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    <div class="moz-cite-prefix">Hi Francois.<br>
      <br>
      This work!<br>
      <br>
      Could be a bug in st_difference?<br>
      <br>
      Thanks, Ángel<br>
      <br>
      On 12/11/12 12:42, Francois Hugues wrote:<br>
    </div>
    <blockquote
cite="mid:3CB901080554B04881D30F111F62D9300229FD1D@nadia.grenoble.cemagref.fr"
      type="cite">
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      <div dir="ltr" align="left"><span class="554124111-12112012"><font
            size="2" color="#0000ff" face="Arial">You should try the
            st_buffer tip :</font></span></div>
      <div dir="ltr" align="left"><span class="554124111-12112012"></span> </div>
      <div dir="ltr" align="left"><span class="554124111-12112012">select
          st_astext(<br>
              st_difference(<br>
                  st_buffer(st_geomfromtext('POLYGON((-5.66666
          43.53301,-5.66704 43.53335,-5.66931 43.53374,-5.66975299919511
          43.533380063154,-5.66979 43.53335,-5.66971
          43.53478,-5.66969091189271 43.5348058613067,-5.67026768864541
          43.5374211525033,-5.67084666354158 43.5376334432986,-5.67111
          43.53773,-5.67059550578171 43.53754135212,-5.66854
          43.53971,-5.66854 43.53971,-5.66854 43.53971,-5.66758
          43.53976,-5.6665 43.5402,-5.6665 43.5402,-5.66609712188377
          43.539781395014,-5.66401 43.54013,-5.66401
          43.54013,-5.66351576708437 43.5392869195307,-5.66281
          43.53909,-5.6626 43.53851,-5.66159162498075
          43.5369268527413,-5.66131 43.53695,-5.66196
          43.53617,-5.66272791899155 43.5356642562857,-5.66378432333548
          43.5344801289574,-5.66384 43.53414,-5.66452 43.53344,-5.6656
          43.53337,-5.66611 43.5331,-5.66666 43.53301))', 4326),0),<br>
                 st_buffer(st_geomfromtext('POLYGON((-5.66577
          43.53447,-5.66612 43.53455,-5.66675167677363
          43.5349178897119,-5.66735 43.53529,-5.66811 43.5355,-5.66786
          43.53678,-5.66816 43.53697,-5.66801 43.53717,-5.66729498033211
          43.5375449497042,-5.6665 43.53782,-5.66634200990626
          43.5386936730934,-5.66634 43.53876,-5.66554366174751
          43.5384386684555,-5.66521 43.53856,-5.66457
          43.53781,-5.6640744056249 43.5375662650614,-5.66341231504476
          43.5372589777288,-5.66324 43.53718,-5.66334987968078
          43.536344363177,-5.66304550704754 43.5357063513112,-5.66299
          43.53559,-5.66358 43.53544,-5.66413 43.53529,-5.66521
          43.535,-5.66577 43.53447,-5.66577 43.53447))', 4326),0)<br>
              )<br>
          );</span></div>
      <div><span class="554124111-12112012"></span> </div>
      <div><span class="554124111-12112012"><font size="2"
            color="#0000ff" face="Arial">Hugues.</font></span></div>
      <div dir="ltr" align="left"><br>
        <br>
      </div>
      <br>
      <div dir="ltr" class="OutlookMessageHeader" align="left" lang="fr">
        <hr tabindex="-1">
        <font size="2" face="Tahoma"><b>De :</b>
          <a class="moz-txt-link-abbreviated" href="mailto:postgis-users-bounces@lists.osgeo.org">postgis-users-bounces@lists.osgeo.org</a>
          [<a class="moz-txt-link-freetext" href="mailto:postgis-users-bounces@lists.osgeo.org">mailto:postgis-users-bounces@lists.osgeo.org</a>] <b>De la part
            de</b> Angel Cervera Claudio<br>
          <b>Envoyé :</b> lundi 12 novembre 2012 12:23<br>
          <b>À :</b> <a class="moz-txt-link-abbreviated" href="mailto:postgis-users@lists.osgeo.org">postgis-users@lists.osgeo.org</a><br>
          <b>Objet :</b> [postgis-users] st_difference throws an error<br>
        </font><br>
      </div>
      <tt>Hello.<br>
        <br>
        I post this problem in <a moz-do-not-send="true"
          class="moz-txt-link-freetext"
href="http://gis.stackexchange.com/questions/40872/st-difference-throws-an-error">http://gis.stackexchange.com/questions/40872/st-difference-throws-an-error</a>
        buy i'm sure in this mailing list people can help me.<br>
        <br>
        I'm retrieving "</tt><code>GEOSDifference: TopologyException:
        found non-noded intersection between</code><tt>" error when
        executing st_difference sql.<br>
        <br>
        Followed an example:<br>
        <br>
        Error: </tt><br>
      <pre><code>ERROR:  GEOSDifference: TopologyException: found non-noded intersection between LINESTRING (-5.67027 43.5374, -5.67085 43.5376) and LINESTRING (-5.67111 43.5377, -5.6706 43.5375) at -5.6708422794605911 43.537631835802237
SQL:
</code><code>select st_astext(
    st_difference(
        st_geomfromtext('POLYGON((-5.66666 43.53301,-5.66704 43.53335,-5.66931 43.53374,-5.66975299919511 43.533380063154,-5.66979 43.53335,-5.66971 43.53478,-5.66969091189271 43.5348058613067,-5.67026768864541 43.5374211525033,-5.67084666354158 43.5376334432986,-5.67111 43.53773,-5.67059550578171 43.53754135212,-5.66854 43.53971,-5.66854 43.53971,-5.66854 43.53971,-5.66758 43.53976,-5.6665 43.5402,-5.6665 43.5402,-5.66609712188377 43.539781395014,-5.66401 43.54013,-5.66401 43.54013,-5.66351576708437 43.5392869195307,-5.66281 43.53909,-5.6626 43.53851,-5.66159162498075 43.5369268527413,-5.66131 43.53695,-5.66196 43.53617,-5.66272791899155 43.5356642562857,-5.66378432333548 43.5344801289574,-5.66384 43.53414,-5.66452 43.53344,-5.6656 43.53337,-5.66611 43.5331,-5.66666 43.53301))', 4326),
        st_geomfromtext('POLYGON((-5.66577 43.53447,-5.66612 43.53455,-5.66675167677363 43.5349178897119,-5.66735 43.53529,-5.66811 43.5355,-5.66786 43.53678,-5.66816 43.53697,-5.66801 43.53717,-5.66729498033211 43.5375449497042,-5.6665 43.53782,-5.66634200990626 43.5386936730934,-5.66634 43.53876,-5.66554366174751 43.5384386684555,-5.66521 43.53856,-5.66457 43.53781,-5.6640744056249 43.5375662650614,-5.66341231504476 43.5372589777288,-5.66324 43.53718,-5.66334987968078 43.536344363177,-5.66304550704754 43.5357063513112,-5.66299 43.53559,-5.66358 43.53544,-5.66413 43.53529,-5.66521 43.535,-5.66577 43.53447,-5.66577 43.53447))', 4326)
    )
);</code>

In <tt>gis.stackexchange.com i attached images with various shapes with this problem. 
</tt>All share a common pattern. Some parts of edge are near to be parallel.


How to resolve this problem? Is a bug?

Thanks!
</pre>
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