#35: Verify and uncomment Swiss datum parameters --------------------------+------------------------------------------------- Reporter: neteler | Owner: grass-dev@lists.osgeo.org Type: defect | Status: new Priority: major | Milestone: 6.4.0 Component: default | Version: unspecified Resolution: | Keywords: Platform: Unspecified | Cpu: Unspecified --------------------------+------------------------------------------------- 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. -- Ticket URL: <http://trac.osgeo.org/grass/ticket/35#comment:6> GRASS GIS <http://grass.osgeo.org>
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