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<div class="moz-cite-prefix">Ahem, sent before I was done:<br>
<br>
<div>WITH DD AS (<br>
SELECT seq, id1 AS node, cost<br>
FROM pgr_drivingDistance(<br>
'SELECT id, source, target, cost FROM
edge_table',<br>
7, 1.5, false, false<br>
)<br>
),<br>
dd_points AS(<br>
SELECT id, x, y<br>
FROM vertex_table w, DD d<br>
WHERE <a href="http://w.id">w.id</a> = d.node<br>
)<br>
SELECT pgr_alphaShape('SELECT * FROM dd_points');<br>
<br>
<br>
</div>
doesn't work...<br>
<br>
ERROR: relation "dd_points" does not exist<br>
<br>
<br>
I understand why this doesn't work, but I'm not sure how to work
around.<br>
<br>
<br>
On 06/21/2013 04:39 PM, Stephen Mather wrote:<br>
</div>
<blockquote cite="mid:51C4B9E4.7050903@smathermather.com"
type="cite">
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<div class="moz-cite-prefix">Ok so it get's interesting trying to
use embed one function within another, for example calculating
driving distance and wrapping with alpha shape.<br>
<br>
This is as far as I've gotten:<br>
<br>
<br>
<br>
<br>
On 06/21/2013 04:07 PM, Stephen Mather wrote:<br>
</div>
<blockquote cite="mid:51C4B291.3000705@smathermather.com"
type="cite">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
Hi All,<br>
<br>
Having a great time with 2.0-develop. Question on
pgr_drivingDistance. I added geometry to the test dataset and
wrote the following query to return all points within driving
distance:<br>
<br>
<div class="moz-text-html" lang="x-western">
<div dir="ltr">WITH DD AS (<br>
SELECT seq, id1 AS node, cost<br>
FROM pgr_drivingDistance(<br>
'SELECT id, source, target, cost FROM
edge_table',<br>
7, 1.5, false, false<br>
)<br>
)<br>
<br>
SELECT ST_AsText(the_geom)<br>
FROM vertex_table w, DD d<br>
WHERE <a moz-do-not-send="true" href="http://w.id">w.id</a>
= d.node<br>
;<br>
<br>
</div>
</div>
A) Am I correct in my usage of this?<br>
B) Am I correct in assuming there is no way (at this time) to
return subsets of lines, similar to TSP?<br>
<br>
Best,<br>
Steve<br>
<br>
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</blockquote>
<br>
</blockquote>
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