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<p class="MsoNormal"><span lang="EN-US">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m new to postgis and db-handling overall. I’m having a problem with the example at:
</span><a href="http://blog.mathieu-leplatre.info/use-postgis-topologies-to-clean-up-road-networks.html"><span lang="EN-US">http://blog.mathieu-leplatre.info/use-postgis-topologies-to-clean-up-road-networks.html</span></a><span lang="EN-US"><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">This is what I want to do;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Merge 2 line layers together, and keep track on from which layer the lines came from (fname).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Create topology to fix the intersections and edges and save the result to a new table (roads_clean).<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">My SQL:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">CREATE TABLE merged AS( <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SELECT fname, the_geom FROM public."RST_1813_UTM31N_WE_D_R_Line"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">UNION <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SELECT fname, the_geom FROM public."CTR_1813_UTM31N_WE_line");<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">SELECT Populate_Geometry_Columns('merged'::regclass);<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">SELECT topology.CreateTopology('roads_topo', 32631);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SELECT topology.AddTopoGeometryColumn('roads_topo', 'public', 'merged', 'topo_geom', 'LINESTRING');<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">UPDATE merged SET topo_geom = topology.toTopoGeom(wkb_geometry, 'roads_topo', 1, 1.0);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">CREATE TABLE public."roads_clean" AS (<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> SELECT topo_geom::geometry FROM merged);<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>
<p class="MsoNormal"><span lang="EN-US">Nor I or pgAdmin 4 knows what wkb_geometry is, in the UPDATE command (directly copied from the example).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can someone please, help me?<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"><o:p> </o:p></p>
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