[postgis-devel] Lacking of exact knn-gist?
maplabs at light42.com
maplabs at light42.com
Fri Jun 27 10:48:11 PDT 2014
Alexander -
there are some images here that might be useful..
I dont know exactly what the question is, but, this post is an attempt
at showing several distance searchs and the results.
http://blog.light42.com/wordpress/?p=102
--
Brian M Hamlin
OSGeo California Chapter
blog.light42.com
On Fri, 27 Jun 2014 21:29:58 +0400, Alexander Korotkov wrote:
Hi!
Turning back to this topic. Could you prepare dump and SQL examples, please?
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With best regards,
Alexander Korotkov.
On Fri, Jan 17, 2014 at 6:04 PM, Paul Ramsey
wrote:
Alex,
This piece of the workshop gives some visuals about how unpleasant
reasoning abound nearest neighbour using boxes is. (It’s almost
embarrassing trying to explain it to people)
http://workshops.boundlessgeo.com/postgis-intro/knn.html
You can pull the NYC roads data from the associated data package and
replicate the results.
I can prepare something more plug-n-play (dump file and SQL examples)
when I get back home if needed.
P.
--
Paul Ramsey
http://cleverelephant.cahttp://postgis.net
On January 17, 2014 at 9:01:33 AM, Alexander Korotkov
(aekorotkov at gmail.com) wrote:
You may take a look at my patch to PostgreSQL enabling exact knn-gist:
http://www.postgresql.org/message-id/CAPpHfdu_qBLNRnv-r=_tofZYYa6-r=Z5_MGF4_phAOkWcYxfRg@mail.gmail.com
Ideally, it could be in 9.4. But I expect serious critics about
accessing heap from gist is fundamentally bad design.
Test cases are very welcome. It would be very nice to have them
before January 19. I know it very soon, but in this case I can
include them to PGCon proposal.
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