Its point structure supports 4 dimensions, but I'm not sure if the Z and M components are part of the distance calculation. https://postgis.net/docs/manual-3.0

Its point structure supports 4 dimensions, but I'm not sure if the Z and M components are part of the distance calculation. https://postgis.net/docs/manual-3.0/ST_MakePoint.html https://postgis.net/docs/manual-3.0/ST_MakePoint.html Edit: The distance operations are 2D by default and it looks like there are only 3D variants. https://postgis.net/docs/manual-3.0/ST_3DDistance.html https://postgis.net/docs/manual-3.0/ST_3DDistance.html