Description:
The OSGM15 model is a hybrid geoid derived from precise gravity surveys across UK, Ireland, and surrounding waters; additionally, the model
includes data from the global geopotential model (EGM96) and the GRACE gravity mission (GGM02). A spherical FFT approach with modified
Stokes kernels is used for the computation of the gravimetric geoid. Then the alignment to each regional vertical datum is based on precise
GNSS observations at bench marks. Within Great Britain these include the Ordnance Survey fundamental bench mark (FBM) network. The resulting
hybrid geoids are referred to ETRS89. The estimated accuracy is of 1 cm rms for Mainland GB, Outer Hebrides and Scilly Isles, 2 cm for Orkney
and Shetland, and 3 cm for Isle of Man, while it is 2.3 cm std for Republic of Ireland and 1.4 cm std for Northern Ireland.
References:
M. Greaves, P. Downie, K. Fitzpatrick (2016). OSGM15 and OSTN15: Updated transformations for UK and Ireland. Geomatics World,
July/August 2016, pp. 18-21.
Web of Science ID:
DRCI:DATA2017015010667895
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