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Try to use function st_cleanpolygon
or st_buffer with a radius of 0.0.
Regards
Bo Victor Thomsen
Aestas-GIS
Denmark
Den 25-10-2012 18:54, Alexandre Neto skrev:
I'm trying to Aggregate\Dissolve a set of adjacent,
but not touching polygons in Postgis. The geometries were created
editing the Postgis table in QGIS created, with snapping and avoid
overlap in the layer.
I used ST_Union like this:
SELECT ST_Union(the_geom)
FROM table;
Small gaps similar to lines appear in the result. This
happens when the adjacent polygons do not share the exact
same vertices.
Is there a way to eliminate this "gaps" or "small
angles" within Postgis?
I know that v.clean in GRASS can eliminate small
angles, and correct topology, but that would mean I needed
to copy the features to GRASS, correct them and copy it
back to Postgis.
Thanks in advance,
Alexandre Neto
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