[PROJ] request for integration of optimized transformatiegrid BD72 to ETRS89

[Bas Couwenberg]

On 2019-02-14 15:53, Praet Karin wrote:
> The Belgian National Institute of Geography (NGI) has published a more
> accurate transformationgrid to convert between Belgian Datum 1972 tot
> ETRS 89.
> As Belgian Lambert 1972 (EPSG:31370), based on BD72,  is widely used
> in Belgium - is it possible to integrate this transformationgrid as
> the default transformation for this datum?

If the license for the grid is compatible with the Open Source 
Definition, the grid can be included in the proj-datumgrid project:

  https://github.com/OSGeo/proj-datumgrid

The license documented in the readme_nl.pdf file contained in the 
NTv2.zip says that it's CC-BY, but doesn't specify a version.

CC-BY v3.0 & v4.0 are DFSG compatible, so I recommend that you specify 
one of those versions.

Adding documentation in English is also a good idea, because the 
proj-datumgrid package has a global scope.

Kind Regards,

Bas