[GRASS-user] How can I rotate a raster map about a fixed axis

[Markus Neteler]

On Mon, Sep 26, 2016 at 9:11 AM, Qiao Cheng <qiaoch at yeah.net> wrote:
> Dear all,
>     I have a simple artificial raster map created by r.mapcalc command, I
> want rotating the raster map a finite angle about a fixed axis(for example,
> the y axis). But I didn't know how to achieve this. Could you give me some
> suggestions? Which command should I appeal to?

There is an addon:

i.rotate - Rotates the image around the centre of the computational window
https://grass.osgeo.org/grass70/manuals/addons/i.rotate.html

which you may want to try. Installation via graphical user interface
or by directly using g.extension.

Best,
Markus