[GRASS-dev] problem with GridModule

Markus Neteler neteler at osgeo.org
Mon Nov 16 05:28:04 PST 2015

On Tue, Nov 10, 2015 at 7:58 PM, Anna Petrášová <kratochanna at gmail.com> wrote:
> Hi,
> I am running viewsheds using the GridModule on 4 tiles. It runs, but the
> result has some artificial gaps, see the attached picture (black is the
> correct viewshed as vector and red and blue are wrong results). The problem
> must be in the patching of the 4 tiles, because the tiles alone are fine. I
> tried to run the same viewshed couple of times and it seems to behave
> randomly, sometimes I get correct result, sometimes I get a gap. Any idea
> what could be wrong?

Can you adjust the number of cores being used? To see if it influences it?

> Maybe some bug in the pygrass raster library?

Looks like a race condition?


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