PROj might have changed and your file projection is unsupported anymore. Transfer your layer to something less specific.
Alex Le lun. 8 févr. 2021 à 14:57, Dave Marshall <[email protected]> a écrit : > 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 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 >
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