[GRASS-dev] [Qgis-developer] GRASS regions

Markus Neteler neteler at osgeo.org
Fri Apr 27 02:33:44 EDT 2012

Hi Helmut,

please post this link to their list:



On Thu, Apr 26, 2012 at 10:26 PM, Helmut Kudrnovsky <hellik at web.de> wrote:
> http://lists.osgeo.org/pipermail/qgis-developer/2012-April/019781.html
>> To achieve this, we have to solve the problem of how to use grass regions,
>> a very useful concept for subsetting an analysis or changing its
>> resolution.
> As I'm having to do with topology in PostGIS I'm very interested in the
> concept behind GRASS regions. It's interesting that you mention a resolution
> as I've been thinking for a while that a default resolution could be
> computed
> given an extent in that the maximum error double precision floating points
> can
> represent depend on the biggest absolute value one may ever want to use.
> An extent (region) would then give you these upper limits so to be possibly
> usable to compute a resolution.
> Is this anything close to what GRASS is using these regions for ?
> Yeah, I know this is probably not the right list to discuss this, but
> I'm hoping grass people are also here and can help in harmonizing topologies
> some more, on a neutral gameboard :)
> --strk;
> -----
> best regards
> Helmut
> --
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