Bonjour Alain,
I read the document and it's useful. IMHO, this should be included in
the QGIS documentation in the future. Under QGIS 3.6.2, I used the
plugin but I had to fix one problem at a time because of stability
issues. I did not make a bug report because one was already active. I
may be able to give you access to my shape file if you are interested in
trouble shooting. I would need to ask first because I do not own this
database but I am confident I could obtain permission. Send me a
private email if you need more info.
Bonne journée!
Nicolas Cadieux
On 2019-05-24 3:20 a.m., FERRATON Alain (Chef de groupe) -
SG/SPSSI/CPII/DOO/ET wrote:
Hi,
We published a document in early 2018 on geometry fixes.
This document should be revised, but may provide some elements.
(For example, geometry checker is now more stable under QGIS 3)
It is open for comments...
We have in our projects to produce a more user-friendly version
see :
http://geoinformations.metier.e2.rie.gouv.fr/spip.php?page=article&id_article=3522&id_rubrique=712
see the document at the bottom of the page
Regards,
Alain
FERRATON Alain
Ministère de la Transition écologique et solidaire (MTES)
SG/SPSSI/CPII/DOO
Chef du groupe Expertise Technique
02.40.12.84.08
Le 23/05/2019 à 13:07, > Richard McDonnell (par Internet, dépôt
qgis-user-boun...@lists.osgeo.org) a écrit :
Hi Finbar,
One other solution would be to use a double buffer, as in a positive
buffer something like 0.001, followed by a negative buffer of -0.001.
The issue you are facing is common, as most flood polygons are
derived from raster's and you can get a lot of self-intersections.
The double buffer is in my experience the handiest method of solving
the issue. Also by using such a small buffer, even a single buffer,
will make little difference, to a house being in or out of a flood
zone, when taking into account the, resolutions of the polygon datasets.
Hope this helps,
Regards,
Richard.
--
Richard McDonnell
GIS Specialist | FRM Data Management
Email: richard.mcdonn...@opw.ie
Phone: + 353 (0) 1 647 6543
Mobile: +353 (0) 87 688 5964
The Office of Public Works
52 St. Stephen's Green
Dublin 2 ~ D02 DR67
-----Original Message-----
From: Qgis-user <qgis-user-boun...@lists.osgeo.org> On Behalf Of
GILLEN Finbar
Sent: 22 May 2019 11:40
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Fix Geometries
Thanks for all the responses on this... I am going to try the Check
Validity plugin ('QGIS' method) as a starter within QGIS 3.2. I am
using a fairly detailed flood polygon so accuracy is key. I will let
you know how I get on.
Thanks again,
Finbar
-----Original Message-----
From: Qgis-user <qgis-user-boun...@lists.osgeo.org> On Behalf Of
Nicolas Cadieux
Sent: 21 May 2019 23:02
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Fix Geometries
Hi,
The Geometry Checker plugin will add a the 'Check Geometries' option
in the vector menu. It is very unstable with the current version of
QGIS. If you get it to run, it should solve most problems. I get it
to run when I only select one test at a time.
The most predictable tool is the vector/geometry tools/Check validity
using the 'QGIS' Method (not GEOS). That should fix your file.
There is a 'remove duplicate vertices' and 'delete duplicate
geometries' in processing. Your problem could also be caused by a
module not working with multipart objects. Go to vector/Geometry
tools/Multiparts to singleparts.
If your lines don't touch, try the 'snap Geometries to layer ' in
processing.
Nicolas
On 2019-05-21 2:54 a.m., Mithoefer wrote:
Hi Finnbar,
What plugin are you talking about and what QGIS version do you use?
You have a number of tools to check geometries. Try "Topology checker"
or "Geometry checker" to see where the problems are (invalid
geometries). Geometry checker is also able to fix some issues. Maybe
thats the one you use.
Anotehr option is GRASS GIS. Have you ever worked wit GRASS GIS? You
can create a GRASS database and import your polygons. GRASS GIS uses a
topolgical data model and is quite powerful in establishing a desent
data model with snapping options and clean functions. You can also try
GRASS tools from the processing framework like build polygons or clean.
Regards
Klaus
Am 20.05.19 um 11:31 schrieb GILLEN Finbar:
Hi All,
I have a few polygon layers where anytime I go to use them I have to
use the fix geometries plugin so that invalid geometries are fixed.
When I save the output from the fixed geometries plugin and add it in
a new project the same issues appears where I can’t use it accurately
to do a Select or Join by Location because some of the geometries are
still seen as invalid even though they have been ‘fixed’.
Is there anyway solution to this or do I have to keep using the fix
geometries plugin anytime I use the polygons for analysis?
Regards
Finbar
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