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Moin Markus<br>
<br>
thanks for your helpful answer. v.split is what I was looking for
and couldn't find.<br>
<br>
I did see the v.generalize tutorial in the wiki. That's where I
found the great description of in- and circumscribing smoothing ;-)
But I did not find any information on the parameter of snakes,
neither on the manual page nor the tutorial. alpha and beta seem to
influence somehow the smoothness. But I could not figure out what
the paramter threshold does. Seems to have no effect.<br>
<br>
Thanks<br>
Robert <br>
<br>
<br>
<div class="moz-cite-prefix">Am 19.06.19 um 18:01 schrieb Markus
Metz:<br>
</div>
<blockquote type="cite"
cite="mid:CAG+h=FHuWjS5U=GDMSj7dTsPutaLKet6E=Qi+xf7PTux71NsCg@mail.gmail.com">
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<div dir="ltr">Hi Robert,<br>
<br>
On Wed, Jun 19, 2019 at 4:26 PM Robert Nuske <<a
href="mailto:rsn.mailinglists@gmail.com"
moz-do-not-send="true">rsn.mailinglists@gmail.com</a>>
wrote:<br>
><br>
> Dear Listers,<br>
><br>
> I would like to smooth polygons coming from a raster via
r.to.vect using<br>
> v.generalize methods=snakes.<br>
><br>
> If I understood the documentation correctly, snakes is the
only method<br>
> that tries to go the middle ground: neither entirely
circumscribing<br>
> (larger than original polygon) nor inscribing (smaller than
original<br>
> polygon) the polygon. I love that behavior. But snakes only
works with<br>
> the available vertices and does not generate new vertices
=> quite rough<br>
> outlines.<br>
><br>
> So i thought it would be a good idea to densify the
vertices of the<br>
> polygon before the generalization. Create new vertices with
distance x<br>
> on the boundary of the polygon. But couldn't find a
function in GRASS<br>
> doing that.<br>
<div><br>
</div>
<div>v.split -n should do exactly this: add new vertices with
distance x: length=x</div>
<div>The -n flag causes new vertices to be added with splitting
the lines/boundaries.</div>
<div><br>
</div>
<div>></div>
> I would love any hints on generalization in general and on
how to<br>
> densify my vertices.<br>
<div><br>
</div>
<div>Apart from the manual of v.generalize, there is a tutorial
at</div>
<div><a
href="https://grasswiki.osgeo.org/wiki/V.generalize_tutorial"
moz-do-not-send="true">https://grasswiki.osgeo.org/wiki/V.generalize_tutorial</a></div>
<div>(maybe not completely up to date)<br>
</div>
<div><br>
</div>
<div>HTH,</div>
<div><br>
</div>
<div>Markus M</div>
<br>
</div>
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