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Regional Models

Canada (CGG2000)


  Author: M. Veronneau     Created: 2000    Resp: M. Veronneau  
      Status: ON-DEMAND   
Description:
The Canadian Geoid Model CGG2000 has been developed at the Geodetic Survey Division of Natural Resource Canada (http://www.nrcan.gc.ca). This gravimetric model extends from 20°N to 84°N and from 10°W to 170°W with a grid spacing of 2'. It is computed using the fast-fourier transform (FFT) with a modified spheroidal (degree: 30, cap: 6°) Stokes kernel, as well as the remove-restore technique. In particular the global gravity model is EGM96 up to degree and order 360, it defines the long wavelengths up to degree 30 and its coefficients from degree 31 to 360 contribute to the shorter wavelengths of the gravity field outside the six-degree integration cap. The Digital Elevation Model (DEM) for Canada is from provincial and federal sources; for the USA (including Alaska) the original version of the Digital Terrain Elevation Data (DTED) is used again in CGG2000 as it was used in GSD95; for Greenland the DEM and the ice thickness model are provided by KMS; finally, the elevations for the rest of the world are obtained from GTOPO30. The geodetic reference system is NAD83. The geoid model is validated using GPS/levelling data, showing differences with a mean of -36.1 cm and a standard deviation of 22.5 cm, which goes down to 8.7 cm after filtering out systematic errors.

References:
M. Veronneau (2001). The Canadian Gravimetric Geoid Model of 2000 (CGG2000)
. Report of Geodetic Survey Division, Natural Resources Canada, Ottawa.

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