Nouvelle Triangulation Francaise
EPSG
Institut Geographique National (IGN) document NTG_88.pdf, "Grille de parametres de transformation de coordonnees". http://www.ign.fr
2010-03-30
Transformation of coordinates at 1m level of accuracy.
May be used for transformation of NTF to/from ETR89 and WGS 84 as RGF93 may be considered equivalent to ETRS89 or WGS 84 within the accuracy of the transformation. See tfm codes 1054 and 15939. May be emulated using NTv2 method - see tfm code 15958.
France geocentric interpolation
France - onshore - mainland and Corsica.
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