Subject: Re: [SQL] Latitude / Longitude
From: Larry Rosenman <ler@lerctr.org>
To: Tim Perdue <tim@perdue.net>
Cc: pgsql-general@postgresql.org, pgsql-sql@postgresql.org
In-Reply-To: <20020912124426.A27570@mail.perdue.net>
References: <20020912124426.A27570@mail.perdue.net>
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Date: 12 Sep 2002 12:49:21 -0500
Message-Id: <1031852961.380.20.camel@lerlaptop.iadfw.net>
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Look at contrib/earthdistance, I **think** it does what you need.

LER

On Thu, 2002-09-12 at 12:44, Tim Perdue wrote:
> Hi Folks -
> 
> I'm working on a global weather database for a client and have hit an issue
> which I'm sure has been solved before. Unfortunately, the site search doesn't
> pull up anything.
> 
> Essentially, I've got two tables, one with city/county/lat/long and another
> with lat/long/weather data.
> 
> None of the lat/longs in the two tables match up directly, so I can't do a
> simple join of the two tables. I need to join on closest proximity on the
> lat/long fields.
> 
> Any suggestions? It seems to me this will be pretty expensive on CPU resources
> unless there's a really elegant trick uncovered.
> 
> Tim
> 
> -- 
> Founder - PHPBuilder.com / Geocrawler.com / SourceForge
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-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 972-414-9812                 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749