[GRASS-dev] Re: [GRASS GIS] #35: Verify and uncomment Swiss datum parameters

[GRASS GIS]

#35: Verify and uncomment Swiss datum parameters
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  Reporter:  neteler      |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect       |      Status:  new                      
  Priority:  major        |   Milestone:  6.4.0                    
 Component:  default      |     Version:  unspecified              
Resolution:               |    Keywords:                           
  Platform:  Unspecified  |         Cpu:  Unspecified              
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Comment (by msieczka):

 Replying to [comment:2 swisstopoum]:
 > CH1903 and CH1903+ are basically the same system (only defined a little
 bit differently).

 > The differences between the 2 systems are in the order of 1.5 m in
 maximum.

 Quite a difference.

 > Today we don't recommend the use of the 7 parameter transform any more.
 So please - whenever
 > possible - don't use them. For the transformation from CH1903+ to ETRS89
 we use officially the
 > following 3 parameters: dX=674.374 m, dY=15.056 m; dZ=405.346 m.

 Strange. Is 3 parameter transformation more accurate than the 7 one?

 > More information on the Swiss system and projection can be found here:
 > [http://www.swisstopo.admin.ch/internet/swisstopo/en/home/topics/survey
 >
 /sys/refsys.parsysrelated1.2487.downloadList.78978.DownloadFile.tmp/swissprojectionen.pdf]

 "Not found". Please pass a valid link.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/35#comment:3>
GRASS GIS <http://grass.osgeo.org>