[QGIS-trac] Re: [Quantum GIS] #3437: Add natgrid to IGNF's RGF93 projections

[Quantum GIS]

#3437: Add natgrid to IGNF's RGF93 projections
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        Reporter:  jrm                               |         Owner:  jef          
            Type:  patch                             |        Status:  closed       
        Priority:  major: does not work as expected  |     Milestone:  Version 1.7.0
       Component:  Projection Support                |       Version:  Trunk        
      Resolution:  invalid                           |      Keywords:  IGNF         
Platform_version:                                    |      Platform:  All          
        Must_fix:  No                                |   Status_info:  0            
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Comment(by jrm):

 sorry if it wasn't clear, I'm not saying there is errors in the IGNF as
 the proj definitions work as attented when working between RGF93 based
 layers or when projecting NTF layers to RGF93. However, some users needs
 to do the reverse job (RGF93 to NTF, not talking WG84) and with the
 official defs the natgrid isn't used and so cause a 50m error.

 Please have a look to this thread (french), there is a use case and files
 to test :
 http://www.forumsig.org/showpost.php?p=257466&postcount=24

 About proj4, a ticket and a patch for the updated and official register
 have been submitted on trac (#88) 3 months ago but is still pending and
 its avaibality will depend on a proj4's release (this the reason behind
 #3394, pending too). About #3437, as it is an unofficial modification I
 didn't wanted to push it first into proj4.

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/3437#comment:3>
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