[Proj] OSGB36

John Smart john.smart at caris.com
Fri Jan 13 11:29:24 EST 2006

> As a start, where can one get the grid shift values? Is there only one
> standard set?
Try http://www.gps.gov.uk/additionalinfo/questDeveloper.asp

> Isn't there any Linux library that will do this (commercial is fine,
> too)?

No idea, but it's a fairly trivial bilinear interpolation with a simple text 
file. They include very detailed documentation on the algorithm for forward 
and reverse calculations.

Good luck. 

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