From: | Geoffrey <lists(at)serioustechnology(dot)com> |
---|---|
To: | Oliver Kohll - Mailing Lists <oliver(dot)lists(at)gtwm(dot)co(dot)uk> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: locating cities within a radius of another |
Date: | 2010-07-22 11:56:02 |
Message-ID: | 4C4831D2.3090302@serioustechnology.com |
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Lists: | pgsql-general |
Oliver Kohll - Mailing Lists wrote:
>
> On 21 Jul 2010, at 23:14, Joe Conway <mail(at)joeconway(dot)com
> <mailto:mail(at)joeconway(dot)com>> wrote:
>
>> If you want something simple, and not requiring PostGIS, but plpgsql
>> instead, see:
>>
>> http://archives.postgresql.org/pgsql-sql/2003-12/msg00193.php
>
> For completeness, the earthdistance module also provides the distance
> between two lat/longs, the point<@>point syntax is simple to use:
> http://www.postgresql.org/docs/8.3/static/earthdistance.html
I did look at earthdistance before. Revisiting it now, thanks.
So, I'm trying to figure out this syntax. The docs say:
point <@> point - float8 - gives the distance in statue miles between
two points on the Earth's surface.
How does longitude and latitude fit into this picture? I can't find any
other documentation or examples?
I've got the contrib mods installed as 'select earth()' works fine.
>
> Regards
> Oliver Kohll
>
> oliver(at)agilebase(dot)co(dot)uk <mailto:oliver(at)agilebase(dot)co(dot)uk> / +44(0)7814
> 828608 / skype:okohll
> www.agilebase.co.uk <http://www.agilebase.co.uk> - software
>
--
Until later, Geoffrey
"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson
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