[QGIS-Developer] How to get a generated CRS from an Unknown CRS

[Nyall Dawson]

On Wed, 7 Oct 2020 at 17:16, René-Luc Dhont <rldhont at gmail.com> wrote:
>
> Hi devs,
>
> We are facing a behavior we did not expect from QGIS Server regarding
> custom projections.
>
> We are using Raster layer with a custom projection. This projection is
> well read and understanding by QGIS. The data are displayed at the right
> place with 'on-th-fly' CRS transformation. But the CRS is desribed by
> QGIS as an Unknown CRS and not as a Generated CRS.
> In the XML project, the CRS is described with proj4 text and WKT but it
> does not have an authid with a USER authority.
>
> And with QGIS Desktop and QGIS Server on Linux OS, sometimes the layer
> is loaded without any CRS. The layer properties dialog displayed an
> 'invalid projection', even if the CRS is defined in the project and the
> layer has been well displyed before saving, closing and opening the project.
>
> Here are my questions :
> Is the auto generated CRS has been deactivated from QGIS ?
> Is there a way to create a custom CRS from a layer CRS defined as
> unknown CRS ?

This has been fixed recently for 3.16.

It's basically just a string issue -- instead of reading "Unknown CRS"
the text should be "Custom CRS". The CRS will still transform
correctly (as you've deduced).

Nyall

>
> Regards,
> René-Luc
>
> _______________________________________________
> 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