Oliver Kohll - Mailing Lists wrote:
On 21 Jul 2010, at 23:14, Joe Conway <mail@xxxxxxxxxxxxx
<mailto:mail@xxxxxxxxxxxxx>> 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
Trying to figure out the proper usage. My assumptions:
use ll_to_earth() to get point values to pass to 'point <@> point'
First issue, ll_to_earth() returns three values, not one.
Second issue, I tried something like:
select (ll_to_earth(46,67)<@>ll_to_earth(57,87));
I get:
ERROR: operator does not exist: earth <@> earth
LINE 1: select (ll_to_earth(46,67)<@>ll_to_earth(57,87));
So I tried:
select (4618419.15006707<@>4394453.66154081);
And I get:
ERROR: operator does not exist: numeric <@> numeric
LINE 1: select (4618419.15006707<@>4394453.66154081);
^
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts.
What am I missing???
--
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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