OSTN02: ETRF89 Referenced OSGB

This projection is specifically used to convert between ETRS89 and Ordnance Survey®British National Grid using the OSTN02®transformation.

The National Grid Transformation OSTN02 is an interpolated grid of horizontal plane shift parameters covering GB at 1-km resolution, which converts ETRS89 GPS coordinates to National Grid coordinates with an accuracy of 20 cm (RMS). It takes no projection-specific parameters.

Note: ">Note:用户通常不应该使用这个projection to define their own systems – FME ships with the OSGB-GPS-2002 coordinate system, which is based on this projection.