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From: Bruno Wolff III <bruno@wolff.to>
To: Oleg Bartunov <oleg@sai.msu.su>
Cc: Michael Fuhr <mike@fuhr.org>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Dan Harris <fbsd@drivefaster.net>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Help optimizing a slow index scan
Date: Sat, 18 Mar 2006 09:00:19 -0600
Message-ID: <20060318150019.GA8398@wolff.to> (raw)
In-Reply-To: <Pine.GSO.4.63.0603181147240.22593@ra.sai.msu.su>
References: <4419DB50.10404@drivefaster.net>
	<b42b73150603170856j588b268bjd89ce769f4ac7a28@mail.gmail.com>
	<441B1FC6.60001@drivefaster.net>
	<12823.1142656871@sss.pgh.pa.us>
	<20060318052941.GA46733@winnie.fuhr.org>
	<Pine.GSO.4.63.0603181147240.22593@ra.sai.msu.su>

On Sat, Mar 18, 2006 at 11:50:48 +0300,
  Oleg Bartunov <oleg@sai.msu.su> wrote:
> I may be wrong but we in astronomy have several sky indexing schemes, which
> allows to effectively use classical btree index. See 
> http://www.sai.msu.su/~megera/oddmuse/index.cgi/SkyPixelization
> for details. Sergei Koposov has developed Q3C contrib module for 
> PostgreSQL 8.1+ and we use it with billiard size astronomical catalogs.

Note that Earth Distance can also be used for astronomy. If you use an
appropiate radius, distances will be in degrees.

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