-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Il 10/12/2013 04:49, Luca Morandini ha scritto:
> we noticed that, despite the use of ST_SimplifyPreserveTopology, > non-adjacent polygons may overlap; this happens when there is a > long and narrow water body of between them (think of a fiord), but > this body is not itself a polygon. > > To solve this issue we came up with the idea of adding an > "universe polygon"; that is, a polygon that enclose the entire > extent of a table, so that every polygon has a left and right > polygon: would this do the trick ? Hi Luca, you really need to use full topology for this. ST_SimplifyPreserveTopology simply prevents topological errors, it does not guarantee sharing of nodes etc. Good luck. - -- Paolo Cavallini - www.faunalia.eu QGIS & PostGIS courses: http://www.faunalia.eu/training.html -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) Comment: Using GnuPG with Icedove - http://www.enigmail.net/ iEYEARECAAYFAlKmreQACgkQ/NedwLUzIr538QCePEiOoGaI2eSq9u8JsCviY77X 0bgAn0BrwdhOY0Ua4hnLmIWE/YdkLon3 =UWZJ -----END PGP SIGNATURE----- _______________________________________________ postgis-users mailing list [email protected] http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
