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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’m not sure I understand your whole problem, but I can try to give you the beginning of some answers :<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The use of ST_Overlaps seems more natural to me to find overlapping geometries (it depends on what you’re looking for, and you may also have look to ST_Intersects but ST_Contains does not return the same kind of results)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>To compare geometries within a single layer, you can make an auto jointure and a select distinct to remove duplicates. Something like this query may work :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SELECT DISTINCT a.* FROM table AS a, table AS b<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>WHERE a.gid != b.gid and ST_Overlap(a.geom, b.geom) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>HTH<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hugues.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> postgis-users-bounces@lists.osgeo.org [mailto:postgis-users-bounces@lists.osgeo.org] <b>De la part de</b> volker.emmel@lwk-rlp.de<br><b>Envoyé :</b> jeudi 26 février 2015 14:33<br><b>À :</b> postgis-users@lists.osgeo.org<br><b>Objet :</b> [postgis-users] overlapping geometries<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>hey list,</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>i have the following problem:</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>- i have overlapping geometries in one layer in my postgis (8.3) database.</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-> how could i find the overlapping geometries??</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>->i could not divide into two layers...</span> <br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-> if i have two layers i could use st_contain, but in one ??</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>- it will be over 6 million geometries....</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>any idea?</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>thanks</span> <br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>vollbtz</span><o:p></o:p></p></div></body></html>