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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Paul,<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I think it’s a waste of time.  Your
best bet is to collect your geometries into groups an do a convex hull of each
group and then the convexhull of the convexhulls<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Leo<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.postgis.us/">http://www.postgis.us</a><o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
postgis-users-bounces@postgis.refractions.net
[mailto:postgis-users-bounces@postgis.refractions.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Paul & Caroline Lewis<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 27, 2011
5:32 AM<br>
<b><span style='font-weight:bold'>To:</span></b> PostGIS Users<br>
<b><span style='font-weight:bold'>Subject:</span></b> [postgis-users] Array
Size Error</span></font><o:p></o:p></p>

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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>

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<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Thanks for the responses. Have changed the original query
from this:<br>
 <br>
SELECT ST_ConvexHull(ST_Collect(ST_Force_2D(geom))) FROM table001<br>
 <br>
to this:<br>
 <br>
SELECT ST_ConvexHull(ST_MemUnion(geom)) FROM table001<br>
 <br>
and its still running; over 12 hours now.<br>
Is this a waste of time.<br>
I'm trying it this way as I guessed it could be an aggregate approach
issue after reading this post from Paul:<br>
 <br>
<a
href="http://blog.cleverelephant.ca/2009/01/must-faster-unions-in-postgis-14.html">http://blog.cleverelephant.ca/2009/01/must-faster-unions-in-postgis-14.html</a><br>
 <br>
and was wondering if the union operation might work for my current
requirements so set it running yesterday. <br>
The ST_Union gives the same array size error after a few seconds but as I said
the ST_MemUnion is still running, but is it working or going to work!!!<br>
 <br>
Anyway, thanks again for your feedback.<br>
 <br>
Paul<br>
<br>
 <o:p></o:p></span></font></p>

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