[GRASS-user] clip and rotate a raster

[G. Allegri]

I don't have a raster that fits my region. I should create a vector with
v.in.region, rasterize it and use it as a MASK... well, I hoped there was
something more linear. The same could be used to clip on the base of a
polygon.

The unsolved problem is rotation (and shift): making affine tranformations
using just a x-shift and y-shift parameter, and a rotation angle having set
a point as origin (or just around the "center" of the raster).

2008/1/25, Nikos Alexandris <nikos.alexandris at felis.uni-freiburg.de>:
>
> Hi,
>
> if you already have a raster that fits your region then simply create a
> MASK and just create a new raster with r.mapcalc.
>
> r.mapcalc clipped_rast=rast
>
> (r.mapcalc works only on the MASK so you can quickly clip any raster
> like that).
>
>
> On Fri, 2008-01-25 at 00:15 +0100, G. Allegri wrote:
> > Surely a stupid question, but I can't find a way to clip a raster on
> > the base of the region settings and/or the base of a vector. I can
> > MASK, I can reclass, but I can't clip!
> > Furthermore, is it possible to rotate a raster without the use of a
> > 1st polynomial rectification through GCPs?
> >
> > Giovanni
> > _______________________________________________
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> > grass-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-user
> --
> Nikos Alexandris
> .
> Department of Remote Sensing & Landscape Information Systems
> Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University
> Freiburg
> .
> Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype:
> Nikos.Alexandris
> .
> Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
>
>
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