[GRASS-user] [GRASSLIST:1183] how to rotate raster in GRASS ? ArcGIS better than GRASS ?? I hope NO!!

[Hamish]

Maciej Sieczka wrote:
> Pierluigi De Rosa wrote:
> > Yes, unfortunately I have to rotate a DEM for a specifica angle so
> > do a  transposition is not a good method.
> > I kwon ArcGIS can rotate DEM but I hope this thinks is possible also
> > in  GRASS...
> 
> I haven't thought much of this, but how about r.to.vect feature=point
> -> v.transform zrot=angle?

Add v.surf.rst to transform back to a raster grid and I think you have a
very good method there. Careful with g.region settings. To make a MASK, 
maybe use either: v.mkgrid; define a box with corner coords into
r.in.poly or v.in.ascii format=standard + v.to.rast; or v.buffer
dist=1.5*cellsize.


Hamish