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Regional Models

Canada (GSD91)

  Author: M. Veronneau, A. Mainville     Created: 1991    Resp: M. Veronneau  
      Status: ON-DEMAND   
The Canadian Geoid Model GSD91 has been developed at the Geodetic Survey Division of Natural Resource Canada ( This gravimetric model extends from 41°N to 72°N and from 46°W to 142°W with a grid spacing of 5'. It is computed using the fast-fourier transform (FFT) with a standard (planar) Stokes kernel, as well as the remove-restore technique. In particular the OSU91A global gravity model is used along with new digital elevation model data over various regions of the country. The geodetic reference system is NAD83. The geoid model is validated using GPS/levelling data, showing differences with a mean of -79.4 cm and a standard deviation of 79 cm, which goes down to 69.5 cm after filtering out systematic errors.

M. Veronneau, A. Mainville (1992). Computation of a Canadian geoid model using the FFT technique to evaluate Stokes' and Vening-Meinesz' formulas in a planar approximation. Presented at the AGU-CGU-MSA Joint Spring Meeting, Montreal, Quebec, May 12-16.

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