Transformation of coordinates at 1m level of accuracy.
Parameter values taken from OSGB 1936 / British National Grid to ETRS89 (2) (code 1039) assuming that ETRS89 is coincident with WGS 84 within the accuracy of the transformation. Replaces tfm code 1681. See tfm code 5339 for equivalent using NTv2 method.
Ordnance Survey National Transformation
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