[GRASS-user] Centerlines of Polygons (skeletons)
Aurora Geomatics
aurorageomatics at telus.net
Wed Jun 18 17:39:59 EDT 2008
This sounds very interesting, certainly I could see this really coming
in handy when given a few thousand polygons of rivers and streams and
asked to quickly output the centerlines... Finding centerlines of
river/stream polygons may seem so simple for all this powerful
computational equipment and software to clients, and perhaps it is to
those who have higher math skills...
On 18-Jun-08, at 2:22 PM, Wolf Bergenheim wrote:
>
> On 19.06.2008 00:01, Aurora Geomatics wrote:
>> I wonder, is there a way to create a Voronoi diagram in GRASS?
>
> There is the v.voronoi module, which is also the subject of one of
> the Summer of Code projects this summer. I've been looking at an
> algorithm that creates Voronoi diagrams out of skeleton lines, but
> currently there is no direct support for skeleton lines in GRASS, as
> far as I can tell, perhaps if Martin P. gets interested he will
> develop this method and as a by-product a v.skeleton module, but
> that won't probably happen autumn if at all.
>
> --Wolf
Looks like some interesting material, I'll have a read though this,
see what I can use out of it for my situation. I noticed the issue of
the "Branching" outside the Centerline/Skeleton came up, I'll have to
read deeper to see if or what the solution was for this issue.
> Have a look at this old page
>
> http://research.esd.ornl.gov/CRERP/DOCS/RIVERMI/P114.HTM
>
> you could do the same thing in GRASS
>
> Bill H.
Thanks Tom, I must have miss spelled when I searched it in the GRASS
manual.
> On Wed, Jun 18, 2008 at 02:01:56PM -0700, we recorded a bogon-
> computron collision of the <aurorageomatics at telus.net> flavor,
> containing:
>>
>> I wonder, is there a way to create a Voronoi diagram in GRASS?
>>
>
> Yes. With v.voronoi.
> --
> Tom Russo
Mars Sjoden
Aurora Geomatics
aurorageo at telus.net
http://arorageo.blogspot.com/
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