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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">If someone could help me with this, I would be grateful.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve converted a polygon layer to a line layer. Sometimes the lines segments are a duplicate of another line segment (from an adjacent polygon).
<br>
I would like to delete the duplicate lines and only store the one of all duplicate line segments. It doesn’t matter which one I store.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve tried to store the line layer as a topology and erase the edges that are the same, but I don’t have enough knowledge of topologies. To be honest not much knowledge at all.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve tried this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">DELETE FROM topo1.edge_data WHERE edge_id NOT IN (SELECT MAX(edge_id) FROM topo1.edge_data GROUP BY geom)
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But I will not find any to delete, could it be that the geometry of the line segments goes in the opposite direction of each other?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But I don’t know if this approach is going to work anyway.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If someone could tell me how to delete “common” line segments I would be very happy.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Paul <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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