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 19:23:28 |
Message-ID: | 4C489AB0.2090900@serioustechnology.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Oliver Kohll - Mailing Lists wrote:
>
> On 22 Jul 2010, at 12:57, Geoffrey wrote:
>
>>> 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
>>
>> Disgregard my last post, Surely as soon as I hit send, the light went
>> on... I'm looking at deriving my points for point <@> point from
>> ll_to_earth().
>
> I constructed mine using point(longitude, latitude), where long and lat
> are double precision, which returns a datatype of type point.
> ll_to_earth() looks like it returns a datatype of type earth, so not
> sure if it will work. Maybe things have changed in a recent release,
> please let me know if so.
>
> So an example would be
> select point(-2.2171,56.8952)<@>point(-1.2833,51.6667) as miles;
> miles
> ------------------
> 363.202864676916
> (1 row)
Perfect, that appears to work for me as well, thanks.
>
> 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
From | Date | Subject | |
---|---|---|---|
Next Message | Piotr Gasidło | 2010-07-22 19:24:52 | Difference between EXPLAIN ANALYZE SELECT ... total runtime and SELECT ... runtime |
Previous Message | Tim Landscheidt | 2010-07-22 19:21:41 | Re: How to distribute quantity if same product is in multiple rows |