Hi Denis,
In your example, I don't understand how the parts of your
multipolygons can be adjacent. Are they valid ?
Do you have a visual example ?
Thank you
Nicolas
On 21 November 2013 07:32, Denis Rouzaud denis.rouz...@gmail.com wrote:
Hello Rémi,
I was hoping a simplest request without
Thanks for the explanation.
You could correct the multipolygons in one step, by using the
st_buildArea function, that merges a linework of linestrings,
preserving holes.
To extract polygons boundaries as linestring, st_boundary() is very handy:
The bad_multipg table contains invalid
wow, thanks a lot!
indeed, much much nicer!
thanks again,
Denis
On 21. 11. 13 15:47, Nicolas Ribot wrote:
Thanks for the explanation.
You could correct the multipolygons in one step, by using the
st_buildArea function, that merges a linework of linestrings,
preserving holes.
To extract
Hi Nicolas,
I edit my multi polygons in QGIS, and you're right the geometry becomes
invalid if some parts have adjacent segments.
In a simple case, I would have a multi polygons with 3 parts with 2
parts adjacent.
http://imgur.com/zvxPFeR
Although the geometry is invalid, my intention is
You welcome.
In fact, thanks to you: I used to extract multipolygons boundaries
with such queries (!!):
st_exteriorRing((st_dumpRings(
(st_dump(geom)).geom
)).geom) as geom
until your use case makes me remember st_boundary function :)
Nicolas
On 21 November 2013 15:51,
Hi all,
I am drawing some multipolygons in QGIS and sometimes, I have parts of
them which are adjacent and I'd like to homogenize them to have less
parts and no adjacent parts.
I could do this with a quite complex method:
1. get the number of parts Z:
SELECT ST_NumGeometries(geometry)
From what I understand of your needs, Postigs topology was designed for
this.
Cheers,
Rémi-C
2013/11/20 Denis Rouzaud denis.rouz...@gmail.com
Hi all,
I am drawing some multipolygons in QGIS and sometimes, I have parts of
them which are adjacent and I'd like to homogenize them to have less
Hello Rémi,
I was hoping a simplest request without enabling topology but thanks anyway!
Cheers,
Denis
On 20. 11. 13 18:26, Rémi Cura wrote:
From what I understand of your needs, Postigs topology was designed
for this.
Cheers,
Rémi-C
2013/11/20 Denis Rouzaud denis.rouz...@gmail.com
