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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">You might look to this post:
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<div><a href="http://sorokine.blogspot.com/2011/05/postgis-function-for-random-point.html" target="_blank">http://sorokine.blogspot.com/2011/05/postgis-function-for-random-point.html</a></div>
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<div>Best,<br>
Steve<br>
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<p class="MsoNormal"><img src="http://sig.cmparks.net/cmp-ms-90x122.png" alt="http://sig.cmparks.net/cmp-ms-90x122.png" align="left" height="122" hspace="12" width="90">
<span style="font-size:14.0pt; font-family:"Arial","sans-serif"; color:#006C56">Stephen V. Mather<br>
</span><span style="font-size:11.0pt; font-family:"Arial","sans-serif"; color:#006C56">GIS Manager<br>
</span><span style="font-size:9.0pt; font-family:"Arial","sans-serif"; color:#006C56">(216) 635-3243 (Work)
</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"><a href="http://www.clemetparks.com" target="_blank"><span style=""><br>
clevelandmetroparks.com</span></a></span></p>
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<div id="divRpF390052" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> postgis-users-bounces@lists.osgeo.org [postgis-users-bounces@lists.osgeo.org] on behalf of Luis Carrasco [leca00@gmail.com]<br>
<b>Sent:</b> Tuesday, January 29, 2013 1:53 PM<br>
<b>To:</b> postgis-users@lists.osgeo.org<br>
<b>Subject:</b> [postgis-users] Request to develop st_pointonsurface variant to output a random point (not an arbitrary one)<br>
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<div>Hello,<br>
<br>
This is more of a wishlist item. I've tried using st_pointonsurface as part of a point geomasking routine but all the points I get follow the same pattern of angle and direction. Could a new function be integrated into postgis where the output point has a random
location within a surface? I'm solving my problem by using a different approach for my purposes which ends being a little more complicated (therefore, this request), but I think returning a true random point could help other colleagues as well when working
with a large dataset.<br>
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Thanks,<br>
<br>
Luis<br clear="all">
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<div style="margin-top:0; margin-bottom:0"><font face="Arial"><span style="font-size:10pt">Luis Eduardo Carrasco, Ph.D.</span></font>
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<font face="Arial"><span style="font-size:10pt">Spatial Analyst</span></font> <br>
<font face="Arial"><span style="font-size:10pt">Health & Spatial Analysis Unit</span></font><font face="Times New Roman" size="3"><span style="font-size:12pt">
</span></font><font face="Times New Roman" size="3"><span style="font-size:12pt"><br>
</span></font><font face="Arial"><span style="font-size:10pt">State Center for Health Statistics &</span></font>
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<font face="Arial"><span style="font-size:10pt">UNC</span></font> <font face="Arial">
<span style="font-size:10pt">Lineberger Comprehensive Cancer Center</span></font>
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<font face="Arial"><span style="font-size:10pt">Department of Health and Human Services</span></font>
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