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Regional Models

Cameroon (CGM05)

  Authors: J. Kamguia, et al.     Created: 2005    Resp: J. Kamguia  
      Status: ON-DEMAND   

The CGM05 gravimetric geoid of Cameroon was determined by a remove-restore technique with integration by Stokes' formula. It was computed using about 62,000 points on land and ocean areas and also including data derived from satellite altimetry. The long wavelength contribution of a hybrid global geopotential model (EGM-GGM) was remove from data. This global model was obtained by adjusting the GRACE model GGM02C to degree and order 360 using the harmonic coefficients of the model EGM96 beyond the maximal degree 200 of GGM02C. The digital terrain model GLOBE contributed to the short wavelengths in the residual terrain correction. A GPS/levelling geometric geoid computed in a small part of the target area shows that the absolute accuracy of this local geoid model is 14 cm. After a four-parameter fitting to the GPS/levelled reference surface, this absolute accuracy reduced to 11 cm.
The gravimetric geoid is provided in three colums (latitude and longitude in decimal degrees, and geoid undulation in meters).

J. Kamguia, C.T. Tabod, R. Nouayou, J.M. Tadjou, E. Manguelle-Dicoum, H.L. Kande (2007). The Local Geoid Model of Cameroon: CGM05. Nordic Journal of Surveying and Real Estate Research, 4(2), pp. 7-23.

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