[GRASS-user] removal of duplicate points

Nikos Alexandris nikos.alexandris at felis.uni-freiburg.de
Wed Mar 5 13:27:33 EST 2008


On Wed, 2008-03-05 at 09:58 -0800, Dylan Beaudette wrote:
> Hi,

Hi Dylan
> 
> I have some "squares" which are stored as polygons. When converting these to 
> points (v.to.points) I am left with the 5 points (first and last point are 
> duplicated) that define the corners of the "square".
> 
> Is there a vector module (v.edit / v.clean) that could remove duplicate 
> points? I would like to replace the manual operation with v.digit with 
> something that can be scripted. Note that there are multiple "squares", so a 
> simple v.out.ascii | head -4 | v.in.ascii  would be a little awkward. 
> 
> Ideas?

Not really a solution but maybe...

If polygons have first and last points duplicated what happens if they
are converted in polylines?

Duplicate coordinates still there?

If not it could be an easy method to convert boundaries to lines and
continue your task.



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