<div dir="auto"><div>Hi Karsten,<br><br>With v.type you can then change the type "line" to "boundary" and eventually place centroid(s) with v.centroid to complete closed boundaries plus centroid to topologically correct areas.</div><div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto">Markus</div><div dir="auto"><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">karsten <<a href="mailto:karsten@terragis.net">karsten@terragis.net</a>> schrieb am Fr., 6. März 2020, 18:28:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial">Hi Markus,</font></span></div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial">I will look into this Grass function and how I can use
it. I am not sure however if it can output polygons rather than lines
</font></span></div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial">Cheers</font></span></div>
<div dir="ltr" align="left"><span><font color="#000080" size="2" face="Arial">Karsten</font> </span></div><br>
<div lang="en-us" dir="ltr" align="left">
<hr>
<font size="2" face="Tahoma"><b>From:</b> Markus Neteler [mailto:<a href="mailto:neteler@osgeo.org" target="_blank" rel="noreferrer">neteler@osgeo.org</a>]
<br><b>Sent:</b> Friday, March 06, 2020 14:55<br><b>To:</b>
karsten<br><b>Cc:</b> OSGeo-discuss<br><b>Subject:</b> Re: [OSGeo-Discuss]
geospatial algorithm to create area midway boundaries from lines
?<br></font><br></div>
<div></div>
<div>Hi Karsten,
<div><br></div>
<div>Probably this GRASS GIS Addon can help:</div>
<div><br></div>
<div><a href="https://grass.osgeo.org/grass7/manuals/addons/v.centerline.html" target="_blank" rel="noreferrer">https://grass.osgeo.org/grass7/manuals/addons/v.centerline.html</a><br></div>
<div><br></div>
<div>If I got your wish right...</div>
<div><br></div>
<div>Best,</div>
<div>Markus</div>
<div><br></div></div><br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">karsten <<a href="mailto:karsten@terragis.net" target="_blank" rel="noreferrer">karsten@terragis.net</a>> schrieb am Fr.,
6. März 2020, 17:36:<br></div>
<blockquote class="gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><u></u>
<div>
<div><font color="#000080" size="2" face="Arial"><span>Hi All,</span></font></div>
<div><font color="#000080" size="2" face="Arial"><span></span></font> </div>
<div><font color="#000080" size="2" face="Arial"><span>a general geospatial question
to all: </span></font></div>
<div><font color="#000080" size="2" face="Arial"><span>I am trying to find out if
there is any existing geospatial algorithm (in any open Open Source
Geospatial software) that would allow to use a network of lines as a start
point and expand those in such a way that I can create new area boundaries for
each of the lines "coverage area". What I mean with that is if one could
"buffer" the lines out in such a way to create boundaries where any potential
buffers would meet at the middle way point between the lines so that in the
end I could have an area within that is the starting line. On example could
look like this (5 hand drawn lines in red and corresponding colored areas
that I would want to create). Note that is exact but to communicate the idea)
see <a href="http://terra5.terragis.net/sites/html/aeras_for_lines%20copy.png" rel="noreferrer noreferrer" target="_blank">http://terra5.terragis.net/sites/html/aeras_for_lines%20copy.png</a></span></font></div>
<div><font color="#000080" size="2" face="Arial"><span></span></font> </div>
<div><font color="#000080" size="2" face="Arial"><span>It's kind of similar to
Thiessen polygons but for lines instead of points...</span></font></div>
<div><font color="#000080" size="2" face="Arial"><span></span></font> </div>
<div><font color="#000080" size="2" face="Arial"><span>One preference would be if
there was something that could be used programmatically on large data sets
...</span></font></div>
<div><font color="#000080" size="2" face="Arial"></font> </div>
<div><span><font color="#000080" size="2" face="Arial">Cheers</font></span></div>
<div><span><font color="#000080" size="2" face="Arial">Karsten</font></span></div>
<div><span><font color="#000080" size="2" face="Arial"></font></span> </div>
<div align="left">
<div><span style="FONT-SIZE:11pt;FONT-FAMILY:'Verdana','sans-serif'">Karsten
Vennemann<br></span><span style="FONT-SIZE:9pt;FONT-FAMILY:'Verdana','sans-serif'"><span style="COLOR:#003264"><a title="http://www.terragis.net/
blocked::http://www.terragis.net/" href="http://www.terragis.net" rel="noreferrer noreferrer" target="_blank"><font title="http://www.terragis.net/" color="#0000ff">www.terragis.net</font></a></span></span><u></u><u></u><u></u></div>
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