[QGIS-Developer] Issues running Grass r.plane

[Sylvain POULAIN]

Hi Luke,

Setting a region in Grass is really important.
In Grass tools :
- there is a panel tab where you can adjust region named "Region",
- you can also use g.region.multiple.raster from module tab,
- a shell is present in module tab to use grass commands.

In processing toolbox, setting region is embedded in tool.

Regards,

*Sylvain POULAIN*

Le sam. 30 janv. 2021 à 04:30, Catania, Luke A ERDC-RDE-GRL-VA CIV <
Luke.A.Catania at erdc.dren.mil> a écrit :

> Looking to use r.plane to create a slope of a constant plane.
>
> Tried to run the Grass tool using the example in the help below , but in
> QGIS I do not see a g.region method so how do I limit my area?
>
> # set computational region
> g.region raster=elev_lid792_1m -p
>
> # get center coordinates as an example
> g.region -c
> # get terrain height at point
> r.what map=elev_lid792_1m coordinates=638650.0,220375.0
> # shows elevation: 116.7734
>
> # generate tilted plane
> r.plane myplane30 dip=30 az=75 east=638650.0 north=220375.0 \
>         elev=116.7734 type=FCELL
>
> Whe running it with the example input.
>
> r.plane sloping_plane dip=30 az=75 east=638650.0 north=220375.0
> elev=116.7734 type=FCELL
>
> I just get a constant plane of the same height throughout, so not sure of
> that is an issue of not setting the region.
>
> Luke
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