Forgot to say: QGIS 1.7 trunk. I also tried a union of the polygon and an adjacent one directly in postgis. Invalid geometry.
On Mar 29, 2011, at 8:55 AM, William Kyngesburye wrote: > I'm a bit stumped on this. I have some polygons in a postgis layer with > spikes into the interior. The spikes are an exact retrace going into and > back out (the digitizers never completed the line to another edge of the > polygon to split it into 2 polygons). The node edit tool shows many, but not > always all, nodes along the spike with problems, I think it depends on how > many other node errors are on other parts of the polygon. They exist in the > layer fine, but I can't do any geometry operations like merge or split > (nothing happens), though I can move/add/delete vertices. I need to extend > the "spike" to split the polygon. > > <Screen shot 2011-03-29 at 8.39.21 AM.png><Screen shot 2011-03-29 at 8.52.53 > AM.png> > > I tried exporting to a line shapefile (Vector->Polygons to Lines), where a > split will will work to separate the spike from the outer ring, then I extend > the line and eventually create 2 polygons, which I can copy-n-paste back to > the original polygon layer, but I ran into invalid geometry types: > > http://trac.osgeo.org/qgis/ticket/3604 > > Any other ideas? I don't want to retrace the whole spike, as some are very > long. Or is this a bug in handling invalid geometry? > > ----- > William Kyngesburye <kyngchaos*at*kyngchaos*dot*com> > http://www.kyngchaos.com/ > > All generalizations are dangerous, even this one. > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user ----- William Kyngesburye <kyngchaos*at*kyngchaos*dot*com> http://www.kyngchaos.com/ "I ache, therefore I am. Or in my case - I am, therefore I ache." - Marvin _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
