<div dir="ltr">Thank you Hugues,<div><br></div><div>Your suggestion worked. I still have some problems understanding why my query did not work, but I will give it some thought.</div><div><br></div><div>Andreas</div><div><br>
</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-02-17 12:09 GMT+01:00 Hugues François <span dir="ltr"><<a href="mailto:hugues.francois@irstea.fr" target="_blank">hugues.francois@irstea.fr</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span>Hello,</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span>Maybe the issue is the number of polygon which not
intersect between your tables : this query will return you all g1 polygon any
times it does not intersect one polygon in your g2 table (I don't know if I'm
clear enought, but a g1 polygon where g2 exists will also be returned since it
does not intersect others g2 polygon)</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span>I think you could try </span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff"><span><font color="#000000">SELECT </font><font color="#000000">name, geom INTO
gadm2_level1_union_selected</font></span></font></div>
<div dir="ltr" align="left"><font color="#0000ff"><span><font color="#000000">FROM </font></span></font></div>
<div dir="ltr" align="left"><font color="#0000ff"><span><font color="#000000">(SELECT g1.*, g2.gid AS g2_gid FROM gadm2_level1_union
g1</font></span></font></div>
<div dir="ltr" align="left"><span>LEFT JOIN
gadm2_level2_union g2 ON ST_Intersects(g1.centroid, g2.geom)) foo</span></div>
<div dir="ltr" align="left"><font color="#0000ff"><span></span></font><font color="#0000ff"><span><font color="#000000">WHERE g2_gid is
null</font></span></font></div>
<div dir="ltr" align="left"><font color="#000000"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"><span>Hugues.</span></font></div>
<div align="left"><font face="Arial"></font> </div><br>
<div dir="ltr" lang="fr" align="left">
<hr>
<font face="Tahoma"><b>From:</b> <a href="mailto:postgis-users-bounces@lists.osgeo.org" target="_blank">postgis-users-bounces@lists.osgeo.org</a>
[mailto:<a href="mailto:postgis-users-bounces@lists.osgeo.org" target="_blank">postgis-users-bounces@lists.osgeo.org</a>] <b>On Behalf Of </b>Andreas Forø
Tollefsen<br><b>Sent:</b> Monday, February 17, 2014 11:49 AM<br><b>To:</b>
PostGIS Users Discussion<br><b>Subject:</b> [postgis-users] Point, Polygon -
Does not intersects<br></font><br></div><div><div class="h5">
<div></div>
<div dir="ltr">Hi,
<div><br></div>
<div>I am running the current setup:</div>
<div> "POSTGIS="2.0.2 r10789" GEOS="3.4.0dev-CAPI-1.8.0" PROJ="Rel. 4.7.1,
23 September 2009" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.7.8" (core
procs from "2.0.1 r9979" need upgrade) RASTER (raster procs from "2.0.1 r9979"
need upgrade)"</div>
<div><br></div>
<div>I have two tables with geometries. Both include polygons representing
administrative units. One at the first level and one at the second level.</div>
<div>I want a table that includes all the second level polygons where available,
and where not available I want the first level polygons.</div>
<div><br></div>
<div>To find the level 1 polygons for filling the gaps where level 2 is N/A, I
thought about finding where the centroid of level one polygons does not
intersects with the polygons for level 2.</div>
<div><br></div>
<div>Hence, I tried:</div>
<div>
<div><br></div>
<div>SELECT <a href="http://g1.name" target="_blank">g1.name</a>, g1.geom INTO
gadm2_level1_union_selected FROM gadm2_level1_union g1, gadm2_level2_union g2
WHERE ST_Intersects(g1.centroid, g2.geom)=FALSE;</div>
<div><font color="#0000ff" face="Arial"></font><br></div>
<div>I also tried the ST_Disjoint(g1.centroid, g2.geom).</div>
<div><br></div>
<div>My problem is that this is running for ages without finishing. This should
be such a simple query, but I have used half of the day running it. If I take
the two geometries into PostGIS and run a spatial query to find the points from
level 1 not intersecting with polygons of level 2, it takes 15 seconds.</div>
<div><br></div>
<div>What could be the issue with my query?</div>
<div><br></div>
<div>Thanks!</div>
<div>Andreas</div>
<div><br></div></div></div></div></div></div>
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