Thanks to Greg amd Saber.
On Mon, 4 May 2026, Saber Razmjooei wrote: > Hi Jim, > > Here is a full article on how projections (specifically the British > National Grid) work in QGIS and what you can do to improve your data > collection when using on-the-fly transformation: > https://merginmaps.com/docs/gis/projections/#projections > > Kind regards > Saber > > > On Fri, 1 May 2026 at 19:36, Jim Jackson via QGIS-User < > [email protected]> wrote: > > > > > > > QGIS version 3.40.6-Bratislava > > QGIS code branch Release 3.40 > > OS Linux Devuan GNU/Linux 6 (excalibur) (basically Debian Trixie) > > > > Hi All, > > > > As a member of a community Archaeology Group, I'm using QGIS for recording > > archaeological features in the UK. I'm using Google Satellite, > > OpenStreetMap and National Library of Scotland historic basemaps, which > > (as > > I understand it) use EPSG:3857. > > > > I have an RTK GPS receiver for collecting data points which are in > > EPSG:4326. > > I > > also get UK National Grid data points from a colleague who has access to a > > total station. > > > > As I think I understand it, I need to set the project CRS to UK national > > grid EPSG:27700 to get sensible distance measurements However I then get > > occasional warnings "Used a ballpark transform from EPSG:27700 to > > EPSG:3857" indicated less than accurate transformations, and then I get > > lost!!!! > > > > Can anyone point me to a tutorial on how to set up QGIS in the UK to get > > accurate transformations in these circumstances (which can't be that > > unusual). > > > > Any advice and/or pointers where I've gone wrong gratefully received. > > > > Jim Jackson > > > > > > _______________________________________________ > > 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 > > > > > -- > > Saber Razmjooei > > Co-Founder > > lutraconsulting.co.uk > > [image: https://www.linkedin.com/in/saber-razmjooei/] > <https://www.linkedin.com/in/saber-razmjooei/> > <https://www.youtube.com/@LutraConsulting> > <https://github.com/lutraconsulting> > > <https://www.lutraconsulting.co.uk/> > _______________________________________________ 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
