Re: [Qgis-user] GRASS and UK LIDAR
On Wed, 10 Feb 2021 at 00:20, Dave Marshall <43carn...@gmail.com> wrote: > > Nyall, > > The first error which appears is "WARNING: Datum > 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 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
Re: [Qgis-user] GRASS and UK LIDAR
Nyall, The first error which appears is "WARNING: Datum 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. Cheers, Dave On Tue, 9 Feb 2021 at 02:05, Nyall Dawson 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
Re: [Qgis-user] GRASS and UK LIDAR
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
Re: [Qgis-user] GRASS and UK LIDAR
Alex, Many thanks for the quick response. That would explain why I see the message to select a different CRS when I load these files into later versions of QGIS but all the work I do generates UK Ordnance Survey grid references so I have to use the 27700 projection or one that will generate the exact same numbers. Perhaps I just have to live with the old version. Cheers, Dave On Mon, 8 Feb 2021 at 21:36, Alexis R.L. wrote: > 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 <43carn...@gmail.com> 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 >> 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
Re: [Qgis-user] GRASS and UK LIDAR
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 <43carn...@gmail.com> 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 > 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
[Qgis-user] GRASS and UK LIDAR
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 Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
