[GRASS-dev] v.clean threshold value unit for 'prune'

[Paulo van Breugel]

On 26-01-17 14:38, Markus Metz wrote:
>
>
> On Thu, Jan 26, 2017 at 11:15 AM, Paulo van Breugel 
> <p.vanbreugel at gmail.com <mailto:p.vanbreugel at gmail.com>> wrote:
> >
> >
> >
> > On 26-01-17 11:03, Markus Metz wrote:
> >
> >
> >
> > On Thu, Jan 26, 2017 at 10:51 AM, Paulo van Breugel 
> <p.vanbreugel at gmail.com <mailto:p.vanbreugel at gmail.com>> wrote:
> > >
> > > Hi
> > >
> > > I am using the v.clean tool with the option "prune". According to 
> the manual, threshold values have to be in map units. I am using this 
> with a latlon map with vertices as close as 0.0001 degrees. However, 
> v.clean only removes vertices at threshold values of about 50 or up. 
> This seems to suggest that the tools assumes threshold values are in 
> meters?
> >
> > The prune tool of v.clean never really worked. Please use 
> v.generalize instead.
> >
> >
> > OK, will do. Still the question remains whether this is a bug, an 
> error in the manual page (i.e., threshold values are not in mapping 
> units, but in meters like for the rmarea) , or I am doing something 
> wrong (note that it seems to work fine if one assumed threshold values 
> have to be in meters). If a bug or error in the manual page, I can 
> create a ticket.
>
> It's a bug in the code [0], the algorithm is not working properly. 
> There is v.generalize, therefore I recommend to remove the prune tool 
> from v.clean.
+1 if it doesn't work properly and it is a won't fix better to remove
>
> Markus M
>
> [0] 
> https://trac.osgeo.org/grass/browser/grass/trunk/lib/vector/diglib/prune.c
> >
> >
> >
> > Markus M
> >
> > >
> > > Best wishes,
> > >
> > > Paulo
> > >
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> >
> >
>
>
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