[GRASS-user] raster boundings

[Christian Schwartze]

Thanks - it works! So better reading the help pages... ;) But
unfortunately a little bit to slow when applying on large raster...

Best regards,
Christian.

Am Dienstag, den 06.05.2008, 17:28 +0300 schrieb Maris Nartiss:
> Just an idea:
> 1) Create new map with r.reclass where MyCat=1 OtherData=NULL and
> 2) then use g.region zoom=myreclassmap
> 
> Hope this helps,
> Maris.
> 
> 
> 2008/5/6, Christian Schwartze <Christian.Schwartze at uni-jena.de>:
> > Dear GRASS user,
> >
> > how can I obtain the boundings of raster subpart like the minimum rectangle
> > around  a certain category. I need it to specify the region for a
> > computationally intensive operation on a small part of the entire raster.
> > The
> > problem I have is the mapcalc step to operate with huge raster datasets
> > containing "novalue" data mainly together with only small categorized areas.
> > Defining a mask a
> > mask for the relevant value doesnt work - the mapcalc takes the same long(!)
> > time as without a mask. So specifying region is the next idea.
> >
> > Thanks a lot for some solution...
> >
> > Regards,
> > Christian.
> >
> >
> >
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