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Regional Models

France (RAF96)

  Author: H. Duquenne     Created: 1996    Resp: F. L'Ecu  
      Status: PUBLIC    
RAF96 is a hybrid geoid model for France. It is computed by fitting the QGF96 gravimetric quasi-geoid model to the nationwide RGF93 network of 979 GPS/levelling points by first removing a trend and then interpolating the residuals by collocation. Therefore the final model represents the height of the IGN69 reference surface above the GRS80 ellipsoid in the RGF93 geodetic reference frame, which is identical to ETRF89. Its validation based on 160 independent GPS/levelling points well distributed over France shows an overall standard deviation of 2.5 cm and a bias at the 1 cm level.

H. Duquenne (1997). Le modèle de quasi-géoïde français QGF96 et la surface de référence d'altitude RAF96. Ecole Supérieure des Géomètres et Topographes (ESGT), F91055-Evry, & Institut Géographique National (IGN), F94160-SaintMandé, France.
H. Duquenne (1997). Comparison between the EGM96 model and the French quasi-geoid model. IGeS Bulletin, 6, pp. 131-134.