Re: [GENERAL] calculating distance between longitude and latitude
On Wed, Jun 9, 2010 at 3:02 PM, Geoffrey li...@serioustechnology.com wrote: Does postgresql have functions to calculate the distance between two sets of longitude and latitude. for posterity, if you are not: *) very interested in high performance (that is, ok w/sql implementation) *) needing super accurate results (ok with GC distance) *) wanting to deal with dependencies (postgis, earthdistance) *) interested in gist for indexed spacial searches try this: create or replace function gc_dist(_lat1 float8, _lon1 float8, _lat2 float8, _lon2 float8) returns float8 as $$ select ACOS(SIN($1)*SIN($3)+COS($1)*COS($3)*COS($4-$2))*6371; $$ language sql immutable; I took that from here: http://www.movable-type.co.uk/scripts/latlong.html postgres=# select gc_dist(42, -74, 29, -81); gc_dist -- 3725.88928230352 results in km. for serious stuff postgis is definitely the way to go. merlin -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] calculating distance between longitude and latitude
Does postgresql have functions to calculate the distance between two sets of longitude and latitude. -- 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 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] calculating distance between longitude and latitude
2010/6/9 Geoffrey li...@serioustechnology.com Does postgresql have functions to calculate the distance between two sets of longitude and latitude. -- 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 Hi, the simplest way is to use PostGis, all spatial functions are there. regards Szymon Guz
Re: [GENERAL] calculating distance between longitude and latitude
Does postgresql have functions to calculate the distance between two sets of longitude and latitude. You're looking for the earthdistance contrib module. With most Linux distros it's installed under /usr/share/postgresql/8.xx/contrib You may have to install a postgresql-contrib package depending on your distro. Typing locate earthdistance.sql should reveal the location if it's available already. To activate you'd just do a pgsql [database] /whereever/earthdistance.sql HTH Uwe -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
