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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Frank,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Yes, you are right. To get the intersection point you patch the line maps (v.patch), use v.clean on the patched maps and sve the intersection points (errors option in v.clean). Then
you add categories to the generated points with v.category…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">That just for correction of my earlier suggestion. Your approach with v.profile seems way more appropriate.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">If all your lines have the same cat value, you could create new, induvial cat values with v.category, before you run v.profile (I have not looked at your dataset yet…)?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Frank David <frank.david@geophom.fr>
<br>
<b>Sent:</b> onsdag 27. april 2022 19:23<br>
<b>To:</b> Stefan Blumentrath <Stefan.Blumentrath@nina.no>; GRASS user list <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] multiple<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="font-size:10.0pt">Hi Stephan,</span><o:p></o:p></p>
<p><span style="font-size:10.0pt">I'm not very used to v.overlay, but it seems to be used with area and not with lines crossing lines, isn't it ?</span><o:p></o:p></p>
<p><span style="font-size:10.0pt">Frank</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Le 27/04/2022 à 09:14, Stefan Blumentrath a écrit :<o:p></o:p></p>
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<pre>Hi Frank,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>My general approach would be like this:<o:p></o:p></pre>
<pre>v.overay to intersect transects and lines<o:p></o:p></pre>
<pre>v.to.points use=start to get transect start points<o:p></o:p></pre>
<pre>v.distance to get distance from transect start point to point where lines cross<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>With v.distance you need to try whether it is sufficient to compute distance to the nearest point only or if you need to compute distance to all intersection points within the distance equal to the length of the transect...<o:p></o:p></pre>
<pre>If the latter is the case you would need to filter out lines with distances that are not along a transect.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Hope that helps.<o:p></o:p></pre>
<pre>v.distance can produce lines, so you could check visually if the approach works as expected.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Just a suggestion.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Cheers<o:p></o:p></pre>
<pre>Stefan<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>-----Original Message-----<o:p></o:p></pre>
<pre>From: grass-user <a href="mailto:grass-user-bounces@lists.osgeo.org"><grass-user-bounces@lists.osgeo.org></a> On Behalf Of Frank David<o:p></o:p></pre>
<pre>Sent: tirsdag 26. april 2022 20:01<o:p></o:p></pre>
<pre>To: GRASS user list <a href="mailto:grass-user@lists.osgeo.org"><grass-user@lists.osgeo.org></a><o:p></o:p></pre>
<pre>Subject: [GRASS-user] multiple<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Hello,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>I need to identify vector lines (like roads, rivers) crossed by a transect and get distance from the beginning of the transect. For the moment I'm using v.profile but it returns only the first item. Is there any way to get all crossed lines ?<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Thank for your help,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Frank<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>grass-user mailing list<o:p></o:p></pre>
<pre><a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><o:p></o:p></pre>
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