within
> >> Imagine itself.
> >
> > As I also need that functionality, I'll add it once I have understood
> > the gdal_translate procedure...
> In the meantime, I don't think it will be easy to do from within GRASS.
> BTW, before I forgot that gdal_merge.py can stack input files into seperate
> bands if given the -seperate switch.  So for anyone with a GDAL build that
> includes python support you could export the various bands to standalone
> files and then merge them into an RGB composite with:
>    gdal_merge.py -o out.img -of HFA -seperate band1.img band2.img band3.img
> Best regards,

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