On Sat, Dec 15, 2012 at 11:39:05PM -0500, Mathieu Basille wrote:

> there shouldn't be a parameter of tolerance in ST_Union to make this
> more transparent and flexible to the user?

Indeed. There should !
But there's none as of today.
See the wiki for some ideas/plans and feel free to contribute
to the discussion
http://trac.osgeo.org/postgis/wiki/ToleranceDiscussion

--strk;
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