[GRASS-user] Question on memory allocation and use

[Moritz Lennert]

On 23/09/16 20:51, Rich Shepard wrote:
> On Fri, 23 Sep 2016, Markus Metz wrote:
>
>> Apparently there are less than 52 MB of free memory left. The resulting
>> vector contours must be quite large. Try to export GRASS_VECTOR_LOWMEM=1
>> before running r.contour.
>>
>> Maybe also use a larger step or less levels.
>
>   Took a different approach by reducing the size of the source DEMs (which
> cover a very large area compared to the area of interest).
>
>   Using v.to.rast I converted the project boundary vector to a raster file,
> then made it into a mask with r.mask. The mask then limited the area of the
> source DEMs with g.copy.

FYI: Since GRASS 7 r.mask actually has a vector= parameter which allows 
setting the mask directly from a vector map.

>
>   Now re-running r.contour on the bare earth DEM; it should easily fit into
> the 4G RAM on this host.
>
> Thanks, Markus,
>
> Rich
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