[Qgis-user] [QGIS-Developer] lack of conflation tools

[Vincent Picavet]

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
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> Direction des Systèmes d’Information et du Développement Numérique
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