I am trying to join some polygons using ST_Union but I am facing some problems due to slightly shifted coordinates of the polygons.
The problem is that the lower point does not have the same longitude in the two polygons, in the first polygon it's 8.54190284185528, in the second one it's 8.54190284185522.
Due to this marginal difference St_Union returns a MultiPolygon instead of a Polygon.
Any ideas on how to fix that?
Something like the st_exteriorring (which doesn't work with MultiPolygons)?
St_ConcaveHull does not work due to some quite complicated polygons.