[Proj] PROJ: Further help with the swisstopo NTv2 grid shift ?

Sandro Santilli strk at keybit.net
Wed Feb 1 08:15:41 EST 2012

On Wed, Feb 01, 2012 at 04:31:03AM -0800, Melita Kennedy wrote:
> One method would be to calculate the CH1903+ to WGS84 offset for each NTv2 grid point, concatenate them with the offsets from the original file and build a new NTv2 file. EPSG lists a 1m transformation from CH1903+ to WGS84, do a code search for 1676 at http://www.epsg-registry.org. 

Great, sounds like what I did. Still unfinished. Will post for review
once completed.

> Disclaimer: I'm a member of the subcommittee that maintains the dataset.

Which dataset ? Swisstopo NTv2 or the epsg-registry ?


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