[Proj] OSGB36

[Martin Vermeer]

On Fri, Jan 13, 2006 at 11:28:10AM -0400, John Smart wrote:
 
> Could be nice if Proj would support this grid shift file, but what is 
> really needed (IMHO) is some standardization on such file formats so that a 
> plethora of different formats would not be needed. Ntv2 is something of a 
> standard but relates to lat/long differences not projection grid. 

I am afraid that train has left... Finland, e.g., is using affine
(bilinear) interpolation within triangles of a Delaunay triangulation.

I would think that PROJ4 would need a plug-in architecture with a well
defined API, into which different "grid transformers" can be plugged by
users.

- Martin

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