Is it the same problem I had some years ago while doing some stuff on austrian coordinate system?
I took a picture at that time how ESRI solved to manage it https://dl.dropboxusercontent.com/u/11824349/greenshot_2011-07-12_11-54-23.jpg If yes .. than cedric knows what I am talking about :) regards Werner On Thu, Jul 4, 2013 at 11:30 AM, Radim Blazek <radim.bla...@gmail.com> wrote: > Note. The database from epsg.org does contain the correct > transformations (towgs84) 4836 (SK) and 5239 (CZ), the problem is that > each one is for a different territory but the same CRS. While the > relation between CRS and transformation in EPSG database is > (naturally) one-to-many, QGIS oversimplified the relation to > one-to-one. So all the evil comes from QGIS itself. We should probably > separate CRS from towgs84 and allow users to choose from multiple > towgs84 for CRS. > > Radim > > On Thu, Jul 4, 2013 at 11:00 AM, Radim Blazek <radim.bla...@gmail.com> wrote: >> On Thu, Jul 4, 2013 at 8:59 AM, Jürgen E. <j...@norbit.de> wrote: >>> 7805af3cf introduces a noupdate field in tbl_srs, that is set to 1 for the >>> mentioned CRSes. And crssync doesn't update or delete records marked like >>> that. >> >> Great, thanks. >> >>> But that flag should probably tracked somehow and set to 0 eventually, >>> when the CRSes get corrected in/introduced to geotiff/GDAL/proj.4. >> >> It seems that GDAL is occasionally synced with EPSG from libgeotif >> [1], no additional overrides. In [2] is described EPSG in libgeotif. >> They keep overrides separate in gcs.override.csv and pcs.override.csv, >> it is not clear to me if gcs/pcs.override.csv are used somehow by >> crssync or not. >> >> If I got it, If we want to get correct towgs84 params to srs.db in a >> clean way, they must be added to libgeotif gcs/pcs.override.csv and >> crssync must use them. >> >> BTW, we have a problem [2]: >> >> "Note that we deliberately keep alterations separate from the EPSG >> definitions >> in gcs.csv and pcs.csv to avoid violating the EPSG distribution license >> which requires that the definitions be distributed in unaltered form." >> >> Radim >> >> [1] http://trac.osgeo.org/gdal/log/trunk/gdal/data/pcs.csv >> [2] http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README >> >>> >>> Jürgen >>> >>> [1] http://en.wikipedia.org/wiki/DWIM >>> >>> -- >>> 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 >>> committ(ed|ing) to QGIS IRC: jef on FreeNode >>> >>> -- >>> norBIT Gesellschaft fuer Unternehmensberatung und Informationssysteme mbH >>> Rheinstrasse 13, 26506 Norden >>> GF: Jelto Buurman, HR: Amtsgericht Emden, HRB 5502 >>> >>> _______________________________________________ >>> 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 _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer