postgis st_distance返回不正确的结果

Question

I am using postgis to calculate distance between 2 geo co-ordinates.

select st_distance(
  'POINT(15.651955 73.712769)'::geography, 
  'POINT(14.806993 74.131451)'::geography) AS d;

It's returning me 53536.743496517meters which is approximately equal to 54km, but the actual distance is 103km which I have calculated via http://boulter.com/gps/distance/

Am I doing anything wrong in the query ?

Answer 1

POINT() takes its arguments in longitude, latitude. Swap your arguments.

select st_distance(
  'POINT(73.712769 15.651955)'::geography, 
  'POINT(74.131451 14.806993)'::geography) AS d;

st_distance
--
103753.197677054

I make this mistake regularly, because I think in terms of latitude and longitude, not longitude and latitude.