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Regional Models

Ghana (GGG2017)

  Authors: C.I. Yakubu, V.G. Ferreira, C.Y. Asante     Created: 2017    Resp: C.I. Yakubu 
      Status: PUBLIC    Licence: CC BY 4.0

The Ghanaian Gravimetric Geoid 2017 (GGG2017) covers the area between 4°N to 12°N and 4°W to 2°E. It is referred to the WGS84 reference ellipsoid and was computed using Heck and Grüninger’s modification of Stokes’ kernel in the framework of a remove-compute-restore approach. EGM2008 was used up to degree and order 222 to calculate the long-wavelength component of the geoid. A total of 499 surface gravity (from the Ghana Geological Survey Authority) and 29,249 marine gravity (from the Bureau Gravimétrique International) data were used to compute the GGG2017 model. Its validation was based on 11 GPS/trigonometric measurements, leading to the choice of the optimal maximum degree of EGM2008 and resulting in an overall accuracy of 45.7 cm. This means that the GGG2017 model can be used to replace second-order class II levelling, with an expected error of 6.8 mm/km for baselines ranging from 20 to 225 km.

Model Citation:
C.I. Yakubu, V.G. Ferreira, C.Y. Asante (2017). The Ghanaian gravimetric geoid: GGG2017. V. 1.0. GFZ Data Services. DOI: 10.5880/isg.2017.001

C.I. Yakubu, V.G. Ferreira, S. Asante (2017). Towards the selection of an optimal global geopotential model for the computation of the long-wavelength contribution: A Case study of Ghana. Geosciences, 7(4), 113. DOI: 10.3390/geosciences7040113

Web of Science ID:

Digital object identifier:
DOI: 10.5880/isg.2017.001 (geoid in ISG format)