[GRASS-user] raster boundings

Maris Nartiss maris.gis at gmail.com
Tue May 6 10:28:20 EDT 2008

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,

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.
> ----------------------------------------------------------------
> This mail was sent through http://webmail.uni-jena.de
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user

More information about the grass-user mailing list