[Proj] [gdal-dev] Update of EPSG database to v8.4

[Even Rouault]

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
> 
> 
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