[postgis-users] ST_DWithin, ST_Distance and <->

[Eric St-Georges]

Hi,

Looking for official documentation or guidance regarding the usage of
ST_DWithin, ST_Distance and <->, especially when it comes to using
indices. For example, the ST_Distance page[1] itself doesn't mention
that the function will not use indices.
For example: 
If I want to get the closest point to another, why can't ST_Distance use
an index, but <-> can?Is there anyway to get a distance in meters or some other unit from the
<-> operator on geography types?if ST_DWithin and <-> and other similar functions/operators should be
used when dealing with distance, what's the use case for ST_Distance?
Regards,
Eric St-Georges


Links:

  1. https://postgis.net/docs/ST_Distance.html
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