Since you guys both know more about PROJ4 than I do I thought I would just tag this question on; Where is QGIS/PROJ4 with support for vertical datums? Is there a way I can attach a vertical datum to a CRS in PROJ4? Tyler
On Mon, Oct 23, 2017 at 9:09 AM, Tyler Veinot <tylerkvei...@gmail.com> wrote: > Andre; > It seems QGIS does not like my gsb file, I downloaded the NTV2 gsb from > NRCan and pointed to it and it worked. For some reason the one specific for > PEI does not. However, the grid shift could be the same as far as I know; > cannot find any information on what mathematical principles are used to > define the shift to correct the coordinates. > Tyler > > On Mon, Oct 23, 2017 at 8:01 AM, André Joost <andre.jo...@arcor.de> wrote: > >> Am 20.10.2017 um 20:19 schrieb Tyler Veinot: >> >>> Andre; >>> Again, sorry accidently sent the email mid writing. Where was I.... >>> Right so I added >>> >>> nadgrids=PE7783V2.gsb a number of ways trying to sort it based on online >>> information and how some other CRS's were setup within QGIS but nothing >>> worked yet. >>> >> >> It might be better to post the full string. >> >> >> When I add the directory to my gsb where do I add it in the line and does >>> it need quotes? >>> >> >> If you have blanks in folder names, surely. >> >> HTH, >> André Joost >> >> >> >>> >>> On Fri, Oct 20, 2017 at 2:55 PM, Andre Joost <andre+jo...@nurfuerspam.de >>> > >>> wrote: >>> >>> Am 20.10.2017 um 14:31 schrieb Tyler Veinot: >>>> >>>> Anyone knowledge in using grid shift files (gsb) with QGIS? >>>>> I have a local CRS NAD27 Double Stereographic Imperial that I need to >>>>> transform to NAD83 CSRS 2010 Epoch. I have the CRS properly defined >>>>> using >>>>> the provincial description >>>>> >>>>> >>>> Can you add your custom CRS? Maybe you have +datum=nad27 which uses the >>>> main nadcon transformation file. use +ellps=clrk66 >>>> +nadgrids=/path/to/your/file >>>> >>>> but QGIS using its Clark 1866 to GRS80 >>>> >>>> transformation puts the points a little off from the NTV2 coordinate >>>>> transformation software we have. I have the GSB used (even though it >>>>> says >>>>> ATS77 the provincial geomatics guys tell me it shits NAD27 and ATS77 >>>>> into >>>>> CSRS 2010 NAD83). I followed some directions on putting the file in a >>>>> specific folder and restarted QGIS set the settings to always ask for >>>>> grid >>>>> shift file for transformations yet I do not see the one I put in there >>>>> in >>>>> my list to pick from. >>>>> >>>>> >>>> Can you explain where that setting should be? >>>> >>>> >>>> I also tried to install a plugin for NTV2 transformations but cannot >>>> >>>>> activate it. When I go to Activate Additional Providers in my >>>>> Processing >>>>> Toolbox where NTv2 Datum Transformations resides I get the "Specified >>>>> Path >>>>> does not exist: C:\PROGA~1\QGIS~1.18\bin" error that I have not yet >>>>> managed >>>>> to resolve. To my understanding has something to do with GRASS plugins >>>>> and >>>>> past versions of QGIS. >>>>> >>>>> >>>> You can workaround that GRASS error by creating that folder, or changing >>>> the folder entry for GRASS 7 to an existing folder. >>>> But to use your grid in the plugin, you would need some python code >>>> around >>>> it, like the other grids have in C:\Users\<username>\.qgis2\pyt >>>> hon\plugins\ntv2_transformations >>>> Without that processing would not know about your grid. >>>> >>>> HTH, >>>> André 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 >>>> >>>> >>> >> >> >
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