On Wed, 10 Feb 2021 at 00:20, Dave Marshall <43carn...@gmail.com> wrote: > > Nyall, > > The first error which appears is "WARNING: Datum > <Unknown_based_on_Airy_1830_ellipsoid> not recognised by GRASS and no > parameters found ".I think all subsequent errors stem from this. This error > message occurs whether I choose a CRS transformation or not.
Ok - that's an error coming straight from GRASS itself. You'll need to ask the GRASS project about this one and raise a ticket on their issue tracker! Nyall > > Cheers, > > Dave > > On Tue, 9 Feb 2021 at 02:05, Nyall Dawson <nyall.daw...@gmail.com> wrote: >> >> On Tue, 9 Feb 2021 at 05:57, Dave Marshall <43carn...@gmail.com> wrote: >> > >> > Hello, >> > >> > I use QGIS 3.4 to visualise LIDAR tiles from the UK which use EPSG:27700 >> > as the CRS. I put height contours on the images using the r.contour >> > feature in GRASS. This works extremely well. I have tried a couple of >> > times to move to a more up-to-date version of QGIS but in each case, the >> > version of r.contour associated with later versions does not work. These >> > later versions seem to require some sort of co-ordinate transformation on >> > opening the LIDAR files (I think to EPSG:4326) and I wonder if this is >> > part of the problem. Running r.contour generates an error message which >> > seems to suggest it does not recognise or cannot work with the CRS being >> > used (there is a reference to Airy Spheroid). >> >> What's the error? >> >> Nyall >> >> >> >> > >> > What I would like to do is to be able to use a more up-to-date version of >> > QGIS but with the same version of GRASS which I get when I use 3.4. This >> > version would seem to be 7.6.1 rather than 7.8.5. >> > >> > There is a similar contour feature in QGIS under \Raster\Extraction but >> > this does not allow the specification of height ranges which is essential >> > for the work I am doing to avoid the routine from taking a very long time >> > to run. >> > >> > Any help or advice would be much appreciated, >> > >> > Dave Marshall >> > _______________________________________________ >> > Qgis-user mailing list >> > Qgis-user@lists.osgeo.org >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
