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
oli...@agilebase.co.uk <mailto:oli...@agilebase.co.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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