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* select points of polygons
@ 2010-03-17 09:08 Andreas Gaab <A.Gaab@scanlab.de>
2010-03-17 14:21 ` Re: select points of polygons Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: Andreas Gaab @ 2010-03-17 09:08 UTC (permalink / raw)
To: pgsql-sql
Hi there,
I have polygons with 5 points (left, center, right, top, bottom)
Now I would like to select an individual point out of the polygon. Are there any functions to provide this in an readable manner other than:
e.g. SELECT replace(split_part(p::text,',(',1),'((','(')::point as point FROM (
SELECT '((0.001329116037,0.007391900417),(0.001371765621,0.1608393682),(0.1502391498,0.00733744679),(0.001500387404,-0.1468751078),(-0.1472653422,0.007425591447))'::polygon as p) as poly
è (0.001329116037,0.007391900417)
Thanks
Andreas
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^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: select points of polygons
2010-03-17 09:08 select points of polygons Andreas Gaab <A.Gaab@scanlab.de>
@ 2010-03-17 14:21 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2010-03-17 14:21 UTC (permalink / raw)
To: Andreas Gaab <A.Gaab@scanlab.de>; +Cc: pgsql-sql
Andreas Gaab <A.Gaab@scanlab.de> writes:
> I have polygons with 5 points (left, center, right, top, bottom)
> Now I would like to select an individual point out of the polygon. Are
> there any functions to provide this
Doesn't look like it :-(. Seems like rather an oversight.
regards, tom lane
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2010-03-17 09:08 select points of polygons Andreas Gaab <A.Gaab@scanlab.de>
2010-03-17 14:21 ` Tom Lane <tgl@sss.pgh.pa.us>
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