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

GRASS GRASS user
1

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?
Thanks in advance.

Best regards

Cheng

2

On Mon, Sep 26, 2016 at 9:11 AM, Qiao Cheng <qiaoch@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

3

Dear Markus,

Thanks for your suggestion! I will take a try.

Best regards

Cheng


At 2016-09-26 16:43:57, "Markus Neteler" <[neteler@osgeo.org](mailto:neteler@osgeo.org)> wrote:
>On Mon, Sep 26, 2016 at 9:11 AM, Qiao Cheng <[qiaoch@yeah.net](mailto:qiaoch@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