<div dir="ltr"><div dir="ltr"><span style="font-family:Verdana,sans-serif;font-size:13.3333px">> Would you happen to have a hint to how to delete such components from a network/topology?<br></span><br><br>my proposal:</div><div dir="ltr"> -create "<span style="font-family:monospace">components_table"</span></div><div dir="ltr"><font face="monospace">-insert new column ("component" id ) to the edge_table ( and fill from components_table )<br></font>- calculate sum(cost ) by component .. and find the long tails</div><div dir="ltr">- filter OR delete by small component id-s ( I prefer creating new edge table instead of delete .. )<br><br><font face="monospace"><br><font color="#0000ff">-- public.edge_table </font></font></div><div dir="ltr"><font face="monospace"><font color="#0000ff">-- <a href="https://docs.pgrouting.org/3.1/en/sampledata.html">https://docs.pgrouting.org/3.1/en/sampledata.html</a><br></font></font></div><div dir="ltr"><font face="monospace" color="#0000ff"><br></font></div><div dir="ltr"><font face="monospace" color="#0000ff">CREATE TABLE components_table as <br> SELECT * FROM pgr_connectedComponents(<br> 'SELECT id, source, target, cost, reverse_cost FROM edge_table'<br> )<br>;<br><br>-- add a new column to the edge_table<br>ALTER TABLE edge_table ADD COLUMN component BIGINT;<br>UPDATE edge_table as e <br> SET component = c.component<br> FROM components_table c <br> WHERE (e.component is NULL) AND e.source=c.node</font></div><div dir="ltr"><font face="monospace" color="#0000ff">; <br><br>-- calculate small component -> sum(cost)</font></div><div dir="ltr"><font color="#0000ff"><font face="monospace">CREATE TABLE small_components as <br> SELECT component, <br> sum(cost) as sum_cost <br> FROM edge_table<br> GROUP BY 1<br> HAVING sum(cost) < 2 ;<br><br>-- create new_edge_table<br>-- filtering: not in small components<br>CREATE TABLE new_edge_table as <br> SELECT * FROM edge_table<br> WHERE component not in ( SELECT component FROM small_components )<br> ORDER BY id<br> ;</font><br></font><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div>the small_components tables</div><div><br></div><div><font color="#45818e" face="monospace"> select * from small_components;<br> component | sum_cost <br>-----------+----------<br> 14 | 1<br> 16 | 1<br>(2 rows)</font><br></div><div><br></div><div><br></div><div>all components:</div><div><font face="monospace" color="#3d85c6"><br></font></div><div><font face="monospace" color="#3d85c6"> SELECT component,<br> sum(cost) as sum_cost<br> FROM edge_table<br> GROUP BY 1 <br> ORDER BY 2 DESC ;<br><br> component | sum_cost <br>-----------+----------<br> 1 | 12<br> 14 | 1<br> 16 | 1<br>(3 rows)</font><br><br></div><div>In your case .. probably the cost is "in meter length " <br></div><div><br></div><div><br></div><div>ps:</div><div>- if you are using osm2pgrouting - increase the "--chunk" value: <a href="https://github.com/pgRouting/osm2pgrouting/issues/296">https://github.com/pgRouting/osm2pgrouting/issues/296</a> </div><div>- Welcome to the community :-) </div><div><br></div>Regards,<br><div> Imre</div></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Hans Skov-Petersen <<a href="mailto:hsp@ign.ku.dk" target="_blank">hsp@ign.ku.dk</a>> ezt írta (időpont: 2021. jún. 27., V, 23:17):<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif">Hi Imre<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif">It seems like something I can make work to identify small subnets/components. Thanks.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif">Would you happen to have a hint to how to delete such components from a network/topology?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">Cheers<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">Hans<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif"> Pgrouting-users <<a href="mailto:pgrouting-users-bounces@lists.osgeo.org" target="_blank">pgrouting-users-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Imre Samu<br>
<b>Sent:</b> 27. juni 2021 22:59<br>
<b>To:</b> pgRouting users mailing list <<a href="mailto:pgrouting-users@lists.osgeo.org" target="_blank">pgrouting-users@lists.osgeo.org</a>><br>
<b>Cc:</b> pgRouting developers mailing list <<a href="mailto:pgrouting-dev@lists.osgeo.org" target="_blank">pgrouting-dev@lists.osgeo.org</a>><br>
<b>Subject:</b> Re: [pgrouting-users] Dangling sub-networks<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif">> Is there a way to identify (and potentially delete) such minor sub-nets?</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif">IMHO: this is similar for detecting "Component" ( </span><a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FComponent_(graph_theory)&data=04%7C01%7Chsp%40ign.ku.dk%7C0080224f167f4bfad97d08d939ae6292%7Ca3927f91cda14696af898c9f1ceffa91%7C0%7C0%7C637604243862347472%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=gJ98Sl5TkTmIEfcuR137NEFMXHzJ6UzgTF8yc4vZXJI%3D&reserved=0" target="_blank">https://en.wikipedia.org/wiki/Component_(graph_theory)</a>
)<u></u><u></u></p>
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<p class="MsoNormal">Have you checked the <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.pgrouting.org%2F3.1%2Fen%2Fcomponents-family.html&data=04%7C01%7Chsp%40ign.ku.dk%7C0080224f167f4bfad97d08d939ae6292%7Ca3927f91cda14696af898c9f1ceffa91%7C0%7C0%7C637604243862352447%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=18ks3lmIRl1BLgtS%2FmPSjZ%2B7S3Q8r0IdufOdD871rA4%3D&reserved=0" target="_blank">https://docs.pgrouting.org/3.1/en/components-family.html</a>
functions?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">If you know the components - you can calculate the aggregated length of edges for each component.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Regards,<u></u><u></u></p>
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<p class="MsoNormal"> Imre<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hans Skov-Petersen <<a href="mailto:hsp@ign.ku.dk" target="_blank">hsp@ign.ku.dk</a>> ezt írta (időpont: 2021. jún. 27., V, 21:42):<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif">Hi list</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif">I realize that the network (OSM) I am working on is not always connected as it should (big surprise
</span><span lang="EN-US" style="font-size:10pt;font-family:Wingdings">J</span><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif">)…. Some parts are disjoint from the rest – even when not being situated on islands, or other places
where a disjoint is expected. Accordingly, routes from nodes on such sub-nets cannot be generated.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif">Is there a way to identify (and potentially delete) such minor sub-nets? For instance by asking for
the aggregated length of edges of a sub-net.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10pt;font-family:Verdana,sans-serif"> </span><u></u><u></u></p>
<p class="MsoNormal"><img border="0" width="322" height="282" style="width: 3.3541in; height: 2.9375in;" id="gmail-m_-2783063299922393570gmail-m_-2125317114102677762gmail-m_1709301994394863974_x005f_x0000_i1033" src="cid:17a4f5d5c704ce8e91"><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"> </span><u></u><u></u></p>
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<b><span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">Hans Skov-Petersen</span></b><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">Professor of Geoinformatics</span><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"> </span><u></u><u></u></p>
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<b><span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">University of Copenhagen</span></b><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">Department of Geosciences and Natural Resource Management</span><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">Section of Landscape Architecture and Planning</span><u></u><u></u></p>
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<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">Rolighedsvej 23</span><u></u><u></u></p>
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<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">DK-1958 Frederiksberg</span><u></u><u></u></p>
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<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"> </span><u></u><u></u></p>
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<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"> </span><u></u><u></u></p>
<p class="MsoNormal" style="line-height:8pt">
<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">DIR +45 35 33 18 16</span><u></u><u></u></p>
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<span style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray">MOB +45 23 82 80 45</span><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"><a href="mailto:hsp@ign.ku.dk" title="hsp@ign.ku.dk" target="_blank"><span lang="EN-US" style="color:gray;text-decoration:none">hsp@ign.ku.dk</span></a></span><u></u><u></u></p>
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<span lang="EN-GB" style="font-size:7.5pt;font-family:Verdana,sans-serif;color:gray"><a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Finformationssikkerhed.ku.dk%2Fenglish%2Fprotection-of-information-privacy%2Fprivacy-policy%2F&data=04%7C01%7Chsp%40ign.ku.dk%7C0080224f167f4bfad97d08d939ae6292%7Ca3927f91cda14696af898c9f1ceffa91%7C0%7C0%7C637604243862382321%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=iC4BKXmSgmFCpq6n%2FdZHD5SzUZEUYF9nP2%2FrcD1LEdI%3D&reserved=0" target="_blank"><span style="color:gray;text-decoration:none">How
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