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I am trying to use POSTGIS to find all the outer points when I have alot of points? How would I go about doing this and and I cant seem to find a command for it.
Thanks for some good comments I made it work using.
SELECT ST_ASGEOJSON((ST_DumpPoints(ST_ConvexHull(st_collect(geog::geometry)))).geom) FROM sources;
Required, but never shown