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

Mikael Rittri Mikael.Rittri at carmenta.com
Wed Feb 1 04:00:37 EST 2012

There was a thread about making your own NTv2 files in April 2011.

It may be easiest to generate a new NTv2 file in ASCII format,
and then use an Australian program to convert it to binary.

Some posts from the thread:

Paul Kelly, http://lists.maptools.org/pipermail/proj/2011-April/005630.html

Gabor Molnar, http://lists.maptools.org/pipermail/proj/2011-April/005645.html

Uwe Schmitz, http://lists.maptools.org/pipermail/proj/2011-April/005647.html


Mikael Rittri

-----Original Message-----
From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Sandro Santilli
Sent: Tuesday, January 31, 2012 5:34 PM
To: proj at lists.maptools.org
Subject: [Proj] Further help with the swisstopo NTv2 grid shift ?

Now that I understood how to use the NTv2 gridshift file provided
by swisstopo (chaining transforms) I'd like to evaluate feasibility
of producing a _new_ NTv2 gridshift file going straight to WGS84
latlong rather than CH1903+ latlong.

How could I proceed to compute the shift ?

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