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<div class="moz-cite-prefix"><font size="-1">Hi Charles<br>
<br>
To explode geomteries, you can use st_dump<br>
<br>
e.g.<br>
<br>
<font face="Courier New, Courier, monospace">select<br>
gid,<br>
st_geometrytype(the_geom) as orig_geom_type, <br>
st_nrings(the_geom) as orig_geom_number_rings,<br>
st_geometrytype((st_dump(the_geom)).geom) as dumped_geom_type,<br>
(st_dump(the_geom)).path as dumped_geom_ordinal_num,<br>
(st_dump(the_geom)).geom as dumped_geom,<br>
main_place<br>
from static_main_place <br>
order by 1,5<br>
<br>
(see my pic below with some comments and the result...)<br>
</font><br>
<img alt="st_dump_example" src="cid:part1.02000404.05010408@lidwala.com" height="513" width="1297"><br>
<br>
<br>
<br>
<br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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On 14/03/14 17:04, Charles Rethman wrote:<br>
</div>
<blockquote cite="mid:BBC2E039-9C96-4DB8-B622-599E8AD6EA2F@me.com" type="cite">
<div>Hello PostGIS experts out there, I have a technical question for you all...</div>
<div><br>
</div>
<div>I need to effect 'clips' in PostGIS and I have tried using ST_Difference. I got very messy outputs and then I read in the PostGis Manual the the function doesn't work with Collections. In importing my shape file data into PostGIS, I created multi-polygon
geometries--so I presume that is why the ST_Difference function won't give me sensible results.</div>
<div><br>
</div>
<div>Is there a function or a way in PostGIS of converting multi-polygons into single polygons (a kind of 'explode' function) so that I don't have to re-import all my shape files (I really HATE those old shape files!)</div>
<div><br>
</div>
<div>I am using PostGIS 2.1 on postgres 9.3...</div>
<div><br>
</div>
<div>Thank you for your time,</div>
<div><br>
<div>
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Rethman</span><br style="color: rgb(0, 0, 0);
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float: none; display: inline !important;"><font face="GillSans-Light">Director,<span class="Apple-converted-space"> </span></font><font face="GillSans-LightItalic"><i>Cape
Town Office</i></font></span><br style="color: rgb(0, 0, 0); font-variant: normal;
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<font color="#77787a">Cell: +27 71 6735502</font></div>
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