[Qgis-user] How do you see which transform is being used for a given projection?

[John Stevenson - BGS]

Thanks Andrea,

I found the information in in Project -> Properties -> Transformations, as you suggested.

(I didn't know that tab existed and had been looking in Project -> Properties -> CRS)

Regards,
John

-----Original Message-----
From: QGIS-User <qgis-user-bounces at lists.osgeo.org> On Behalf Of Andrea Giudiceandrea via QGIS-User
Sent: 08 August 2025 00:05
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] How do you see which transform is being used for a given projection?

> John Stevenson - BGS jostev at bgs.ac.uk Thu Aug 7 05:02:32 PDT 2025

> When I add a layer with OSGB36 (epsg:27700) projection to a project in QGS84 (epsg:4326), I am given an option to select the coordinate transformation to use.  There are multiple options: https://epsg.io/27700.  The best includes a custom correction grid, OSTN15_NTv2.
>
> Once the layer has been added, is there a way to see which transformation was used?

Hi John,
you should find chosen datum transformation in "Settings -> Options -> CRS and Transforms -> Coordinate Transforms" and /or "Project -> Properties -> Transformations".

Please see:

-
https://docs.qgis.org/latest/en/docs/user_manual/introduction/qgis_configuration.html#transformations-properties

-
https://docs.qgis.org/latest/en/docs/user_manual/introduction/qgis_configuration.html#transformations-options

-
https://docs.qgis.org/latest/en/docs/user_manual/working_with_projections/working_with_projections.html#datum-transformations


Regards.

Andrea
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