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In the case of lines, I think GEOS Unary Union just delegates to
union(lines, empty point). So you could try running st_union(lines,
empty point) and see if that works.<br>
<br>
If this doesn't work, it could just be a case where the snapping
heuristic tolerances aren't being set large enough to handle the
linework. Or, it could be some other limitation... <br>
<br>
If the problem persists, if you can send me a sample dataset (as
shapefile or WKB file) which shows the problem, I can try and see if
JTS has the same problem and if there's an obvious fix.<br>
<br>
Martin<br>
<br>
On 1/13/2011 9:54 PM, <a class="moz-txt-link-abbreviated" href="mailto:James.Sewell@lisasoft.com">James.Sewell@lisasoft.com</a> wrote:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thanks
Martin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">I’ll
install the latest nightly build of GEOS, recompile PostGIS
and hope for the best.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Reading
the thread does that mean that st_union(geom, geom) should
work in this case? I had previously done some testing and it
didn’t seem to, I’ll test again though.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif"; color: rgb(31,
73, 125);">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif"; color:
rgb(153, 153, 153);">James Sewell </span><span
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif"; color:
windowtext;" lang="EN-US">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif"; color:
windowtext;" lang="EN-US">
<a class="moz-txt-link-abbreviated" href="mailto:geos-devel-bounces@lists.osgeo.org">geos-devel-bounces@lists.osgeo.org</a>
[<a class="moz-txt-link-freetext" href="mailto:geos-devel-bounces@lists.osgeo.org">mailto:geos-devel-bounces@lists.osgeo.org</a>] <b>On
Behalf Of </b>Martin Davis<br>
<b>Sent:</b> Friday, 14 January 2011 2:51 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:geos-devel@lists.osgeo.org">geos-devel@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [geos-devel] RE: GEOS errors from
PostGIS<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">James,<br>
<br>
I suspect this may be caused by a known bug in the Unary
union. This was identified in this thread on the JTS list:<br>
<br>
<a moz-do-not-send="true"
href="http://sourceforge.net/mailarchive/forum.php?thread_name=4C0FB4A5.2010304%40refractions.net&forum_name=jts-topo-suite-user">http://sourceforge.net/mailarchive/forum.php?thread_name=4C0FB4A5.2010304%40refractions.net&forum_name=jts-topo-suite-user</a><br>
<br>
I fixed this in JTS, in the soon-to-be-released ver 1.12.
Perhaps this fix hasn't made it's way into GEOS and PostGIS
yet.<br>
<br>
The thing to do is to get this fixed in GEOS, rolled into
PostGIS, and then you can retest your union case.<br>
<br>
Martin<br>
<br>
On 1/11/2011 6:23 PM, <a moz-do-not-send="true"
href="mailto:James.Sewell@lisasoft.com">James.Sewell@lisasoft.com</a>
wrote: <o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Sorry,
I didn’t include the actual error:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">An
example is:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal">NOTICE: TopologyException: found non-noded
intersection between LINESTRING (143.861 -36.881, 143.861
-36.881) and LINESTRING (143.861 -36.881, 143.861 -36.881) at
143.861 -36.881<o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">This
particular one is a two very small identical lines, this
isn’t always the case but seems to be the majority of the
time.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif";">Cheers,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif"; color:
rgb(153, 153, 153);">James Sewell <br>
Developer <br>
LISAsoft </span><o:p></o:p></p>
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font-family: "Verdana","sans-serif";
color: rgb(153, 153, 153);">Ph: </span></b><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif"; color:
rgb(153, 153, 153);">+61 3 8680 3250 <b>Fax: </b>+61 3
8680 3299 <br>
Level 9, 601 Bourke St, Melbourne Vic 3000</span><o:p></o:p></p>
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LISAsoft is part of the A2end Group of Companies<br>
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
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lang="EN-US">From:</span></b><span style="font-size:
10pt; font-family:
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<a moz-do-not-send="true"
href="mailto:James.Sewell@lisasoft.com">James.Sewell@lisasoft.com</a>
<br>
<b>Sent:</b> Wednesday, 12 January 2011 12:06 PM<br>
<b>To:</b> '<a moz-do-not-send="true"
href="mailto:geos-devel@lists.osgeo.org">geos-devel@lists.osgeo.org</a>'<br>
<b>Subject:</b> GEOS errors from PostGIS</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hello All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am currently creating an OSS Python app
which uses PostGIS (and thus GEOS) to combines multiple layers
and carries through attributes.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am using a method derived from Paul
Ramsey’s <a moz-do-not-send="true"
href="http://s3.opengeo.org/postgis-power.pdf">http://s3.opengeo.org/postgis-power.pdf</a>
document. The steps I am taking are as follows:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent: -18pt;">Take the
left and right layers and split them into smaller segments<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent: -18pt;">Iterate
through the segments doing the following:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 72pt;
text-indent: -18pt;">Use the following to dump each side to
linework<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 72pt;"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;">SELECT
ST_Collect(a.the_geom) AS the_geom <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;"> FROM
(SELECT <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;"> (ST_Dump<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">
(ST_Exteriorring(<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">
(ST_Dumprings(<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">
(ST_Dump(the_geom)).geom)).geom))).geom AS the_geom<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 72pt;
text-indent: -18pt;">Put two resulting multi-polygons into a
table, make sure they are valid (and all encapsulated polys
are valid), and union to remove overlap as follows<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;">SELECT
ST_Union(ST_snaptogrid(the_geom,10E-10)) AS the_geom <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;"> <o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 72pt;
text-indent: -18pt;">Build the polygons back up as follows<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;">SELECT
a.the_geom AS the_geom, <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;"> ST_pointonsurface(a.the_geom)
AS point, <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;"> 0
AS leftgid, 0 AS rightgid <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt; text-indent:
36pt;">FROM (SELECT (ST_Dump(ST_polygonize(the_geom))).geom AS
the_geom<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;"> <o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 72pt;
text-indent: -18pt;">Then use an overlay to map the attributes
back through from the left and the right.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The process works, however I am getting
problems with GEOS Non Noded Intersection <span style="color:
rgb(31, 73, 125);">(“GEOS union() threw an error!”) </span>crashes
in some areas. These can often be fixed by rearranging the
data (importing in a different order, snapping to a slightly
different grid etc...). <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">When a failure occurs I am given two
linestrings and a point, however these usually bear no
relationship to the lines in either the expected output, the
left or the right side other than being in the same area.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Unfortunately I can’t provide data at the
moment as any attempt to reduce the size of the dataset seems
to remove (or relocate) the problem. I will try and get
permission to release some data from the customer, but this
will take some time.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">One thing to note is that the layers I am
combining contain very complex and very similar linework. It
would not be unexpected to get 10 sets of similar but not
identical linework all running around an area. This is
acceptable for the end product, but I am wondering if it is
upsetting the Union somehow?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">If anyone has any ideas they would be most
appreciated.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left: 108pt;"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 72pt;">
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif";">Cheers,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 9pt; font-family:
"Verdana","sans-serif";">James Sewell <br>
Developer <br>
LISAsoft </span><o:p></o:p></p>
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color: rgb(153, 153, 153);">Ph: </span></b><span
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"Verdana","sans-serif";">+61 3 8680
3250 <b>Fax: </b>+61 3 8680 3299 <br>
Level 9, 601 Bourke St, Melbourne Vic 3000</span><o:p></o:p></p>
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LISAsoft is part of the A2end Group of Companies<br>
<a moz-do-not-send="true" href="http://www.ardec.com.au/"><span
style="color: rgb(79, 129, 189); text-decoration: none;">http://www.ardec.com.au</span></a><br>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>geos-devel mailing list<o:p></o:p></pre>
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<pre><a moz-do-not-send="true" href="http://lists.osgeo.org/mailman/listinfo/geos-devel">http://lists.osgeo.org/mailman/listinfo/geos-devel</a><o:p></o:p></pre>
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<p class="avgcert">No virus found in this message.<br>
Checked by AVG - <a moz-do-not-send="true"
href="http://www.avg.com">www.avg.com</a><br>
Version: 10.0.1191 / Virus Database: 1435/3373 - Release Date:
01/11/11<o:p></o:p></p>
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<p class="avgcert" color="#000000" align="left">No virus found in
this message.<br>
Checked by AVG - <a moz-do-not-send="true"
href="http://www.avg.com">www.avg.com</a><br>
Version: 10.0.1191 / Virus Database: 1435/3377 - Release Date:
01/13/11</p>
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