[GRASS-user] Centerlines of Polygons (skeletons)

Aurora Geomatics aurorageomatics at telus.net
Wed Jun 18 17:01:56 EDT 2008

Thank you to both Christian and Michael,

I suppose that is an avenue to go down, but then I suppose if I were  
to go the Raster route I may as well use the DEM file and do a quick  

I wonder, is there a way to create a Voronoi diagram in GRASS?


Oh, is  there a method to convert a polygon into a set of equidistant  
points?  Either by distance or evenly spaced number of points?

I could then create thiessen polygons, clip to original polygon,  
convert thiessens to polylines, and select polylines that intersect  
polygon boundary... I suppose I would be left with somewhat of a  
centerline, although there would still be theissen polygon branches  
that extend towards the boundary and not run the centerline...  Gosh I  
need to go back to Geometry class to figure this out...

Any geometry wizards out there?

> Hi,
> I only know the way for raster data using r.thin to get a center line
> for e.g. wide raster streams.
> Christian.
> Am Mittwoch, den 18.06.2008, 10:24 -0700 schrieb Aurora Geomatics:
>> Wondering if there is a simple way in GRASS to produce skeletons of
>> Polygons (rivers/streams), to find the flow centerline.
>> thanks
>> Mars Sjoden
>> Aurora Geomatics
>> arorageo at telus.net
>> http://arorageo.blogspot.com/
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
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Mars Sjoden
Aurora Geomatics
aurorageo at telus.net

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