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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks Paul!<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Från:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> postgis-users [mailto:postgis-users-bounces@lists.osgeo.org]
<b>För </b>Paul Ramsey<br>
<b>Skickat:</b> den 13 augusti 2019 17:16<br>
<b>Till:</b> PostGIS Users Discussion<br>
<b>Ämne:</b> Re: [postgis-users] Interior rings<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You’re going to want to chain a ST_DumpRings (turn polygons to rings) to an ST_Dump (turn mutlis to singletons) and then look at the dump ring composite type and omit ring 1 from the relation…<o:p></o:p></p>
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<p class="MsoNormal">Something like:<o:p></o:p></p>
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WITH <br>
poly AS (<br>
SELECT 'MULTIPOLYGON(((0 0, 0 10, 10 10, 10 0, 0 0), (4 4, 4 5, 5 5, 5 4, 4 4)))'::geometry AS g<br>
),<br>
rings AS (<br>
SELECT (ST_DumpRings((ST_Dump(g)).geom)).* FROM poly<br>
)<br>
SELECT * FROM rings<br>
WHERE path != '{0}';<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal">On Aug 13, 2019, at 7:39 AM, <<a href="mailto:paul.malm@lfv.se">paul.malm@lfv.se</a>> <<a href="mailto:paul.malm@lfv.se">paul.malm@lfv.se</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hi, I would like to create a table with all the interior rings (islands) from a table with multipolygons lakes.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I’ve only come this far:</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">CREATE TABLE "islands" AS SELECT (ST_InteriorRingn(the_geom, 2)).geometry AS the_geom FROM public."lakes";</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">But this is only collecting the first island in each lake.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thankful for any suggestions.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">/Paul<span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">_______________________________________________<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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