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 <[email protected]> On Behalf Of Andrea Giudiceandrea via QGIS-User Sent: 08 August 2025 00:05 To: [email protected] 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 _______________________________________________ QGIS-User mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient you must not use, disclose, copy or distribute this email or any of its attachments and should notify the sender immediately and delete this email from your system. UK Research and Innovation (UKRI) has taken every reasonable precaution to minimise risk of this email or any attachments containing viruses or malware but the recipient should carry out its own virus and malware checks before opening the attachments. UKRI does not accept any liability for any losses or damages which the recipient may sustain due to presence of any viruses. _______________________________________________ QGIS-User mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
