[Proj] Swiss Grid Systems

[Irwin Scollar]

Swiss Grid Systems

May I suggest that interested participants in this discussion thread open:

http://www.swisstopo.admin.ch/internet/swisstopo/en/home/apps/calc.html

and on the documentation entry on the right click on Reference system 
CH as well as on the Transformation CH1903<->WGS84  for the official 
version dated 19.11.2008?

They are available in English, German and French.

For those requiring higher accuracy for non-GIS geodetic 
purposes,  browse through the superb pages of the Swisstopo site for 
the finest documentation I have seen anywhere.

http://www.swisstopo.admin.ch/internet/swisstopo/en/home.html

The NTv2 grid data is available in the topic Transformation data and 
formulae CHENyx06 of March 2007. See for example

http://www.swisstopo.admin.ch/internet/swisstopo/de/home/products/downloads/software.html 
for much more.

Irwin Scollar