[PROJ] [EXTERNAL] Re: Proj 6 API questions

[Even Rouault]

> Well - as soon as I'm done porting QGIS to proj6, it will be possible
> for users to create projects using these ESRI:xxxx ellipsoid codes.
> Could they be deprecated instead of removed? That would avoid any
> possible regression for users.

OK, we'll keep them then.

<cultural_question>
I'm interested to know why in QGIS an ellipsoid code is directly manipulated, 
or stored. I would have though QGIS would only manipulate higher level objects 
like CRS, and perhaps query their ellipsoid parameters for some computations. 
This is what I wondered while reviewing https://github.com/qgis/QGIS/pull/9557 
with QgsEllipsoidUtils offering API starting with an ellipsoid name.
</cultural_question>

> 
> Nyall
> 
> > - do not touch the ESRI definitions, and add IAU next to it
> > - (more involved, would require database schema change, and likely
> > software
> > logic too to make something useful of it). Import IAU, and create a link
> > from ESRI definitions to IAU ones (when identical/compatible)
> > 
> > Even
> > 
> > --
> > Spatialys - Geospatial professional services
> > http://www.spatialys.com


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