Re: [Qgis-user] Using custom projections/transformations from a PROJ.4 init-file
> I guess the +proj=pipeline definitions spoil that requirement. I'm not even sure if those work in command-line GDAL. Definitions with +proj=pipeline only work with the development version of PROJ.4 (new version out soon though). There is nothing in the way for a pipeline to be reversible, I'd go so far as to say that in most cases they will be. They should also work with GDAL, although you'd have to know what you are doing to get the expected results. At least as long as GDAL uses the current API (proj_api.h). The same goes for QGIS. The NordicTransformations repository I linked to in the previous mail is my attempt at creating a set of init-files that uses the new features of PROJ.4 while still being compatible with software such as GDAL and QGIS that (for obvious reasons) has not embraced the new API yet. /Kristian -Oprindelig meddelelse- Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Kristian Evers Sendt: 12. januar 2018 16:32 Til: Andre Joost ; qgis-user@lists.osgeo.org Emne: Re: [Qgis-user] Using custom projections/transformations from a PROJ.4 init-file Good suggestion, but that's not it. I have made tests with simpler transformations as well. Things like "+proj=merc +lat_0=56" (in separate init files with no exotic stuff in it) for instance, which is definitely defined both ways. Same result. Also, the test calculation wouldn't work if that was the case. Other suggestions? /Kristian -Oprindelig meddelelse- Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Andre Joost Sendt: 12. januar 2018 16:19 Til: qgis-user@lists.osgeo.org Emne: Re: [Qgis-user] Using custom projections/transformations from a PROJ.4 init-file Am 12.01.2018 um 11:24 schrieb Kristian Evers: > Hi, > > I am trying to define my own "custom projection" by using a PROJ.4 > init-file. The reason I want to do that is that I only want to > maintain the projections/transformations that I need in one place > instead of many. I find the process a bit frustrating since at first > glance it seems to be working, but then when I try to save it and > close the custom projection dialog I am told that the definition is > invalid. As it can be seen on the screenshot below, when I enter the > PROJ.4 parameters - in this case > "+init=C:\dev\NordicTransformations\resources\DK:UTM32N" - the test > works fine but when I try to save it, I am presented with the message > below. Since the test works the problem is not that the file can't be > found - it is something else. > > I experience the same behavior in both QGIS2 and QGIS3. Is this the > intended behavior? Is it by design that I am not able to use > init-files or is this simply a bug? Is there a known workaround? > > [cid:image001.png@01D38B96.E25BF930] > > There is no errors in the projection setup in the init-file, which > the working test transformation proves. The init file in question can > be seen here: > https://github.com/NordicGeodesy/NordicTransformations/blob/master/resources/DK. > I am aware that I can just add the definition of the CRS directly, or > simply use epsg:25832. That is not the point. I have other more > esoteric transformations in the same file that is more complicated to > manage in QGIS itself. > > I appreciate any advice and guidance. If this indeed is a bug I will > gladly help fix it. QGIS (via GDAL) needs a working inverse projection to be defined. Many exotic projections defined in PROJ.4 fail therefore. I guess the +proj=pipeline definitions spoil that requirement. I'm not even sure if those work in command-line GDAL. Greetings, Andre Joost ___ 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 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] Using custom projections/transformations from a PROJ.4 init-file
Good suggestion, but that's not it. I have made tests with simpler transformations as well. Things like "+proj=merc +lat_0=56" (in separate init files with no exotic stuff in it) for instance, which is definitely defined both ways. Same result. Also, the test calculation wouldn't work if that was the case. Other suggestions? /Kristian -Oprindelig meddelelse- Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Andre Joost Sendt: 12. januar 2018 16:19 Til: qgis-user@lists.osgeo.org Emne: Re: [Qgis-user] Using custom projections/transformations from a PROJ.4 init-file Am 12.01.2018 um 11:24 schrieb Kristian Evers: > Hi, > > I am trying to define my own "custom projection" by using a PROJ.4 > init-file. The reason I want to do that is that I only want to > maintain the projections/transformations that I need in one place > instead of many. I find the process a bit frustrating since at first > glance it seems to be working, but then when I try to save it and > close the custom projection dialog I am told that the definition is > invalid. As it can be seen on the screenshot below, when I enter the > PROJ.4 parameters - in this case > "+init=C:\dev\NordicTransformations\resources\DK:UTM32N" - the test > works fine but when I try to save it, I am presented with the message > below. Since the test works the problem is not that the file can't be > found - it is something else. > > I experience the same behavior in both QGIS2 and QGIS3. Is this the > intended behavior? Is it by design that I am not able to use > init-files or is this simply a bug? Is there a known workaround? > > [cid:image001.png@01D38B96.E25BF930] > > There is no errors in the projection setup in the init-file, which > the working test transformation proves. The init file in question can > be seen here: > https://github.com/NordicGeodesy/NordicTransformations/blob/master/resources/DK. > I am aware that I can just add the definition of the CRS directly, or > simply use epsg:25832. That is not the point. I have other more > esoteric transformations in the same file that is more complicated to > manage in QGIS itself. > > I appreciate any advice and guidance. If this indeed is a bug I will > gladly help fix it. QGIS (via GDAL) needs a working inverse projection to be defined. Many exotic projections defined in PROJ.4 fail therefore. I guess the +proj=pipeline definitions spoil that requirement. I'm not even sure if those work in command-line GDAL. Greetings, Andre Joost ___ 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] Using custom projections/transformations from a PROJ.4 init-file
Am 12.01.2018 um 11:24 schrieb Kristian Evers: Hi, I am trying to define my own "custom projection" by using a PROJ.4 init-file. The reason I want to do that is that I only want to maintain the projections/transformations that I need in one place instead of many. I find the process a bit frustrating since at first glance it seems to be working, but then when I try to save it and close the custom projection dialog I am told that the definition is invalid. As it can be seen on the screenshot below, when I enter the PROJ.4 parameters - in this case "+init=C:\dev\NordicTransformations\resources\DK:UTM32N" - the test works fine but when I try to save it, I am presented with the message below. Since the test works the problem is not that the file can't be found - it is something else. I experience the same behavior in both QGIS2 and QGIS3. Is this the intended behavior? Is it by design that I am not able to use init-files or is this simply a bug? Is there a known workaround? [cid:image001.png@01D38B96.E25BF930] There is no errors in the projection setup in the init-file, which the working test transformation proves. The init file in question can be seen here: https://github.com/NordicGeodesy/NordicTransformations/blob/master/resources/DK. I am aware that I can just add the definition of the CRS directly, or simply use epsg:25832. That is not the point. I have other more esoteric transformations in the same file that is more complicated to manage in QGIS itself. I appreciate any advice and guidance. If this indeed is a bug I will gladly help fix it. QGIS (via GDAL) needs a working inverse projection to be defined. Many exotic projections defined in PROJ.4 fail therefore. I guess the +proj=pipeline definitions spoil that requirement. I'm not even sure if those work in command-line GDAL. Greetings, Andre Joost ___ 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] Using custom projections/transformations from a PROJ.4 init-file
Hi, I am trying to define my own "custom projection" by using a PROJ.4 init-file. The reason I want to do that is that I only want to maintain the projections/transformations that I need in one place instead of many. I find the process a bit frustrating since at first glance it seems to be working, but then when I try to save it and close the custom projection dialog I am told that the definition is invalid. As it can be seen on the screenshot below, when I enter the PROJ.4 parameters - in this case "+init=C:\dev\NordicTransformations\resources\DK:UTM32N" - the test works fine but when I try to save it, I am presented with the message below. Since the test works the problem is not that the file can't be found - it is something else. I experience the same behavior in both QGIS2 and QGIS3. Is this the intended behavior? Is it by design that I am not able to use init-files or is this simply a bug? Is there a known workaround? [cid:image001.png@01D38B96.E25BF930] There is no errors in the projection setup in the init-file, which the working test transformation proves. The init file in question can be seen here: https://github.com/NordicGeodesy/NordicTransformations/blob/master/resources/DK. I am aware that I can just add the definition of the CRS directly, or simply use epsg:25832. That is not the point. I have other more esoteric transformations in the same file that is more complicated to manage in QGIS itself. I appreciate any advice and guidance. If this indeed is a bug I will gladly help fix it. Best regards, Kristian ___ 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
