[postgis-users] ESRI union (analysis) in Postgis

Ralf Suhr Ralf.Suhr at itc-halle.de
Thu Jul 8 00:44:15 PDT 2010

Hi Teresa,

you can't get a intersection from more then two polygons at a time. Think 
about the attributes you get. The attributes are from poly1 and or poly2. The 
solution is to use only datasources with non overlaping polygons.


Am Donnerstag 08 Juli 2010, 09:27:06 schrieb Teresa Fazio:
> The solution you propose is valid to get polygons describing
> intersections between two polygons, but I cannot figure out how to
> obtain polygons describing intersections between more than two polygons
> like the central polygon drawn in the shape TEST_Union.
> I repeat that the TEST_Union shapefile was simply obtained using the
> "union (analysis)" tool in ESRI ArcGIS.
> Any other help?
> Thank you.
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