The Sudanese SUD-GM2014 gravimetric geoid model has been computed from the available terrestrial mean free-air gravity anomalies, the TIM-R4 GOCE-only global geopotential model, and the high-resolution SRTM30_PLUS global digital elevation model. The computation has been performed by using the remove-compute-restore procedure and the least squares collocation method. Thereafter, the SUD-GM2014 model has been evaluated by using geoid heights at 19 GNSS/levelling points distributed over the country, showing an overall accuracy of 30 cm. However, this estimate of the geoid model quality could not be fully representative due to the low accuracy, very limited number and inhomogeneous distribution of the used GNSS/levelling control points. The SUD-GM2014 model has been recommended as reference for GNSS heighting in Sudan.

The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.

The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).