Le jeudi 15 mai 2014 16:56:26, Andre Joost a écrit : > Am 14.05.2014 12:53, schrieb Even Rouault: > > Regarding PROJ.4 'espg' and PostGIS spatial_ref_sys.sql files, I've also > > added the list of SRS that are GEOCCS (GeoCentric) and COMPD_CS > > (Compound Horizontal + Vertical). > > > > Please let me know if you see issues. > > The GEOCGS will likely cause a lot of confusion. They need three > coordinates (X/Y/Z), while most GIS software is still in 2D-mode > (lat/lon or X/Y). As a consequence, inverse projection (or > on-the-fly-reprojection) is not possible if the third coordinate is > lost. See > http://gis.stackexchange.com/questions/95729/help-defining-custom-crs-in-qg > is-2-2 for an example.
It is the responsibility of people using those codes to use them correctly... > > BTW, any chance to get my http://trac.osgeo.org/proj/ticket/235 included? > It is just about datum shift of the Czech Republic bound to East German > Pulkovo projections, which leads to unwanted datum shifts. Not saying I would take charge of that myself, but I don't see a patch. The patch would need to be done in the datum_shift_pref.csv file of libgeotiff. More points if you can modify the logic of build_pcs.py to select the right datum shift ! > > Greetings, > André Joost > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
