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Dr.-Ing. Basem Elsaka


 Dr.-Ing. Basem Elsaka

  • Function:

Academic, Administrative and Technical Staff Member

  • Email:

 elsaka [at] geod [dot] uni-bonn [dot] de

  • Phone:

+49 228 73-2750

  • Fax:

+49 228 73-3029

  • Room:


  • Address:

Institute of Geodesy and Geoinformation

Nussallee 17

D-53115 Bonn

Professional profile

  • Since 2017  Academic, admenstrative and technical Staff member at the Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group) of the University of Bonn.

  • 20142015 Scientific consultant at Space and Aviation Research Institute, King Abdulaziz City of Science and Technology (KACST), Riyadh, Saudi Arabia.

  • 20102013 Research associate at the Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group) at the University of Bonn.

  • 2010: Ph.D. in Geodesy, Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group) of the University of Bonn.

  • 20062009 Ph.D. student at the Institute of Geodesy and Geoinformation (Astronomical Physical and Mathematical Geodesy Group), University of Bonn. 

  • 2003 2005: Research Associate at the National Research Institute of Astronomy and Geophysics, Cairo, Egypt.

  • 2003: M.Sc. in Geophysics, Faculty of Science, Helwan University, Cairo, Egypt.

  • 1999 2003: Research Assistant at the National Research Institute of Astronomy and Geophysics, Cairo, Egypt.

  • 1999: B.Sc. in Geophysics, Faculty of Science, Mansoura University, El-Mansoura, Egypt.



  • Physical and Satellite Geodesy.

  • Terrestrial Gravimetry.


  • Optimal configuration design for future satellite gravity field missions (in low-low satellite-to-satellite tracking mode).

  • Determination of the static and time-dependent gravity fields from different satellite formation flights, e.g. GRACE, GRACE Follow-On, Multi-GRACE-Type, Cartwheel-Type, LISA-Type, Helix-Type, Pendulum-Type, Bender-Type Constellations.

  • Modeling of geoid heights using terrestrial and satellite gravity field observations in the sense of Least-Squares collocation approach and Remove-Compute-Restore method.



Functions (Selection)



  • El-Ashquer, M., Elsaka, B., Mogren, S., Abdelmohsen, K., Zaki, A., (2023). Assessment of changing satellite gravity mission architectures using terrestrial gravity and GNSS-leveling data in the Kingdom of Saudi Arabia.The Egyptian Journal of Remote Sensing and Space Science, 26 (2), pp. 285-292,

  • Elsaka, B., Abdelmohsen, K., Alshehri, F., Zaki, A., El-Ashquer, M. (2022). Mass Variations in Terrestrial Water Storage over the Nile River Basin and Mega Aquifer System as Deduced from GRACE-FO Level-2 Products and Precipitation Patterns from GPCP Data. Water, 14(23), 3920.

  • Elsaka, B., Francis, O., Kusche, J. (2022). Calibration of the Latest Generation Superconducting Gravimeter iGrav-043 Using the Observatory Superconducting Gravimeter OSG-CT040 and the Comparisons of Their Characteristics at the Walferdange Underground Laboratory for Geodynamics, Luxembourg.  Pure Appl. Geophys.

  • Elsaka, B., El-Ashquer, M. (2022). Determination of Local Quasi-Geoid Models using FFT Estimation Technique based on Combined Gravity Anomalies from CHAMP, GRACE, GOCE, Future Satellite Missions and in-Situ Gravity observations in Western Desert of Egypt, IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG), 10(1), pp. 15-24. DOI:10.9790/0990-1001031524.

  • Elsaka, B. (2022). Combined observables in different inter-satellite line-of-sight directions from simulated satellite gravity mission architectures for retrieving total water storage – regional case study: the Nile River Basin. Survey Review, 54:385, 339-348

  • Saadon, A, El-Ashquer, M., Elsaka, B., El-Fiky, G (2022). Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets. Survey Review, 54:384, 263-273,

  • Elsaka, B., El-Ashquer, M. (2022) Comparison between Gaussian and decorrelation filters of GRACE-based RL05 temporal gravity solutions over Egypt. Survey Review, 54:384, 233–242, doi.10.1080/00396265.2021.1919841.

  • Elsaka, B. (2021) Evaluation of Terrestrial Total Water Height Variations over the Nile River Basin Based on Two Full-Years of GRACE-FO Gravity Field Monthly Solutions. International Research Journal of Advanced Engineering and Science (IRJAES), 6(1), pp. 90-95. IRJAES-V6N1P55Y21.

  • Elsaka, B. (2020) Comparison of Different Polynomial Degrees for Correcting the Instrumental Drift of Scintrex CG-5 Autograv Gravimeter. Australian Journal of Basic and Applied Sciences 14(5):19-25, doi:10.22587/ajbas.2020.14.5.3.

  • Aly, O. S., Elsaka, B., Al Khatibi, E. A.  (2020) Practical Experiences with the First Relative Gravimeter of Type Scintrex CG-6 Autograv in Dubai, The United Arab of Emirates. World Journal of Engineering and Technology, 8(2), 237-247.

  • Elsaka, B., Radwan, A. M., Rashwan, M. (2020). Evaluation of Nile Delta-Mediterranean Sea Conjunction Using GPS, Satellite-Based Gravity and Altimetry Datasets. Journal of Geoscience and Environment Protection, 8(2), 33-46.

  • Elsaka, B. (2019) Spatio-Temporal Polar-Inclined Space Mission Architecture for a Refined Retrieve of the Earth’s Gravity Field. World Journal of Engineering and Technology, 7(4), 640-651.

  • Saadon, A. Elsaka, B., El-Ashquer, M., El-Fiky, G. (2019) Regional Evaluation of GOCE-Based GGMs with Ground-Based Gravity and GPS/Levelling Data over Egypt. International Journal of Geosciences,10(6), pp.652–668, doi:10.4236/ijg.2019.106037.

  • El-Ashquer, M., Elsaka, B., El-Fiky, G. (2017) EGY-HGM2016: An Improved Hybrid Local Geoid Model for Egypt based on the Combination of GOCE-based Geopotential Model with Gravimetric and GNSS/Levelling Measurements. Arabian Journal of Geosciences (AJGS), 10(11),

  • El-Ashquer, M., Elsaka, B., El-Fiky, G. (2016) On the Accuracy Assessment of the Latest Releases of GOCE satellite-based Geopotential Models with EGM2008 and Terrestrial GNSS/Levelling and Gravity Data over Egypt. International Journal of Geosciences,7(11), pp.1323–1344, doi:10.4236/ijg.2016.711097.

  •  Alothman, A., Fernandes, R., Bos, M., Schillak, S., Elsaka, B. (2016) Angular Velocity of Arabian Plate from Multi-Year Analysis of GNSS data. Arabian Journal of Geosciences (AJGS),  9(8),

  • Alothman, A., Godah, W., Elsaka, B. (2016) Gravity field anomalies from recent GOCE satellite-based geopotential models and terrestrial gravity data: A comparative study over Saudi Arabia. Arabian Journal of Geosciences (AJGS), 9(5),

  • Alothman, A., Elsaka B. (2016) First Release of Gravimetric Geoid Model over Saudi Arabia Based on Terrestrial Gravity and GOCE Satellite Data: KSAG01, Poster in European Geosciences Union, General Assembly 2016, Vienna, Austria, 17–22 April 2016.

  • Elsaka, B., Alothman, A., Godah, W. (2016) On the Contribution of GOCE Satellite-Based GGMs to Improve GNSS/Leveling Geoid Heights Determination in Saudi Arabia. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 9, no. 12, pp. 5842-5850, Dec. 2016, doi:10.1109/JSTARS.2015.2495193.

  • Alothman, A, Elsaka, B. (2015) Gravity Field Solution Derived from Recent Releases of GOCE-Based Geopotential Models and Terrestrial Gravity Observations over The Kingdom of Saudi Arabia. Proc. ‘5th International GOCE User Workshop’, 24–28 November 2014 Paris, France (ESA–SP Vol.728, March 2015), doi.2015ESASP.728E..30A.

  • Elsaka, B., Ilk, K.-H., Alothman, A. (2015) Mitigation of Oceanic Tidal Aliasing Errors in Space and Time Simultaneously Using Different Repeat Sub-Satellite Tracks from Pendulum-Type Gravimetric Mission Candidate. Acta Geophysica, 63(1), pp. 301–318,

  •  Alothman, A., Feng, W., Fernanded, R., Bos, M., Elsaka B. (2014) Seasonal mass changes in the Red Sea observed by GPS and GRACE, Poster in AGU 2014 Fall Meeting, San Francisco, California, USA, 15 – 19/12/2014. 

  • Alothman, A., Elsaka B. (2014) Gravity field solutions derived from recent GOCE-based geopotential models and insitu gravity observations over Saudi Arabia, Poster in 5th International GOCE User Workshop 25–29 November 2014, UNESCO, Paris, France.

  • Elsaka B., Forootan, E., Kusche, J., Alothman, A. (2014) Regional hydrological recovery using one year of simulated observations of the GRACE and Bender constellations,  Poster in European Geosciences Union (EGU), General Assembly, 27/04 to 02/05/2014 Vienna, Austria.

  • Alothman, A., Grebenitcharsky, R., Elsaka B. (2014) Wavelet Multi-Resolution Analysis for Gravimetric Geoid over Saudi Arabia, Poster in European Geosciences Union (EGU), General Assembly, 27/04 to 02/05/2014 Vienna, Austria.

  • Reubelt, T., Sneeuw, N., Iran Pour, S., Hirth, M., Fichter, W., Müller, J., Brieden, Ph., Flechtner, F., Raimondo, J.-C., Kusche, J., Elsaka, B., Gruber, T., Pail, R., Murböck, M., Doll, B., Sand, R., Wang, X., Klein, V., Lezius, M., Danzmann, K., Heinzel, G., Sheard, B., Rasel, E., Gilowski, M., Schubert, C., Schäfer, W., Rathke, A., Dittus, H. and Pelivan, I. (2014) Future Gravity Field Satellite Missions. Flechtner, F., Sneeuw, N., Schuh, W.-D. (Eds.), Observation of the System Earth from Space - CHAMP, GRACE, GOCE and future missions. GEOTECHNOLOGIEN Science Report No. 20, Series "Advanced Technologies in Earth Sciences"Springer, ISBN 978-3-642-32134-4,

  • Elsaka, B. (2014) Feasible Multiple Satellite Mission Scenarios Flying in a Constellation for Refinement of the Gravity Field Recovery. In: International Journal of Geosciences, 5(3), pp. 267–273, doi.10.4236/ijg.2014.53027.

  • Elsaka, B. (2014) Sub-monthly Gravity Field Recovery from Simulated Multi-GRACE Mission Type. Acta Geophysica, 62(1), pp. 241–258,

  • Elsaka, B., Forootan, E., Alothman, A. (2014) Improving the recovery of monthly regional water storage using one year simulated observations of two pairs of GRACE-type satellite gravimetry constellation. Journal of Applied Geophysics, 109, pp. 195–209,

  • Elsaka, B., Raimondo, J.-C., Brieden, Ph., Reubelt, T., Kusche, J., Flechtner, F., Iran-Pour, S., Sneeuw, N., Müller, J. (2014) Comparing seven candidate mission configurations for temporal gravity field retrieval through full-scale numerical simulation. Journal of Geodesy, 88(1), pp. 31–43,

  • Forootan, E., Didova, O., Schumacher, M., Kusche, J., Elsaka, B. (2014) Comparisons of atmospheric mass variations derived from ECMWF reanalysis and operational fields, over 2003 to 2011. Journal of Geodesy, 88(5), pp. 503–514,

  • Elsaka, B., Kusche, J., Ilk, K.-H. (2012) Recovery of the Earth's gravity field from formation-flying satellites: temporal aliasing issues. Advances in Space Research, 50(11), pp. 1534–1552,  

  • Elsaka, B., Raimondo, J.-C., Kusche, J., Flechtner, F. (2012) Gravity Field Results from Satellite Mission Scenarios. Poster in Geotechnologien-Abschlussseminar, 24/05/2012, Potsdam, Germany.

  • Raimondo, J.-C., Elsaka, B., Neumayer, K.-H., Flechtner, F., Kusche, J. (2011) Numerical Simulations of new Gravity Mission Concepts. Geotechnologien Status-Seminar „Weltraum Phase III“, 11/10/2011, Stuttgart, Germany.

  •  Elsaka, B., Kusche, J. (2010) Optimized Gravity Field Determination from Future Satellite Missions [WP 110]. Scince Report, Geotechnologien Status-Seminar „Weltraum Phase III“, 04/10/2010, Bonn, Germany.

  • Elsaka, B. (2010) Simulated Satellite Formation Flights for Detecting the Temporal Variations of the Earth's Gravity Field. Ph.D. Dissertation, University of Bonn,

  • Elsaka B., Ilk, K. H., Kusche, J. (2009) Simulated Multiple Formation Flights for Future Gravity Field Recovery, Poster in European Geosciences Union (EGU), General Assembly, 19-24/04/2009 Vienna, Austria.

  • Elsaka B., Ilk, K.-H. (2008) Gravity Field Recovery of the Earth from Simulated Multiple GRACE-Type Missions. Poster in the Geodetic Week, 30/09-02/10/2008 Bremen, Germany.

  • Elsaka, B. (2003) Forth Derivative Analysis of Gravity Data. Master Thesis (M. Sc.), Faculty of Science, Helwan University, Cairo, Egypt.

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