[QGIS-Developer] lack of conflation tools

Vincent Picavet vincent.ml at oslandia.com
Fri May 31 02:22:20 PDT 2024


Hi,

Geospatial data conflation is not an easy task, and usually depends on :

- the input data

- desired output

- semantics

- conflation based mainly on semantics( / attribute data ), topology or purely geometric

Note that semantic and topology-based methods are much more robusts than geometry-based ones.

In any case, there is no magic workflow and the method has to be adapted to the specific context.

I contributed to an implementation based on PostGIS quite a long time ago :

https://docplayer.fr/8718145-Appariement-de-graphes-de-reseau-avec-postgis.html ( in french ).

There could be some generic algorithms which could be made available in QGIS processing to ease creation of workflows for conflation ( e.g. node fingerprints, geometry local correspondance search  ).

Get in touch if you are interested in developing some.

Vincent


On 30/05/2024 11:46, PIERRE Sylvain via QGIS-Developer wrote:
>
> Hi devs and  qgis power users,
>
> After investigating I can arg that there’s a lack of conflation tools in QGIS like such existing for Esri  :
>
> https://proceedings.esri.com/library/userconf/proc17/tech-workshops/tw_513-105.pdf
>
> Is there some plan or something I miss for doing such task in QGIS ?
>
> Thanks
>
> **
>
> 	
>
> Sylvain PIERRE**
>
> Chef de projet système d’information
>
> Direction des Systèmes d’Information et du Développement Numérique
>
> Service Projets et Ingénierie Numérique
>
> *Collectivité européenne d’Alsace*
>
> Tél : 03 88 76 68 88
>
> sylvain.pierre at alsace.eu <mailto:sylvain.pierre at alsace.eu>
>
> www.alsace.eu <http://www.alsace.eu>
>
> facebook <http://www.facebook.com/toutelalsace>twitter <http://www.twitter.com/toutelalsace>insta <http://www.instagram.com/toutelalsace>
>
>
> _______________________________________________
> QGIS-Developer mailing list
> QGIS-Developer at lists.osgeo.org
> List info:https://lists.osgeo.org/mailman/listinfo/qgis-developer
> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-developer
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20240531/c64d5d43/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 8099 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20240531/c64d5d43/attachment-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 827 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20240531/c64d5d43/attachment-0003.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 853 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20240531/c64d5d43/attachment-0004.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 1038 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20240531/c64d5d43/attachment-0005.png>


More information about the QGIS-Developer mailing list