<div dir="ltr"><div>Dear Daniel, <br></div><div><br></div><div>Thank you for your reply. Before I saw this, I had just come to the following solution involving a reversing logic when <b>node <> source</b></div><div><b><br></b></div><div><b> </b><br></div><div> select row_number() over (), st_makeline(<span style="color:rgb(0,0,255)">(case when node <> source then st_reverse(geom) else geom end)</span>) FROM pgr_dijkstra(<br> 'SELECT id, source, target, st_length(geom) as cost FROM public."WA_roads"',<br> (SELECT source FROM public."WA_roads"<br> ORDER BY ST_StartPoint(geom) <-><br> (select ST_SetSRID(ST_MakePoint(CAST(ocentx as double precision), CAST(ocenty as double precision)), 4326) from all_trips_non_zero where origin = 98001 LIMIT 1) ASC<br> LIMIT 1),<br> (SELECT source FROM public."WA_roads"<br> ORDER BY ST_StartPoint(geom) <-><br> (select ST_SetSRID(ST_MakePoint(CAST(dcentx as double precision), CAST(dcenty as double precision)), 4326) from all_trips_non_zero where destination = 98647 LIMIT 1) ASC<br> LIMIT 1), directed := false<br> ) as sp<br> JOIN public."WA_roads" rd ON sp.edge= <a href="http://rd.id">rd.id</a>;</div><div><br></div><div><br></div><div>But I will go with the official solution. I feel though that this should be the standard way of making the line from shortest path geometries since one never knows in advance if and when the reversing will be needed.<br></div><div><br></div><div>Thanks <br></div><div>Chintan Pathak <br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 17, 2019 at 12:42 AM Daniel Kastl <<a href="mailto:daniel@georepublic.de">daniel@georepublic.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Chintan,<div><br></div><div>For the problem of the "flipped" edges, which could be the cause of your problem, you can take a look at the workshop example:</div><div><a href="https://workshop.pgrouting.org/2.5/en/chapters/SQLfunction.html#geometry-handling" target="_blank">https://workshop.pgrouting.org/2.5/en/chapters/SQLfunction.html#geometry-handling</a><br></div><div>In the example you see that the reverse geometry is taken, if the edge is in the opposite direction. </div><div><br></div><div>I hope this helps,</div><div>Daniel</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 17, 2019 at 4:18 PM chintan pathak <<a href="mailto:chintan.pathak@gmail.com" target="_blank">chintan.pathak@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">
<div>Hi, <br></div><div><br></div><div>I am using pgr_dijkstra() to find the shortest path between origin and destination using a query like so: <br></div><div><br></div><div>
<pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">CREATE</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">OR</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> REPLACE </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">FUNCTION</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">public</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">sp_od</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
orig integer</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">,</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
dest integer</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
RETURNS </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">TABLE</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">shortest_path geometry</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
LANGUAGE </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-str">'sql'</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">AS</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">$</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">BODY</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">$</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">SELECT</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> st_makeline</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">geom</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> shortest_path
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">FROM</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> pgr_dijkstra</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-str">'SELECT id, source, target, st_length(geom, true) as cost FROM public."WA_roads"'</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">,</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">SELECT</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> source </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">FROM</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">public</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-str">"WA_roads"</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">ORDER</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">BY</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> ST_StartPoint</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">geom</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><-></span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">select</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> ST_SetSRID</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">ST_MakePoint</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">CAST</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">ocentx </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">double</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">precision</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> CAST</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">ocenty </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">double</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">precision</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">4326</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">from</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> all_trips_non_zero </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">where</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> origin </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">=</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> orig LIMIT </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">1</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">ASC</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
LIMIT </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">1</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">SELECT</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> source </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">FROM</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">public</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-str">"WA_roads"</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">ORDER</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">BY</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> ST_StartPoint</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">geom</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><-></span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">select</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> ST_SetSRID</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">ST_MakePoint</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">CAST</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">dcentx </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">double</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">precision</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> CAST</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">(</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">dcenty </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">double</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">precision</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">4326</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">from</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> all_trips_non_zero </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">where</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> destination </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">=</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> dest LIMIT </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">1</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">ASC</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
LIMIT </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lit">1</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">),</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> directed </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">:=</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> false
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">)</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">as</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> pt
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">JOIN</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">public</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-str">"WA_roads"</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> rd </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-kwd">ON</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> pt</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">edge </span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">=</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln"> rd</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">.</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">id</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">;</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">
</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">$</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pln">BODY</span><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun">$;<br><br></span></code></pre><pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><font face="arial,sans-serif">However, the returned result is wacky, as in the geometries are not stitched in order. I tried using ST_Union instead of ST_Makeline to make the line, which results in the correct geometry. However, the returned geometry is a multilinestring which is not amenable to the rest of my analysis. <br></font></span></code></pre><pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><font face="arial,sans-serif">The question and my attempts are detailed here: <a href="https://gis.stackexchange.com/questions/334302/pgr-dijkstra-gives-wacky-routes-sometimes-with-undirected-graph" target="_blank">https://gis.stackexchange.com/questions/334302/pgr-dijkstra-gives-wacky-routes-sometimes-with-undirected-graph</a>?<br></font></span></code></pre><pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><font face="arial,sans-serif">and <a href="https://gis.stackexchange.com/questions/335892/combining-the-output-of-st-collect-st-union-to-create-linestring-from-multilines" target="_blank">https://gis.stackexchange.com/questions/335892/combining-the-output-of-st-collect-st-union-to-create-linestring-from-multilines</a>? <br></font></span></code></pre><pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><font face="arial,sans-serif">The only "solution" to the problem seems to be reversing the edges that are not in the correct direction, as described here: <a href="https://lists.osgeo.org/pipermail/pgrouting-users/2010-April/000288.html" target="_blank">https://lists.osgeo.org/pipermail/pgrouting-users/2010-April/000288.html</a> but this doesnt seem trivial. <br> <br>Any help in this regards is appreciated. <br><br></font></span></code></pre><pre class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-lang-sql gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprint gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-prettyprinted"><code><span class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail-m_-8662785027418076932gmail-pun"><font face="arial,sans-serif">Thanks </font></span></code><br clear="all"></pre></div>-- <br><div dir="ltr" class="gmail-m_8284298155259303342gmail-m_-4163421912466759401gmail_signature"><div dir="ltr"><div><table style="margin:0px;padding:0px;border:0px none;outline:currentcolor none 0px;font-size:16px;font-family:proxima-nova-1,proxima-nova-2,Tahoma,Helvetica,Verdana,sans-serif;vertical-align:baseline;border-spacing:0px;color:rgb(51,51,51);line-height:22.4px;text-align:center" cellspacing="0" cellpadding="0" border="0"><tbody style="margin:0px;padding:0px;border:0px none;outline:currentcolor none 0px;font-weight:inherit;font-style:inherit;font-family:inherit;vertical-align:baseline"><tr style="margin:0px;padding:0px;border:0px none;outline:currentcolor none 0px;font-weight:inherit;font-style:inherit;font-family:inherit;vertical-align:baseline"><td style="padding:0px;border:0px 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width: 0px; height: 0px; overflow: hidden;" width="0" height="0">about.me/chintanpathak</div></td></tr></tbody></table></a></div></td></tr><tr style="margin:0px;padding:0px;border:0px none;outline:currentcolor none 0px;font-weight:inherit;font-style:inherit;font-family:inherit;vertical-align:baseline"><td style="padding:0px;border:0px none;outline:currentcolor none 0px;font-style:inherit;font-size:0px;font-family:inherit;vertical-align:baseline;text-align:left;width:auto;height:20px"><img src="https://about.me/t/sig?u=chintanpathak" style="margin: 0px; padding: 0px; border: 0px none; outline: currentcolor none 0px; font-weight: inherit; font-style: inherit; font-family: inherit; vertical-align: baseline; overflow: hidden;" width="1" height="1"></td></tr></tbody></table></div></div></div></div>
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