Re: Wrong distance shown in miles for extension earthdistance

On Mon, Mar 22, 2021 at 9:27 AM PG Doc comments form
<noreply(at)postgresql(dot)org> wrote:
>
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/10/earthdistance.html
> Description:
>
> Hi,
> I have installed
> CREATE EXTENSION CUBE;
> CREATE EXTENSION earthdistance;
>
> Post which I ran the following query:
> SELECT (POINT (19.974, 72.756)<@> POINT (19.195, 72.959)) AS DISTANCE;
>
> The answer came back as 21.17534 miles whereas the actual distance (as crow
> flies) is 55.42 miles which I have checked from 2-3 websites. (Google maps
> gives a greater distance which is travel by road & this value has been
> ignored).
>
> I know both the places and the distance between both of them cannot be 22
> miles. It has to be in excess of 50 miles atleast. What am I missing?

By your queasy it looks like you are comparing two points in the Norwegian Sea.

I think you may have swapped your latitude and longitude, and are
actually looking for:

postgres=# SELECT (POINT (72.756, 19.974)<@> POINT (72.959, 19.195))
AS DISTANCE;
distance
--------------------
55.421996899143366

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Magnus Hagander
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