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On the Evaluation of the Derived Khartoum Geoid Models

This study was carried out to evaluate a newly developed local geoid model for the Khartoum State. Firstly, the geoid heights were obtained from the differences between observed WGS84 ellipsoidal heights and Khartoum State known orthometric heights. Secondly, the global well known EGM2008 geoid model was used to extract the geoid heights at 48 ground control stations, followed by generation of a geoid surface corrector. Thirdly, the geoid heights were also obtained by using an interpolation method. The three methods used for geoid determination were compared and evaluated. The geoid models’ uncertainties were evaluated at 6 test ground control points. The average difference between the derived geoid heights obtained from the geometrical geoid model, and their corresponding EGM2008 geoid heights was determined with a bias of about -0.28m. EGM2008 geoid model values in the area were corrected by the local bias value of 28 cm. The same known ground control points were used for the implementation of the interpolation geoid model. The differences between the geometrical geoid heights obtained from the differences between WGS84 ellipsoidal heights and orthometric heights at the given ground control points were compared with the geoid height values obtained from the improved local EGM2008 geoid and the interpolation method, the differences were found to be in the range of 4 cm and 5 cm respectively. This study showed that, the geoid heights in Khartoum State can be determined with the above two methods, namely the improved EGM2008 and the interpolation method with typical accuracy of better than 5cm.


APA Style

Kamal Abdellatif Sami, Ammar Mohammed Maryod Aborida. (2023). On the Evaluation of the Derived Khartoum Geoid Models. American Journal of Engineering and Technology Management, 8(2), 21-26.

ACS Style

Kamal Abdellatif Sami; Ammar Mohammed Maryod Aborida. On the Evaluation of the Derived Khartoum Geoid Models. Am. J. Eng. Technol. Manag. 2023, 8(2), 21-26. doi: 10.11648/j.ajetm.20230802.12

AMA Style

Kamal Abdellatif Sami, Ammar Mohammed Maryod Aborida. On the Evaluation of the Derived Khartoum Geoid Models. Am J Eng Technol Manag. 2023;8(2):21-26. doi: 10.11648/j.ajetm.20230802.12

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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