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3D centroid in PostGIS
How could I find the 3D centroid of this feature in PostGIS:
SELECT
ST_AsText(
ST_GeomFromText('POLYGON Z ((0 0 0, 1 0 0, 1 0 1, 1 1 1, 0 1 1, 0 0 1, 0 0 0 ))')
) geom;
...