[GRASS-user] clip and rotate a raster

[G. Allegri]

Hi Hamish, thanks for the hints. I've already tried using r.region, but it
seemed to me it just managed boundaries. How could it be used to shift xy?


2008/1/25, Hamish <hamish_b at yahoo.com>:
>
> G. Allegri wrote:
> > I don't have a raster that fits my region.
>
> this will do it:
> r.mapcalc 'regionrast = 1'
>
>
> > 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).
>
> some ideas.
>
> simple translation without rotation: r.region
>
> 90 deg rotation / flipping:
> r.out.mat -> Matlab or GNU Octave.
> ML>> array_rot = orig_array' ;
> % flip array left-right or up-down
> ML>> array_flip = fliplr( flipud( orig_array ) ) ;
> r.in.mat
>
> for rotation by angle you could do more complicated stuff in Matlab.
>
>
> In GRASS i.rectify may be an option.
>
>
> Hamish
>
>
>
>
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