On Tue, 9 Feb 2021 at 05:57, Dave Marshall <[email protected]> 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 > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ 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
