[GRASS-user] raster boundings

[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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