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<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">Did you try:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">v.net.allpairs input=river_network out=river_sampling_subnet where=”node_type=’sampling point’” # You could also use “cats=1-5” or whatever… and maybe also
specify arc_column=name arc_backward_column=name as I assume your network is directed, but arc_column options are probably not necessary..<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> grass-user [mailto:grass-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Stefan Blumentrath<br>
<b>Sent:</b> onsdag 27. september 2017 13.30<br>
<b>To:</b> Johannes Radinger <johannesradinger@gmail.com>; GRASS user list <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] Extract subnet from grass vector network based on selected nodes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Sorry, there is:
<a href="https://grass.osgeo.org/grass72/manuals/v.net.allpairs.html">https://grass.osgeo.org/grass72/manuals/v.net.allpairs.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> grass-user [<a href="mailto:grass-user-bounces@lists.osgeo.org">mailto:grass-user-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Johannes Radinger<br>
<b>Sent:</b> onsdag 27. september 2017 13.12<br>
<b>To:</b> GRASS user list <<a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a>><br>
<b>Subject:</b> [GRASS-user] Extract subnet from grass vector network based on selected nodes<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have a GRASS vector network that represents a river network (with many first order tributaries) and that has additional connected nodes that represent sampling sites. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'd like to extract a minimum subnetwork of the full network that still connects a set of selected nodes (e.g. identified by their cat). However, network edges (i.e. river segments) that are not necessary to connect the sampling points
should be excluded in the new subnetwork. Is there a function or process in GRASS GIS to extract such a subnetwork that fully connects a set of selected nodes?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">Johannes<o:p></o:p></p>
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