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Dr.-Ing. Loudi Yap  

Visiting Scientist

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Biography

Dr.-Ing. Loudi Yap joined the Institute of Geodesy and Geoinformation (IGG), Astronomical, Physical and mathematical Geodesy Group at the University of Bonn, in February 2024 as a Postdoctoral Research Fellow. Before joining the University of Bonn, Dr.-Ing. YAP Loudi was Researcher and Chief of Research Laboratory in Geodesy at the National Institute of Cartography of Cameroon. He has done extensive work in gravity field and geoid modelling, characterization of groundwater aquifers, digital terrain modelling using satellite, terrestrial and shipborne gravity, and geodetic datasets. His main research interests are at the boundary between various research fields such as Satellite and Physical Geodesy, Geophysics, Remote sensing and Hydrology.  

  • Ph.D. (Thesis Title: Determination of a precise high resolution gravimetric geoid (CGM18) and its implications for the geophysical investigation of lithospheric structures over Cameroon).
  • MSc. (Thesis Title: investigation of Foumban Shear Zone using terrestrial gravity data).

  • Since February 2024 Postdoctoral Research Fellow at the Institute of Geodesy and Geoinformation (IGG), University of Bonn, Germany.

  • 2016 – 2024 Researcher at the National Institute of Cartography of Cameroon (Research Institute)·

  • Oct. 2017 – Nov. 2017 Visiting Researcher at the International Service for the Geoid, Politecnico di Milano, Italy.

  • 2018 – 2024 Part Lecturer at the Department of Land Surveying, National Advanced School of Public Works, Cameroon.

  • 2019 – 2024 Part-time lecturer at the Department of Civil Engineering, Ecole Supérieure Technique LaSalle, Douala (University of Douala, Cameroon).

  • Monitoring and understanding Earth’s water mass budget changes using satellite geodesy.

  • Earth Observation and aquifer mapping using geodetic and geophysical techniques.

  • Gravity field and geoid/quasigeoid modelling for the computation of modern geodetic vertical datum and geophysical applications.

  • Establishment of modern regional/national horizontal reference frames consistent with the International Terrestrial Reference Frame (ITRF).

  • 2016 – 2021 Densification of terrestrial gravimetric network of Cameroon, Sponsored by Government of Cameroon.
  • 2017 – 2022 Computation of local gravimetric geoid model of Cameroon (CGM20), Sponsored by Government of Cameroon.
  • Feb. 2021 Control and Maintenance of geodetic network in the Littoral region of Cameroon Sponsored by National oil and gas Company of Cameroon (SNH).
  • Since 2018 Chief of Research Laboratory in Geodesy at the National Institute of Cartography of Cameroon (Research Institute).
  • Bonn SDG Postdoctoral Fellowship.
  • Best Senior Researcher Award 2023 at the National Institute of Cartography, Cameroon.
  • IAG Travel Award for 14th Internation School of Geoid 2023 in Buenos Aires, Argentina.
  • European Union scholarship (ref." FED/2011/276626) for training 300 Environmental Engineers at the National Advanced School of Public Works of Cameroon in partnership with Universities of Padova and Foscari Venezia (Italy).

  1. Odera, P.A., Apeh, O.I., Yap, L., Tenzer, R., Mphuthi, M.S. (2023) Validation of a Tailored Gravity Field Model for Precise Quasigeoid Modelling over selected Sites in Cameroon and South Africa. Journal of Applied Geodesy, https://doi.org/10.1515/jag-2023-0095.

  2. Kamto, P. G., Yap, L., Nguiya, S., Kandé, L. H., Kamguia, J. (2022) Evaluation of of latest marine gravity field models derived from satellite altimetry over the Gulf of Guinea (Central Africa) with shipborne gravity data  global gravity field models using shipborne free-air gravity anomalies over the Gulf of Guinea, Central Africa. Studia Geophysica et Geodaetica. Doi : 10.1007/s11200-021-0157-y.

  3. Apollinaire, B., Njeudjang, K., Yap, L., Saidou, B., Kamguia, J., Tabod, C. (2022) Interpretation of the locally high gravity anomalies using terrestrial gravity data in Bagodo, North Cameroon. Earth and Planetary Physics. D.o.i 10.26464/epp2022033.

  4. Barzaghi, R., Carrion, D., Kamguia, J., Kande, L.H., Yap, L. Betti, B. (2021) Estimating gravity field and quasi-geoid in Cameroon (CGM20). Journal of African Earth Sciences. https://doi.org/10.1016/j.jafrearsci.2021.104377.

  5. Nkoungou, G. J., Yap, L., Yené Atangana J. Q., Mbida Yem, Nguijol C. G. (2021) Characterization of the basement aquifers over Edéa-Kribi corridor using remote sensing and electrical resistivity method - a case study from Central Africa. Arabian Journal of Geosciences. 14:498. https://doi.org/10.1007/s12517-021-06792-2.

  6. Kamto, P. G., Yap, L., Zanga Amougou, A.., Kandé, L. H., Nguiya, S. and Kamguia, J. (2021) Evaluation of global gravity field models using shipborne free-air gravity anomalies over the Gulf of Guinea, Central Africa. Survey Review. Doi : 10.1080/00396265.2021.1921519.

  7. Kamto, P. G., Willy Lemotio, W., Tokam, A-P. and Yap, L. (2021) Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration. International Journal of Geophysics. https://doi.org/10.1155/2021/5554528.

  8. Kamto, P. G , Mezoue, C. A., Nguiya, S., Kamguia, J. and Yap, L. (2020) Refinement of Bouguer anomalies derived from the EGM2008 model, impact on gravimetric signatures in mountainous region: Case of Cameroon Volcanic Line, Central Africa. Earth and Planetary Physics. 4: 639–650. doi: 10.26464/epp2020065.

  9. Yap, L., Kandé, H. L., Nouayou, R., Kamguia, J., Ngouh, A. N. and Makuate, B. M., (2018) Vertical accuracy evaluation of freely available latest high-resolution (30 m) global digital elevation models over Cameroon (Central Africa) with GPS/leveling ground control points, International Journal of Digital Earth. doi: 10.1080/17538947.2018.1458163.

  10. Yap, L., Nouayou, R., Tchaptchet Tchato, D., Kamguia, J. and Bouba, A., (2018) Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50˚E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies. Open Journal of Geology, 8, 278-297. https://doi.org/10.4236/ojg.2018.83018.

  11. Kande, L. H., Kamguia, J., Yap, L., Foyang, L. (2016) Reference Ellipsoid Parameters of Cameroon from GPS Data. International Journal of Geosciences 7, 1049-1056. Doi:http://dx.doi.org/10.4236/ijg.2016.78079.

  12. Apollinaire, B., Joseph, K., Tabod, T.C., Yap, L., Robert, N., Ludovic, K.H. and Valentin, O. (2017) Subsurface Structural Mapping Using Combined Terrestrial and GRACE data of the Adamawa Plateau (North-Cameroon). International Journal of Géosciences,8,869-887. https://doi.org/10.4236/ijg.2017.87050.

Contact

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Loudi Yap

Dr.-Ing.

+49 228 73-3577

2.008

Nußallee 17

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