[Qgis-user] CRS / reprojection problems
Hi QGISers, I'm having an issue with reprojecting things in QGIS. Installer OSGEO64W Latest version and LTS both have same issue. Issue: reprojection just isn't working. If I load a data set with decimal degrees and another with a projected coordinate system the data (points / lines / polygons) will only display if the basemap is in the same projection system. This is happening across 2 PCs, (windows10) and the LTS and latest versions of QGIS. Has anyone got some troubleshooting tips? Thanks Matt ___ 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] CRS / reprojection problems
Haven't had any problems with any of the versions. I would dare to guess that the problem lies on the data. Can you please share some sample data? A ter, 21/05/2019, 02:53, Matt Boyd escreveu: > Hi QGISers, > I'm having an issue with reprojecting things in QGIS. > Installer OSGEO64W > Latest version and LTS both have same issue. > > Issue: > reprojection just isn't working. If I load a data set with decimal degrees > and another with a projected coordinate system the data (points / lines / > polygons) will only display if the basemap is in the same projection system. > > This is happening across 2 PCs, (windows10) and the LTS and latest > versions of QGIS. Has anyone got some troubleshooting tips? > > Thanks > Matt > ___ > 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] CRS / reprojection problems
Hi, 99 % of the time, the data is the problem because it’s in the wrong crs. Right click on the problem layer in the layer panel and change the layer crs to what is should be. Use a google or other base map from quickmap plugin. That should permit you to find the correct CRS. Sometimes, crs will have problems reprojecting across some latitudes or longitude (like projections make for the poles). In that case, reprojecting the data using the “save as” option will solve the problem. Nicolas > Le 20 mai 2019 à 21:53, Matt Boyd a écrit : > > Hi QGISers, > I'm having an issue with reprojecting things in QGIS. > Installer OSGEO64W > Latest version and LTS both have same issue. > > Issue: > reprojection just isn't working. If I load a data set with decimal degrees > and another with a projected coordinate system the data (points / lines / > polygons) will only display if the basemap is in the same projection system. > > This is happening across 2 PCs, (windows10) and the LTS and latest versions > of QGIS. Has anyone got some troubleshooting tips? > > Thanks > Matt > ___ > 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] CRS / reprojection problems
Hi Nicolas and Alexandre, I'm pretty sure that I've done as much as I can to make sure I haven't screwed up the projections. I used to make those mistakes years ago when I was first learning, lately the mistakes I've made are because I haven't been paying attention... I'm pretty sure I'm paying attention this time. This is a link to some data and a qgis file I'm using as an example https://unimelbcloud-my.sharepoint.com/:f:/g/personal/boydmc_student_unimelb_edu_au/EuUzfUvxA6NGmZOuYo8_fmkB0AvLldzBmXwq68mdwZvmcw?e=Ake4Qi lineations_MGA54_projected is the shapefile with the correctly projected information layer. - Known good data If I change to a geogrpahic / unprojected coordinate system, for example GDA94, this layer is not displayed and the canvas is blank. If I export the lineations_MGA54_projected data to a new file as unprojected GDA94 option, the re-projected data is wrong. Thanks for your help Matt On Tue, May 21, 2019 at 11:37 PM Nicolas Cadieux < nicolas.cadi...@archeotec.ca> wrote: > Hi, > > 99 % of the time, the data is the problem because it’s in the wrong crs. > Right click on the problem layer in the layer panel and change the layer > crs to what is should be. Use a google or other base map from quickmap > plugin. That should permit you to find the correct CRS. > > Sometimes, crs will have problems reprojecting across some latitudes or > longitude (like projections make for the poles). In that case, > reprojecting the data using the “save as” option will solve the problem. > > Nicolas > > > Le 20 mai 2019 à 21:53, Matt Boyd a écrit : > > > > Hi QGISers, > > I'm having an issue with reprojecting things in QGIS. > > Installer OSGEO64W > > Latest version and LTS both have same issue. > > > > Issue: > > reprojection just isn't working. If I load a data set with decimal > degrees and another with a projected coordinate system the data (points / > lines / polygons) will only display if the basemap is in the same > projection system. > > > > This is happening across 2 PCs, (windows10) and the LTS and latest > versions of QGIS. Has anyone got some troubleshooting tips? > > > > Thanks > > Matt > > ___ > > 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] CRS / reprojection problems
Hi, Right clicking on the layer in the layer panel and changing the projection to the correct one should then fix the problem. Tell me if it’s still a problem and I will also look at the data. Nicolas > Le 22 mai 2019 à 03:34, a > écrit : > > Sorry to have to disagree with you, but there is something wrong with your > data. If I load the "lineations_GDA94" it claims to be a projected data, and > the units are clearly meters (numbers like -42854769,3100060 in the > coordinate readout). But if you check, you'd find that QGIS thinks the units > are degrees: > > > > Treating the meter cooridnates as degrees works as long as no reprojection is > needed, but will mess up things when combining it with other data... > > > -- > Barend Köbben > > > On 22/05/2019, 05:54, "Qgis-user on behalf of Matt Boyd" > wrote: > > Hi Nicolas and Alexandre, > I'm pretty sure that I've done as much as I can to make sure I haven't > screwed up the projections. I used to make those mistakes years ago when I > was first learning, lately the mistakes I've made are because I haven't been > paying attention... I'm pretty sure I'm paying attention this time. > > This is a link to some data and a qgis file I'm using as an example > https://unimelbcloud-my.sharepoint.com/:f:/g/personal/boydmc_student_unimelb_edu_au/EuUzfUvxA6NGmZOuYo8_fmkB0AvLldzBmXwq68mdwZvmcw?e=Ake4Qi > > lineations_MGA54_projected is the shapefile with the correctly projected > information layer. - Known good data > > If I change to a geogrpahic / unprojected coordinate system, for example > GDA94, this layer is not displayed and the canvas is blank. > > If I export the lineations_MGA54_projected data to a new file as unprojected > GDA94 option, the re-projected data is wrong. > > Thanks for your help > > Matt > > > > > > > On Tue, May 21, 2019 at 11:37 PM Nicolas Cadieux > wrote: > Hi, > > 99 % of the time, the data is the problem because it’s in the wrong crs. > Right click on the problem layer in the layer panel and change the layer crs > to what is should be. Use a google or other base map from quickmap plugin. > That should permit you to find the correct CRS. > > Sometimes, crs will have problems reprojecting across some latitudes or > longitude (like projections make for the poles). In that case, reprojecting > the data using the “save as” option will solve the problem. > > Nicolas > > > Le 20 mai 2019 à 21:53, Matt Boyd a écrit : > > > > Hi QGISers, > > I'm having an issue with reprojecting things in QGIS. > > Installer OSGEO64W > > Latest version and LTS both have same issue. > > > > Issue: > > reprojection just isn't working. If I load a data set with decimal degrees > > and another with a projected coordinate system the data (points / lines / > > polygons) will only display if the basemap is in the same projection system. > > > > This is happening across 2 PCs, (windows10) and the LTS and latest versions > > of QGIS. Has anyone got some troubleshooting tips? > > > > Thanks > > Matt > > ___ > > 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] CRS / reprojection problems
Kosza replied to me and suggested I try epsg 4283 instead of epsg 4938 Is it usual to have 2 CRS with the same name, one of which appears to be projected and the other not, I don't think I've seen this before. There still seems to be something odd about 4938, but I don't see any reason to use it so it shouldn't bother me. Here's where I can learn something. Does anyone know what the deal with this is? I can see a need for a different projections, but is there supposed to be a better way of naming it that I didn't pick up on, am I going to need to remember epsg codes form now on? Thanks Matt On Wed, May 22, 2019 at 11:51 PM Nicolas Cadieux < nicolas.cadi...@archeotec.ca> wrote: > Hi, > Right clicking on the layer in the layer panel and changing the projection > to the correct one should then fix the problem. Tell me if it’s still a > problem and I will also look at the data. > Nicolas > > Le 22 mai 2019 à 03:34, a > écrit : > > Sorry to have to disagree with you, but there is something wrong with your > data. If I load the "lineations_GDA94" it claims to be a projected data, > and the units are clearly meters (numbers like -42854769,3100060 in the > coordinate readout). But if you check, you'd find that QGIS thinks the > units are degrees: > > > > > > > > Treating the meter cooridnates as degrees works as long as no reprojection > is needed, but will mess up things when combining it with other data... > > > > > > -- > > Barend Köbben > > > > > > On 22/05/2019, 05:54, "Qgis-user on behalf of Matt Boyd" < > qgis-user-boun...@lists.osgeo.org on behalf of mattsli...@gmail.com> > wrote: > > > > Hi Nicolas and Alexandre, > > I'm pretty sure that I've done as much as I can to make sure I haven't > screwed up the projections. I used to make those mistakes years ago when I > was first learning, lately the mistakes I've made are because I haven't > been paying attention... I'm pretty sure I'm paying attention this time. > > > > This is a link to some data and a qgis file I'm using as an example > > > https://unimelbcloud-my.sharepoint.com/:f:/g/personal/boydmc_student_unimelb_edu_au/EuUzfUvxA6NGmZOuYo8_fmkB0AvLldzBmXwq68mdwZvmcw?e=Ake4Qi > > > > lineations_MGA54_projected is the shapefile with the correctly projected > information layer. - Known good data > > > > If I change to a geogrpahic / unprojected coordinate system, for example > GDA94, this layer is not displayed and the canvas is blank. > > > > If I export the lineations_MGA54_projected data to a new file as > unprojected GDA94 option, the re-projected data is wrong. > > > > Thanks for your help > > > > Matt > > > > > > > > > > > > > > On Tue, May 21, 2019 at 11:37 PM Nicolas Cadieux < > nicolas.cadi...@archeotec.ca> wrote: > > Hi, > > 99 % of the time, the data is the problem because it’s in the wrong crs. > Right click on the problem layer in the layer panel and change the layer > crs to what is should be. Use a google or other base map from quickmap > plugin. That should permit you to find the correct CRS. > > Sometimes, crs will have problems reprojecting across some latitudes or > longitude (like projections make for the poles). In that case, > reprojecting the data using the “save as” option will solve the problem. > > Nicolas > > > Le 20 mai 2019 à 21:53, Matt Boyd a écrit : > > > > Hi QGISers, > > I'm having an issue with reprojecting things in QGIS. > > Installer OSGEO64W > > Latest version and LTS both have same issue. > > > > Issue: > > reprojection just isn't working. If I load a data set with decimal > degrees and another with a projected coordinate system the data (points / > lines / polygons) will only display if the basemap is in the same > projection system. > > > > This is happening across 2 PCs, (windows10) and the LTS and latest > versions of QGIS. Has anyone got some troubleshooting tips? > > > > Thanks > > Matt > > ___ > > 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] CRS / reprojection problems
Sorry, I didn't describe the resolution in my email, just complained quietly about something. Somehow I'd loaded up epsg 4938, which is described as GDA94. I assumed that was the geographic projection and it wasn't until later that I looked at https://epsg.io/4938 and saw that it's got some odd projection going on. I could see the meters in the projection but couldn't get past that I'd selected GDA94. Now I dig into it a little more I can see that there's this whole set of CRS under geocentric projections. I've either forgotten about these or never knew. The projection I meant to use was epsg 4283 GDA94 https://epsg.io/4283 . Somehow in my project settings the default GDA94 projection which I've always used had been superseded by the geocentric GDA94 and I didn't notice. Thanks QGIS people. Matt On Thu, May 23, 2019 at 9:56 AM Matt Boyd wrote: > Kosza replied to me and suggested I try epsg 4283 instead of epsg 4938 > > Is it usual to have 2 CRS with the same name, one of which appears to be > projected and the other not, I don't think I've seen this before. There > still seems to be something odd about 4938, but I don't see any reason to > use it so it shouldn't bother me. > > Here's where I can learn something. Does anyone know what the deal with > this is? I can see a need for a different projections, but is there > supposed to be a better way of naming it that I didn't pick up on, am I > going to need to remember epsg codes form now on? > > Thanks > Matt > > On Wed, May 22, 2019 at 11:51 PM Nicolas Cadieux < > nicolas.cadi...@archeotec.ca> wrote: > >> Hi, >> Right clicking on the layer in the layer panel and changing the >> projection to the correct one should then fix the problem. Tell me if it’s >> still a problem and I will also look at the data. >> Nicolas >> >> Le 22 mai 2019 à 03:34, >> a écrit : >> >> Sorry to have to disagree with you, but there is something wrong with >> your data. If I load the "lineations_GDA94" it claims to be a projected >> data, and the units are clearly meters (numbers like -42854769,3100060 in >> the coordinate readout). But if you check, you'd find that QGIS thinks the >> units are degrees: >> >> >> >> >> >> >> >> Treating the meter cooridnates as degrees works as long as no >> reprojection is needed, but will mess up things when combining it with >> other data... >> >> >> >> >> >> -- >> >> Barend Köbben >> >> >> >> >> >> On 22/05/2019, 05:54, "Qgis-user on behalf of Matt Boyd" < >> qgis-user-boun...@lists.osgeo.org on behalf of mattsli...@gmail.com> >> wrote: >> >> >> >> Hi Nicolas and Alexandre, >> >> I'm pretty sure that I've done as much as I can to make sure I haven't >> screwed up the projections. I used to make those mistakes years ago when I >> was first learning, lately the mistakes I've made are because I haven't >> been paying attention... I'm pretty sure I'm paying attention this time. >> >> >> >> This is a link to some data and a qgis file I'm using as an example >> >> >> https://unimelbcloud-my.sharepoint.com/:f:/g/personal/boydmc_student_unimelb_edu_au/EuUzfUvxA6NGmZOuYo8_fmkB0AvLldzBmXwq68mdwZvmcw?e=Ake4Qi >> >> >> >> lineations_MGA54_projected is the shapefile with the correctly projected >> information layer. - Known good data >> >> >> >> If I change to a geogrpahic / unprojected coordinate system, for example >> GDA94, this layer is not displayed and the canvas is blank. >> >> >> >> If I export the lineations_MGA54_projected data to a new file as >> unprojected GDA94 option, the re-projected data is wrong. >> >> >> >> Thanks for your help >> >> >> >> Matt >> >> >> >> >> >> >> >> >> >> >> >> >> >> On Tue, May 21, 2019 at 11:37 PM Nicolas Cadieux < >> nicolas.cadi...@archeotec.ca> wrote: >> >> Hi, >> >> 99 % of the time, the data is the problem because it’s in the wrong crs. >> Right click on the problem layer in the layer panel and change the layer >> crs to what is should be. Use a google or other base map from quickmap >> plugin. That should permit you to find the correct CRS. >> >> Sometimes, crs will have problems reprojecting across some latitudes or >> longitude (like projections make for the poles). In that case, >> reprojecting the data using the “save as” option will solve the problem. >> >> Nicolas >> >> > Le 20 mai 2019 à 21:53, Matt Boyd a écrit : >> > >> > Hi QGISers, >> > I'm having an issue with reprojecting things in QGIS. >> > Installer OSGEO64W >> > Latest version and LTS both have same issue. >> > >> > Issue: >> > reprojection just isn't working. If I load a data set with decimal >> degrees and another with a projected coordinate system the data (points / >> lines / polygons) will only display if the basemap is in the same >> projection system. >> > >> > This is happening across 2 PCs, (windows10) and the LTS and latest >> versions of QGIS. Has anyone got some troubleshooting tips? >> > >> > Thanks >> > Matt >> > ___ >> > Qgis-user mailing list >> > Qgis-user@lists.osgeo.org
