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

[Nyall Dawson]

On Mon, 5 Nov 2018 at 19:13, Even Rouault <even.rouault at spatialys.com> wrote:
>
> 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.

Perfect -- thanks for the heads up, this is exactly the kind of
feedback I was looking for.

Nyall