Abstract
The computation of the definitive OSTN02™ transformation is described. A background is given on the horizontal datums in use in Great Britain and on the meaning of a “definitive transformation”. The choice of transformation model for OSTN02 is then discussed followed by a detailed account of the data collection, transformation computation and testing. The procedure of building the final transformation data set and delivering it to users is then described.Compared to the previous transformation (OSTN97), OSTN02 contains a substantial increase in stations whose ETRS89 coordinates result from direct occupation with GPs. Testing indicates that OSTN02 has a 97.8% accuracy of 0.2 m. A new transformation data file has been made available to users.
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