On 3/21/2013 5:06 PM, Stephen Woodbridge wrote:
Francois,
Can you dump the polygons in the multiplyogon and create separate
records for them. So in you example graphic, you would end up with two
separate polygons the touch at a point. I think this would be OK for qgis.
This might be helpful:
http://www.bostongis.com/postgis_dump.snippet
http://postgis.17.n6.nabble.com/converting-multipolygon-to-polygon-td3530291.html
-Steve W
On 3/21/2013 4:57 PM, Francois Hugues wrote:
Hello,
I have to deal with a dataset with a lot of errors. I ran a
st_makevalid which seems to give me good results (all polygons then
appear to be valid, closed and simple). But, when I open this table
as a layer in qgis it still throws me a lot of errors. The image
attached to this message provide you with an example and the error
said : Le segment 0 de l'anneau 16 du polygone 6 est intersecté au
segment 0 de l'anneau 1 du polygone 7 à 933828.8196, 6261164.472 (in
english this may be something like : line 0 of ring 16 is intersected
by line 0 of ring 1 of polygon 7 at point...).
As the rings of the multipolygon share one point, I tried to dump it
and then to union the rings to build a single polygon but I got a
multipolygon back and still an error.
The dataset have a lot of "bow ties" and it seems that st_makevalid
change them to multipolygon but that do not correct all errors in
qgis.
Does anyone have an idea to find any solution ?
Hugues
--
Hugues FRANÇOIS
[email protected]
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