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</v:background></xml><![endif]--><div class=WordSection1><p class=MsoNormal>I created a table of ST_ClosestPoint()s to polylines.  I assumed that if the closest points were on the line the queries below would give equal results, but that’s not happening.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“InsideWorking”.simplified is a line.<o:p></o:p></p><p class=MsoNormal>“gaps”.closeststartpoint is a point.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT "gaps".closeststartpoint FROM "gaps" <o:p></o:p></p><p class=MsoNormal>WHERE "gaps".closeststartpoint IS NOT NULL; --Query produces 462 results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT * FROM "gaps","InsideWorking" <o:p></o:p></p><p class=MsoNormal>WHERE ST_Covers("InsideWorking".simplified,"gaps".closeststartpoint); --Query produces 1228 results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT * FROM "gaps","InsideWorking" <o:p></o:p></p><p class=MsoNormal>WHERE ST_Contains("InsideWorking".simplified,"gaps".closeststartpoint); --Query produces 548 results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT "gaps".closeststartpoint FROM "gaps","InsideWorking" <o:p></o:p></p><p class=MsoNormal>WHERE ST_Touches("InsideWorking".simplified,"gaps".closeststartpoint); --Query produces 680 results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>--------------------------------------------------------------------------------------------------------------------<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT "gaps".closeststartpoint FROM "gaps","InsideWorking" <o:p></o:p></p><p class=MsoNormal>WHERE ST_DWithin("InsideWorking".simplified,"gaps".closeststartpoint,0); --Query produces 1258 results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Inspection shows the ST_DWithin() query is getting better results than the other queries.  So I think I’ve got something that works, but I’d appreciate some advice on why the others don’t give similar results.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance.<o:p></o:p></p></div></body></html>