[GRASS-user] Memory issues

[Rich Shepard]

On Mon, 16 Jul 2018, Micha Silver wrote:

>>   Current region rows: 47371, cols: 83934
> 
> That means that each raster will have about 4 billion cells. A raster with
> integer values takes 32 bits per pixel, (double precision about the same,
> float about 1/2 of that), so if the whole raster needs to be kept in
> memory, you would require some 16GB of RAM....
   
Micha,

   So when creating vector contours grass7 needs to keep all raster cells in
memory while it's processing.

   This suggests that the solution is to create a mask and generate the
contours only within that area.

Thanks,

Rich