Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Il 17/02/2015 20:56, Jürgen E. Fischer ha scritto: Hi Andreas, On Tue, 17. Feb 2015 at 21:29:24 +0100, Andreas Neumann wrote: I think the grids of the major countries should be included in QGIS core. E.g. the german gsb file is only 87 kb. This could easily be distributed with QGIS core. Redistributable files should IMHO be shipped with PROJ.4. http://trac.osgeo.org/proj/ lists a bunch of third party grids - including the BETA2007 - but it's not clear if the files are redistributable. obviously the best choice, thanks Juergen. re: the Portuguese plugin: why not publishing in the officail repo, as a first step? All the best, and thanks. -- Paolo Cavallini - www.faunalia.eu QGIS PostGIS courses: http://www.faunalia.eu/training.html *New course* QGIS for naturalists: http://www.faunalia.eu/en/nat_course.html signature.asc Description: OpenPGP digital signature ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi Bernd, Here [0] we have an explanation of how the coordinate systems works in general, and in particular in QGIS. You also find solutions to use the NTv2 grids with QGIS. Unfortunately, the text is in portuguese, but perhaps Google Translate can help [1]. This is a way that each user must do individually. To make life easier for portuguese users, as we also have a lot of information that needs to be transformed to ETRS89, portuguese QGIS User Group developed the plugin that Giovanni told you [2], which greatly simplifies things, because it is integrated into Processing Toolbox and already provides the NTv2 grids. As Giovanni said, if there is interest from other countries and if we can freely redistribute the NTv2 grids, we can expand the plugin. Best regards, Pedro Venâncio [0] http://qgis.pt/blog/2014/07/13/transformacao-de-coordenadas-e-utilizacao-das-grelhas-ntv2-no-qgis/ [1] https://translate.google.pt/translate?sl=pttl=enjs=yprev=_thl=pt-PTie=UTF-8u=http%3A%2F%2Fqgis.pt%2Fblog%2F2014%2F07%2F13%2Ftransformacao-de-coordenadas-e-utilizacao-das-grelhas-ntv2-no-qgis%2Fedit-text=act=url [2] http://www.qgis.pt/plugins/plugins.xml ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi Giovanni, thanx for your answer. Just contacted the organization which might be in charge to answer the question about the circumstances to redistribute that file. I hope we are talking of the same stuff: I mean this one http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/BETA2007.gsb or http://crs.bkg.bund.de/crseu/crs/descrtrans/BeTA/BETA2007.gsa Sorry, this topic is quite new for me, so I do not really know what I am talking about ;) But do I see it correctly, that the normal way to reproject a layer with Save as ... will produce quite inaccurate results, and that the users have to be aware that they could/should use a plugin? So there will be two ways to reproject the data,the default one (not so accurat) and a plugin version (more accurate)? Cheers Bernd Am 17.02.2015, 16:13 Uhr, schrieb Giovanni Manghi giovanni.man...@gmail.com: Hi Bernd Hi there, reactivating this thread and also pushing it to the dev list to maybe receive a statement: Is it somehow planned to include the BETA2007.gsb and the resulting changes into QGIS for 2.8 by default? I received already some questions, cause now even german bureaucracy is waking up and tell users to switch to ETRS and transform the data from Gauss-Krueger. But for the majority of QGIS users, this will be rocket science if they even learn THAT they have to create custom CRS, change srs.db entries and do other wizardry. So far, googling QGIS and BETA2007 yields no results on any moves into this direction. But without, QGIS users in Germany will likely produce tons of trash data in the near future or already do so without knowing (me included till today). Also see https://hub.qgis.org/issues/11347 ... or is is not that critical as I believe it is? exactly because ntv2 transformations should not be rocket sciemce for the users, we (Portuguese qgis user group, with the initial help of Alexander Bruy) created this plugin http://www.qgis.pt/plugins/plugins.xml Given that you can redistribute the gsb files (and for Portugal this is possible) then the ntv2 transformations become trivial. I had already had a thought of expanding this plugin and adding the transfomations for countries that have available gsb grids and allow them to redistribute. If someone is interested or need it just let me know. Cheers -- Giovanni Manghi http://www.naturalgis.pt/ * QGIS Desktop development * WebGIS development * QGIS and PostGIS Training --- -- Bernd Vogelgesang Siedlerstraße 2 91083 Baiersdorf/Igelsdorf Tel: 09133-825374 ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi Bernd Hi there, reactivating this thread and also pushing it to the dev list to maybe receive a statement: Is it somehow planned to include the BETA2007.gsb and the resulting changes into QGIS for 2.8 by default? I received already some questions, cause now even german bureaucracy is waking up and tell users to switch to ETRS and transform the data from Gauss-Krueger. But for the majority of QGIS users, this will be rocket science if they even learn THAT they have to create custom CRS, change srs.db entries and do other wizardry. So far, googling QGIS and BETA2007 yields no results on any moves into this direction. But without, QGIS users in Germany will likely produce tons of trash data in the near future or already do so without knowing (me included till today). Also see https://hub.qgis.org/issues/11347 ... or is is not that critical as I believe it is? exactly because ntv2 transformations should not be rocket sciemce for the users, we (Portuguese qgis user group, with the initial help of Alexander Bruy) created this plugin http://www.qgis.pt/plugins/plugins.xml Given that you can redistribute the gsb files (and for Portugal this is possible) then the ntv2 transformations become trivial. I had already had a thought of expanding this plugin and adding the transfomations for countries that have available gsb grids and allow them to redistribute. If someone is interested or need it just let me know. Cheers -- Giovanni Manghi http://www.naturalgis.pt/ * QGIS Desktop development * WebGIS development * QGIS and PostGIS Training --- ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi there, reactivating this thread and also pushing it to the dev list to maybe receive a statement: Is it somehow planned to include the BETA2007.gsb and the resulting changes into QGIS for 2.8 by default? I received already some questions, cause now even german bureaucracy is waking up and tell users to switch to ETRS and transform the data from Gauss-Krueger. But for the majority of QGIS users, this will be rocket science if they even learn THAT they have to create custom CRS, change srs.db entries and do other wizardry. So far, googling QGIS and BETA2007 yields no results on any moves into this direction. But without, QGIS users in Germany will likely produce tons of trash data in the near future or already do so without knowing (me included till today). Also see https://hub.qgis.org/issues/11347 ... or is is not that critical as I believe it is? Cheers Bernd Am 05.02.2014, 16:13 Uhr, schrieb Marco Hugentobler marco.hugentob...@sourcepole.ch: Hi Would it be possible to define a Custom CRS for the source CRS containing the nadgrids-stuff for doing ntv2 transformation in QGIS 2.0.1? Yes, it is possible to work with custom CRS (although it is not so convenient). Is this already in 2.1? If yes, where could one find it? There is a dialog showing the available datum transformations. This dialog shows up as soon as a layer needs a datum transformation (e.g. if on-the-fly reprojection is toggled or when doing save as'). However, the ntv2 transformation info has to be inserted into srs.db / table datum_transform first. Regards, Marco On 05.02.2014 15:42, Robert Nuske wrote: Hi Marco, QGIS 2.2 will have support for NTv2 datum transformations as a core function. Is this already in 2.1? If yes, where could one find it? Would it be possible to define a Custom CRS for the source CRS containing the nadgrids-stuff for doing ntv2 transformation in QGIS 2.0.1? For example GK3: +proj=tmerc +lat_0=0 +lon_0=9 +k=1.00 +x_0=350 +y_0=0 +ellps=bessel +units=m +nadgrids=BETA2007.gsb +wktext cheers, robert On 05.02.2014 13:34, Burgstaller Stefan wrote: Hi, is it already possible to reproject shape-files using NTv2 grids? I was looking for appropriate plugins, help documents and already available tools but I have not found anything. Since the federal states in Germany start to convert their geospatial data from Gauss-Kruger to ETRS89 with NTv2 grids this topic becomes more and more urgent. Greetings, Stefan Burgstaller ___ Qgis-user mailing list qgis-u...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list qgis-u...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user -- Bernd Vogelgesang Siedlerstraße 2 91083 Baiersdorf/Igelsdorf Tel: 09133-825374 ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Am 17.02.2015 um 17:33 schrieb Pedro Venâncio: Here [0] we have an explanation of how the coordinate systems works in general, and in particular in QGIS. You also find solutions to use the NTv2 grids with QGIS. Unfortunately, the text is in portuguese, but perhaps Google Translate can help [1]. To be honest, gooogle translate is of limited help for people who use English only as a second language. I think it would help more if you set up a special English page, as the Dutch QGIS community does for issues with worldwide interest. And http://planet.qgis.org/planet/ would be a good platform to promote those topics. This is a way that each user must do individually. To make life easier for portuguese users, as we also have a lot of information that needs to be transformed to ETRS89, portuguese QGIS User Group developed the plugin that Giovanni told you [2], which greatly simplifies things, because it is integrated into Processing Toolbox and already provides the NTv2 grids. As Giovanni said, if there is interest from other countries and if we can freely redistribute the NTv2 grids, we can expand the plugin. There are lots of ntv2 grids available for free, and telling the user : Put your local ntv2 grid in here is affordable. That works for non-free grids too. Greetings, André Joost ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi, I think the grids of the major countries should be included in QGIS core. E.g. the german gsb file is only 87 kb. This could easily be distributed with QGIS core. It is the duty of the local QGIS user groups to come up with a solution for their users - either by bundling it in QGIS core or through a plugin or good tutorial. It would make the life much easier for the average user. Andreas On 17.02.2015 17:33, Pedro Venâncio wrote: Hi Bernd, Here [0] we have an explanation of how the coordinate systems works in general, and in particular in QGIS. You also find solutions to use the NTv2 grids with QGIS. Unfortunately, the text is in portuguese, but perhaps Google Translate can help [1]. This is a way that each user must do individually. To make life easier for portuguese users, as we also have a lot of information that needs to be transformed to ETRS89, portuguese QGIS User Group developed the plugin that Giovanni told you [2], which greatly simplifies things, because it is integrated into Processing Toolbox and already provides the NTv2 grids. As Giovanni said, if there is interest from other countries and if we can freely redistribute the NTv2 grids, we can expand the plugin. Best regards, Pedro Venâncio [0] http://qgis.pt/blog/2014/07/13/transformacao-de-coordenadas-e-utilizacao-das-grelhas-ntv2-no-qgis/ [1] https://translate.google.pt/translate?sl=pttl=enjs=yprev=_thl=pt-PTie=UTF-8u=http%3A%2F%2Fqgis.pt%2Fblog%2F2014%2F07%2F13%2Ftransformacao-de-coordenadas-e-utilizacao-das-grelhas-ntv2-no-qgis%2Fedit-text=act=url [2] http://www.qgis.pt/plugins/plugins.xml ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
Re: [Qgis-developer] [Qgis-user] Transformation using NTv2 grids
Hi Andreas, On Tue, 17. Feb 2015 at 21:29:24 +0100, Andreas Neumann wrote: I think the grids of the major countries should be included in QGIS core. E.g. the german gsb file is only 87 kb. This could easily be distributed with QGIS core. Redistributable files should IMHO be shipped with PROJ.4. http://trac.osgeo.org/proj/ lists a bunch of third party grids - including the BETA2007 - but it's not clear if the files are redistributable. BTW the BETA2007 grid is already supported in QGIS' datum transforms. It will offer a transformation using the grid if it's available. Jürgen -- Jürgen E. Fischer norBIT GmbH Tel. +49-4931-918175-31 Dipl.-Inf. (FH) Rheinstraße 13 Fax. +49-4931-918175-50 Software Engineer D-26506 Norden http://www.norbit.de QGIS release manager (PSC) GermanyIRC: jef on FreeNode signature.asc Description: Digital signature ___ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
