[QGIS-Developer] Any planned/ongoing work regarding datum transformation?

[Even Rouault]

Nyall,

> 
> This is a public callout to QGIS developers/support organisations to
> see whether there's currently any work underway, or planned to
> commence shortly, regarding any aspect of datum transformation within
> QGIS.
> 
> Specifically,
> - is anyone planning on continuing the work begun in 3.0 for extending
> the support for datum transform context handling within QGIS to ensure
> that more areas of code correctly respect user-set datum transform
> settings?
> - is anyone planning on upgrading QGIS to utilise the newer proj v5 api?

I'd suggest defering any substantial QGIS work on that topic to the PROJ 6 
release (temptative release date February 2019) where my current work will 
land (and it is likely that there will be adaptations needed when integrating 
GDAL 2.4 that will rely on PROJ 6). It will likely obsolete a lot of existing 
concepts regarding CRS transforms, and in particular the notion of a +towgs84 
pivot (it will still be available of course). For example, in the "datum 
transformation", instead of having a Source transform and Destination 
tranform, you could have a single Transform field (actually you can already do 
this with PROJ 5). And you will be able to select more existing 
transformations from the PROJ database, taking into account area of interests.

Even

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