[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 swisstopoum):

 Just some comments to this:
 a) NTv2: I really think it would be fine to support NTv2. There are some
 countries who apply this approach (it was developped in Canada and then
 adopted in Australia, France, Germany,...). More and more commercial GIS
 developpers start to support this option.
 b) Distortions of triangulation networks: This is not a specific Swiss
 problem. Ok, the mountains play some role, but you have similar (or
 larger) distortions in all the traditional networks throughout the world.
 So, if you get (or give) a 7-parameter transformation set for such a
 national network, it is always only a rough approximation, which hardly
 gives results of better than 1 metre.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/35#comment:6>
GRASS GIS <http://grass.osgeo.org>