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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, ST_DWithin is a bounding box test, so it’s fast but not
accurate. You’ll want to do a second test with ST_Distance to get the actual
distance after gathering up everything that results in true for ST_DWithin.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Steve<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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alt="http://www.clemetparks.com/images/esig/cmp-ms-90x122.png" v:shapes="cmp-ms-90x122.png"><![endif]><span
style='font-size:14.0pt;font-family:"Arial","sans-serif";color:#006C56'>Stephen
Mather<br>
</span><span style='font-size:11.0pt;font-family:"Arial","sans-serif";
color:#006C56'>Geographic Information Systems (GIS) Manager<br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#006C56'>(216) 635-3243<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#006C56'>svm@clevelandmetroparks.com<br>
</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a href="http://www.clemetparks.com/"><span style='font-size:
9.0pt;font-family:"Arial","sans-serif";color:blue'>clevelandmetroparks.com</span></a><o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>
postgis-users-bounces@postgis.refractions.net
[mailto:postgis-users-bounces@postgis.refractions.net] <b>On Behalf Of </b>Pedro
Costa<br>
<b>Sent:</b> Thursday, May 17, 2012 11:54 AM<br>
<b>To:</b> PostGIS Users Discussion<br>
<b>Subject:</b> Re: [postgis-users] break lines at intersections<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>i found the error. the parallels are a less then 3 meters...<br>
<br>
thanks<br>
<br>
<br>
<br>
Em 17-05-2012 16:43, Pedro Costa escreveu: <o:p></o:p></p>
<p class=MsoNormal><span class=hps><span lang=EN>I'm already tried</span></span><span
lang=EN> <span class=hps>this function</span> <span class=hps>but with no</span>
good <span class=hps>results</span>, <span class=hps>I do not understand</span>
<span class=hps>why.</span><br>
<span class=hps>You can</span> <span class=hps>see an example</span> <span
class=hps>in the</span> <span class=hps>attached image</span>. <span class=hps>The
streets are</span> <span class=hps>red lines</span>. <span class=hps>The</span>
<span class=hps>parallel</span> <span class=hps>purple and</span> <span
class=hps>what I want to</span> <span class=hps>clear</span> <span class=hps>yellow.</span><br>
<br>
<span class=hps>Any idea</span> <span class=hps>?</span></span><br>
<br>
<br>
I tried the st_dwithin like this:<br>
<br>
<br>
create table street8 as (SELECT paralell.geom FROM parallel,street WHERE
st_dwithin(paralell.geom, streets.the_geom, 2.99 ))<br>
<br>
<br>
The 'line erros' that i want to delete are a less than 3 meters from streets...<br>
<br>
<br>
thanks<br>
<br>
<br>
<br>
Em 17-05-2012 16:32, Nicolas Ribot escreveu: <o:p></o:p></p>
<p class=MsoNormal>Yes, it should be: <o:p></o:p></p>
<div>
<p class=MsoNormal>st_dwithin will help you to find all lines from a table
within a certain distance to other lines.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Nicolas<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>On 17 May 2012 17:23, Pedro Costa <<a
href="mailto:pedrocostaarma@sapo.pt" target="_blank">pedrocostaarma@sapo.pt</a>>
wrote:<o:p></o:p></p>
<div>
<p class=MsoNormal>Great Nicolos, works...<br>
<br>
It is possible select lines from one table a less than 3 meters from lines from
another table?and delete them...<br>
<br>
thanks<br>
<br>
<br>
Em 17-05-2012 15:41, Nicolas Ribot escreveu: <o:p></o:p></p>
<div>
<div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>Hi Pedro, <o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Courier New"'>select
(st_dump(st_union(geom))).geom from lines;</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>will cut your network of lines at intersections.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>Nicolas<o:p></o:p></p>
<div>
<p class=MsoNormal>On 17 May 2012 11:57, Pedro Costa <<a
href="mailto:pedrocostaarma@sapo.pt" target="_blank">pedrocostaarma@sapo.pt</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>does anyone know how I can cut
the lines at intersectionslike the image attached?<br>
<br>
I canīt install postgis 2.0 for now....<br>
<br>
I see a few examples with st_union and st_dump but i don't understand...<br>
<br>
<br>
Thanks<br>
<br>
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<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
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