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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There are 2 solutions which can solve your
problem.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I still use my table name, roads, <span
class=SpellE>roads_edges</span>, and roads_</span></font> <font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>vertices.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>1. Go to roads_ vertices table, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><span
style='mso-spacerun:yes'> </span><span class=GramE>select</span>
id from <span class=SpellE>roads_vertices</span> where <span
style='mso-spacerun:yes'> </span><span class=SpellE>geom_id</span>=</span></font><b><span
style='font-weight:bold'>4769 or </span></b><span class=SpellE><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>geom_id</span></font></span><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>=</span></font><b><span
style='font-weight:bold'> 4770;</span></b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><span
style='mso-spacerun:yes'> </span>It will return your two
rows. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><span
style='mso-spacerun:yes'> </span>Use returned two ids to replace
4769 and 4770 in your command.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>2. Instead of using <span class=SpellE>shortest_path</span>
function, use <span class=SpellE>shortest_path</span></span></font> <font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>_<span class=SpellE>as_geometry</span>. This function takes node id
from Table roads. So 4769 and 4770 will works. Of cause, you need to make
change to satisfy <span class=SpellE>shortest_path</span></span></font> <font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>_<span class=SpellE>as_geometry</span> signature. And the return is
different. As function name indicates, it will return line geometry with edge
ID.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Fay<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
cartoweb-users-bounces@lists.maptools.org
[mailto:cartoweb-users-bounces@lists.maptools.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Fay Du<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><st1:date
Month="1" Day="11" Year="2006"><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma'>Wednesday, January 11, 2006</span></font></st1:date><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><st1:time
Hour="16" Minute="36"><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>4:36 PM</span></font></st1:time><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> 'Eggenschwiler Raphael'<br>
<b><span style='font-weight:bold'>Cc:</span></b>
cartoweb-users@lists.maptools.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Cartoweb-users]
dijkstra - miss up node ID</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>I believe there is ID
miss up.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>If you run sample data
step by step, there are 3 tables roads, roads_edges, and roads_</span></font> <font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>vertices.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>In table roads, souce_id
and target_id are different with roads_edges. But the two ids (same node, but
it has two different ID in table roads and roads_edges) are connected by table
roads_</span></font> <font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>vertices. In roads_</span></font> <font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>vertices, id is the source/target used in roads-edges, and gid is
the id of same node used in tables roads.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Shortest_path asks for id
from roads_edges. What you passed are node ID from Table roads. It is why
program cannot find the path.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Fay<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
cartoweb-users-bounces@lists.maptools.org
[mailto:cartoweb-users-bounces@lists.maptools.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Eggenschwiler Raphael<br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><st1:date
Month="1" Day="10" Year="2006"><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma'>Tuesday, January 10, 2006</span></font></st1:date><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> </span></font><st1:time
Hour="9" Minute="10"><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>9:10 AM</span></font></st1:time><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b>
cartoweb-users@lists.maptools.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Cartoweb-users] dijkstra</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Hi everyone !<br>
<br>
I try to use this pgdijkstra on my data with :<br>
<br>
<b><span style='font-weight:bold'>SELECT arc_num_nod_src as
"source",arc_num as "id",arc_num_nod_des as
"target",arc_cost as "cost" FROM TAB_ARC; </span></b><br>
<br>
source id target cost<br>
0 6259 4769
0<br>
4769 6260 4770 0<br>
4770 6261 4771 0<br>
4771 6262 4772 0<br>
4772 6263 4773 0<br>
0 6264
4775 0 <br>
4775 6265 4776 0<br>
4776 6266 4777 0<br>
4777 6267 4778 0<br>
4778 6268 4779 0<br>
4779 6269 4780 0<br>
4780 6270 4781 0<br>
0 6271
4783 0<br>
4783 6272 4784 0 <br>
4784 6273 4785 0<br>
4785 6274 4786 0<br>
4786 6275 4787 0<br>
4787 6276 4788 0<br>
4788 6277 4789 0<br>
4789 6278 4790 0<br>
0 6279
4792 0<br>
4792 6280 4793 0 <br>
<br>
But when I try this one :<br>
<br>
<b><span style='font-weight:bold'>select * from shortest_path('SELECT
arc_num_nod_src as "source",arc_num as "id",arc_num_nod_des
as "target",arc_cost as "cost" FROM
TAB_ARC',4769,4770,false,false); </span></b><br>
<br>
I become this message :<br>
<br>
ERROR: Error computing path: Source vertex not found<br>
<br>
Can someone help me ??<o:p></o:p></span></font></p>
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