[GRASS5] error in French projection definition

[Moritz Lennert]

Moritz Lennert wrote:
> Hello,
> 
> On the french-speaking list a discussion has been taking place 
> concerning the definition of the French NTF datum. Apparently it is not 
> correct as datum.table defines it as using clark80, but the definition 
> of clark80 in ellipse.table does not correspond exactly to the one used 
> by the French geographical institute.
> 
> I am quite unknowledgeable both about projections and about the way they 
> function in GRASS, especially the interplay between the GRASS 
> definitions and the proj definitions. So before I do anything wrong or 
> unnecessary:
> 
> - Should I change the two files to reflect the correct defintions. 
> Mathieu Basille proposes the following changes:
> 
> In datum.table :
> # Nouvelle Triangulation Française
> ntf      "Nouvelle Triangulation Française"      clark80IGN    dx=-168.0 
>    dy=-60.0    dz=320.0
> 
> In ellipse.table :
> # Clarke 1880 IGN
> clark80IGN      "Clarke 1880 IGN"               a=6378249.200 
> f=1/293.466021294
> 


Since no one told me not to, I will just commit these changes to the two 
files.

Moritz