Dr.-Ing.  Thomas Grombein

Dr.-Ing. Thomas Grombein

 

Academic CV

Since 05/2023 Senior Scientist, Karlsruhe Institute of Technology (KIT), Geodetic Institute (GIK)
08/2019  – 04/2023 Advanced Postdoc, University of Bern, Astronomical Institutet (AIUB)
01/2010  – 07/2019 Research Associate (Ph.D. student / Postdoc), KIT, Geodetic Institute
10/2016 Doctor of Engineering (Dr.-Ing.) in Geodesy, KIT
12/2009 Diploma Degree (Dipl.-Ing.) in Geodesy and Geoinformatics, KIT

 

Research Interests

  • GNSS-based orbit and gravity field determination
  • Gravity field recovery with nano-satellites
  • Satellite gravimetry (GOCE, GRACE/-FO)
  • Gravity forward modelling (Tesseroids)

 

Research Projects

AI Fast Track: AI-Enhanced Gravity Field Modelling Using Physics-Informed Neural Networks, National High Performance Computing Center at KIT (NHR@KIT)
Spire-Project: Precise Orbit Determination of the Spire Satellite Constellation for Geodetic, Geophysical, and Ionospheric Applications, European Space Agency (ESA), Announcement of Opportunity (AO) project
SPACE TIE: Unifying the three pillars of Geodesy using space ties, European Research Council (ERC)
GOCE Reprocessing Campaign, European Space Agency (ESA)
Methodological and numerical investigations for the establishment of a unified global vertical datum, German Research Foundatio
REAL-GOCE: Realdatenanalyse GOCE, Geotechnologien, German Federal Ministry of Education and Research

 

Published Gravity Field Models

Rock-Water-Ice Models

Grombein, T.; Seitz, K.; Heck, B. (2015). Rock-Water-Ice topographic gravity field model 2015 (RWI 2015 model). doi:10.5880/ICGEM.2015.001
Grombein, T.; Seitz, K.; Heck, B. (2014). Rock-Water-Ice topographic-isostatic gravity field model 2012 (RWI 2012 model). doi:10.5880/ICGEM.2014.001

 

Teaching Activities

B.Sc. Geodesy and Geoinformatics

  • Adjustment Theory and Statistics (E)
  • Figure and Gravity Field of the Earth (L+E, Gravimetry)
  • Seminar Geodesy and Geoinformatics (Supervision)

B.Sc. Geophysics, B.Sc. Physics

  • Geophysical Field Exercise (Gravimetry)

M.Sc. Geodesy and Geoinformatics

  • Gravity Field Missions (L+E)
  • Time-variable Gravity Field Recovery (L+E)
  • Project Gravity Field Recovery (E)

M.Sc. Remote Sensing and Geoinformatics

  • Fundamentals of Environmental Geodesy Part A (L+E)
  • Time-variable Gravity Field Recovery (L+E)
  • Project Gravity Field Recovery (E)

Teaching unitl 07/2019

  • Geometric Models of Geodesy (E)
  • Satellite Geodesy (E)
  • Positioning (E)
  • Geodetic Astronomy (E)

Baden-Württemberg Certificate for University Didactics (10/2018)

 

Institute Responsibilities

  • Since 08/2026: Head of the Gravity Field Working Group   
  • Since 01/2025: GIK mid-level representative
  • Since 02/2024: Finance / Administration Black Forest Observatory (BFO, Schiltach)
  • Since 02/2024: Head of the gravimetry laboratory

 

Participation in Committees and Commissions

 

Memberships

 

Publications


Abd-Elmotaal, H. A.; Kühtreiber, N.; Seitz, K.; Grombein, T.; Heck, B.; Kutterer, H. (2026). AFRgeo2025: The New Geoid Model for Africa Implementing Moho Information. Proceedings of the 2025 Scientific Assembly of the International Association of Geodesy, Springer-Verlag. doi:10.1007/1345_2026_395Full textFull text of the publication as PDF document
Abd-Elmotaal, H. A.; Kühtreiber, N.; Seitz, K.; Grombein, T.; Heck, B.; Kutterer, H. (2026). The AFRGDB_V3.1 updated gravity database for Africa implementing Moho information. Survey Review, 1–14. doi:10.1080/00396265.2026.2664266
Abd-Elmotaal, H. A.; Seitz, K.; Kuehtreiber, N.; Grombein, T.; Heck, B.; Kutterer, H. (2025). A Moho Model for Africa. Journal of Advanced Engineering Trends, 44 (2), 33– 38. doi:10.21608/jaet.2025.372553.1362
Grombein, T. (2025). On the contribution of the Spire CubeSat constellation for gravity field recovery. Astronomical Seminar, University of Bern (2025), Bern, Switzerland, April 14, 2025.
Abd-Elmotaal, H.; Kühtreiber, N.; Seitz, K.; Grombein, T.; Heck, B.; Kutterer, H. (2025). AFRgeo2025: Geoid model for Africa implementing Moho information. Scientific Assembly of the International Association of Geodesy (IAG 2025), Rimini, Italy, September 1–5, 2025.
Gschwind, C.; Grombein, T.; Seitz, K.; Kutterer, H. (2025). Combination of Swarm monthly solutions (derived from different approaches). Scientific Assembly of the International Association of Geodesy (IAG 2025), Rimini, Italy, September 1–5, 2025.
Grombein, T.; Miller, A.; Lasser, M.; Arnold, D.; Jäggi, A. (2025). How orbit data of nano-satellites can contribute to study the Earth’s gravity field. COSPAR Scientific Symposium (2025), Nicosia, Cyprus, November 3–7, 2025. doi:10.5445/IR/1000187824Full textFull text of the publication as PDF document
Abd-Elmotaal, H. A.; Seitz, K.; Kühtreiber, N.; Grombein, T.; Heck, B.; Kutterer, H. (2025). Use of laterally varying crustal density in gravity interpolation at large data gaps: experiment for the continent Africa. Studia Geophysica et Geodaetica, 69 (2), 177–194. doi:10.1007/s11200-025-0905-5
Grombein, T.; Lasser, M.; Miller, A.; Arnold, D.; Jäggi, A. (2025). Joint orbit and gravity field determination from GPS carrier phase observations of Spire CubeSats. IAG Scientific Assembly (2025), Rimini, Italy, September 1–5, 2025. doi:10.5445/IR/1000185057Full textFull text of the publication as PDF document
Liu, R.; Kuper, P.; Grombein, T.; Naab, C.; Al-Doori, M.; Breunig, M. (2025). Towards Integrated Data Management and Analysis for Spatio-Temporal Digital Terrain Models. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. X-G-2025, 543–550, International Society for Photogrammetry and Remote Sensing (ISPRS). doi:10.5194/isprs-annals-X-G-2025-543-2025Full textFull text of the publication as PDF document
Grombein, T.; Arnold, D.; Lasser, M.; Jäggi, A. (2024, September 27). Gravity field recovery with nano-satellites of the Spire constellation. Frontiers of Geodetic Science (FroGS 2024), Stuttgart, Germany, September 26–27, 2024. doi:10.5445/IR/1000174614Full textFull text of the publication as PDF document
Gschwind, C.; Grombein, T.; Seitz, K.; Kutterer, H. (2024). On the use of kinematic orbits for time-variable gravity field determination. Frontiers of Geodetic Science (FroGS 2024), Stuttgart, Germany, September 26–27, 2024.
Jäggi, A.; Arnold, D.; Mao, X.; Kobel, C.; Miller, A.; Kalarus, M.; Peter, H.; Grombein, T.; Schreiter, L. (2024). Precise Orbit Determination of the Spire Satellite Constellation for geodetic, geophysical, and ionospheric applications. AGU Fall Meeting (2024), Washington, DC, USA, December 9–13, 2024.
Jäggi, A.; Arnold, D.; Mao, X.; Kobel, C.; Miller, A.; Kalarus, M.; Peter, H.; Grombein, T.; Schreiter, L. (2024). Precise Orbit Determination of the Spire Satellite Constellation for Geodetic, Geophysical, and Ionospheric Applications. 45th COSPAR Scientific Assembly (2024), Busan, South Korea, July 13–21, 2024.
Arnold, D.; Grombein, T.; Schreiter, L.; Sterken, V.; Jäggi, A. (2023). Reprocessed precise science orbits and gravity field recovery for the entire GOCE mission. Journal of Geodesy, 97 (7), Art.-Nr.: 67. doi:10.1007/s00190-023-01752-yFull textFull text of the publication as PDF document
Grombein, T.; Arnold, D.; Kobel, C.; Lasser, M.; Jäggi, A. (2023). Gravity field recovery based on GPS data of CubeSats from the Spire constellation. 28th General Assembly of IUGG (2023), Berlin, Germany, July 11–20, 2023. doi:10.57757/IUGG23-3392Full textFull text of the publication as PDF document
Grombein, T.; Lasser, M.; Arnold, D.; Meyer, U.; Jäggi, A. (2022). Assessment of gravity field models derived from Sentinel GPS data. European Geosciences Union General Assembly (EGU 2022), Vienna, Austria, May 23–27, 2022. doi:10.48350/170573Full textFull text of the publication as PDF document
Grombein, T.; Lasser, M.; Arnold, D.; Meyer, U.; Jäggi, A. (2022). Combined gravity field time series derived from Swarm and Sentinel GPS data. IAG Symposium Gravity, Geoid and Height Systems (2022), Austin, Texas, USA, September 12–14, 2022. doi:10.48350/173822
Grombein, T.; Lasser, M.; Arnold, D.; Meyer, U.; Jäggi, A. (2022). Determination and Combination of Monthly Gravity Field Time Series from Kinematic Orbits of GRACE, GRACE-FO and Swarm. Geodesy for a Sustainable Earth – Proceedings of the 2021 Scientific Assembly of the International Association of Geodesy, Beijing, China, June 28 – July 2, 2021. Ed.: J. Freymueller, 191–201, Springer International Publishing. doi:10.1007/1345_2022_163
Yang, Y.; Ferreira, V.; Seitz, K.; Grombein, T.; Yong, B.; Heck, B. (2022). Assessment of point-mass solutions for recovering water mass variations from satellite gravimetry. Acta Geodaetica et Geophysica, 57 (1), 85–106. doi:10.1007/s40328-021-00369-x
Grombein, T.; Lasser, M.; Arnold, D.; Meyer, U.; Jäggi, A. (2021). Time-variable gravity field recovery from kinematic positions of Low Earth Orbiting satellites. European Geosciences Union General Assembly (EGU 2021), Online, April 19–30, 2021. doi:10.48350/156175Full textFull text of the publication as PDF document
Grombein, T.; Lasser, M.; Arnold, D.; Meyer, U.; Jäggi, A. (2021). On the combination of gravity field time series derived from kinematic positions of Low Earth Orbiting satellites. Scientific Assembly of the International Association of Geodesy (IAG 2021), Beijing, China, June 28–July 2, 2021. doi:10.48350/166406
Grombein, T.; Arnold, D.; Jäggi, A. (2021). Time-variable gravity field recovery from reprocessed GOCE precise science orbits. 43th COSPAR Scientific Assembly (2021), Sydney, Australia, January 28–February 4, 2021. doi:10.48350/152967
Ferreira, V. G.; Yong, B.; Seitz, K.; Heck, B.; Grombein, T. (2020). Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica. Remote sensing, 12 (19), Art.-Nr. 3197. doi:10.3390/rs12193197Full textFull text of the publication as PDF document
Marotta, A. M.; Seitz, K.; Barzaghi, R.; Grombein, T.; Heck, B. (2019). Comparison of two different approaches for computing the gravitational effect of a tesseroid. Studia geophysica et geodaetica, 63 (3), 321–344. doi:10.1007/s11200-018-0454-2
Grombein, T.; Arnold, D.; Jäggi, A. (2019, April). GPS-based gravity field recovery from reprocessed GOCE precise science orbits. European Geosciences Union General Assembly (EGU 2019), Vienna, Austria, April 7–12, 2019. doi:10.5445/IR/1000094594Full textFull text of the publication as PDF document
Seitz, K.; Grombein, T.; Kutterer, H. (2019). Schwereanomalien in Baden-Württemberg. ZfV, 144 (4), 260–275. doi:10.12902/zfv-0267-2019
Arnold, D.; Grombein, T.; Schreiter, L.; Sterken, V.; Jäggi, A. (2019). Reprocessing of GOCE Precise Science Orbits. ESA Living Planet Symposium (2019), Milan, Italy, May 13–17, 2019. doi:10.7892/BORIS.143216
Grombein, T.; Mayer, M. (2018). Studentische GNSS-Konferenz als Beitrag zur Forschungsorientierung im MSc-Studiengang Geodäsie und Geoinformatik. Forum für Lehre (2018), Karlsruhe, Germany, November 6, 2018.
Ferreira, V.; Grombein, T.; Seitz, K.; Heck, B. (2018). On the equal-area spherical panels to estimate the continental water-mass variations from GRACE measurements. International Symposium on Gravity, Geoid and Height Systems (GGHS 2018), Copenhagen, Denmark, September 17–21, 2018.
Heck, A.; Seitz, K.; Grombein, T.; Mayer, M.; Stövhase, J.-M.; Sumaya, H.; Wampach, M.; Westerhaus, M.; Dalheimer, L.; Senger, P. (Eds.). (2018). (Schw)Ehre, wem (Schw)Ehre gebührt : Festschrift zur Verabschiedung von Prof. Dr.-Ing. Dr. h.c. Bernhard Heck. KIT Scientific Publishing. doi:10.5445/KSP/1000080324Full textFull text of the publication as PDF document
Seitz, K.; Grombein, T. (2018). Die Karlsruher Tesseroidmethode. (Schw)Ehre, wem (Schw)Ehre gebührt : Festschrift zur Verabschiedung von Prof. Dr.-Ing. Dr. h.c. Bernhard Heck. Hrsg.: A. Heck, 255–263, KIT Scientific Publishing. doi:10.5445/KSP/1000080248Full textFull text of the publication as PDF document
Grombein, T.; Seitz, K. (2018). Zur Realisierung eines einheitlichen globalen Höhendatums. (Schw)Ehre, wem (Schw)Ehre gebührt : Festschrift zur Verabschiedung von Prof. Dr.-Ing. Dr. h.c. Bernhard Heck. Hrsg.: A. Heck, 101–108, KIT Scientific Publishing. doi:10.5445/IR/1000080217Full textFull text of the publication as PDF document
Porz, L.; Grombein, T.; Seitz, K.; Heck, B.; Wenzel, F. (2017, April). Height system unification based on the Fixed Geodetic Boundary Value Problem with limited availability of gravity data. General Assembly of the European Geosciences Union 2017. Vienna, Austria, 23.–28. Apr. 2017.
Grombein, T.; Porz, L.; Seitz, K.; Heck, B. (2017). On the practical realization of the fixed GBVP approach for a unification of height systems in Central Europe. IAG-IASPEI Joint Scientific Assembly 2017. Kobe, Japan, 30. Juli–4. Aug. 2017.
Grombein, T.; Seitz, K.; Heck, B. (2016, September). On the effect of topography-implied gravity signals for satellite-based height system unification. International Symposium on Gravity, Geoid and Height Systems (GGHS 2016), Thessaloniki, Greece, September 19–23, 2016.
Fereria, V.; Heck, B.; Seitz, K.; Grombein, T. (2016). Using tesseroid mascons to improve the estimations of water-mass variations with GRACE. European Geosciences Union General Assembly (EGU 2016), Vienna, Austria, April 17–22, 2016.
Heck, B.; Seitz, K.; Grombein, T. (2015, September). Lösung des Geodätischen Randwertproblems mittels analytischer Fortsetzung und sphärischer Integralformeln. Geodätische Woche (2015), Stuttgart, Germany, September 15–17, 2015.
Heck, B.; Seitz, K.; Grombein, T. (2015). A numerical study of up- and downward continuation effects in the solution of the Geodetic Boundary Value Problem. 26th General Assembly of the International Union of Geodesy and Geophysics (IUGG 2015), Prague, Czechia, June 22–July 2, 2015.
Grombein, T.; Seitz, K.; Heck, B. (2015). RWI_TOPO_2015: An update of the Rock-Water-Ice topographic gravity field model of the Earth. 26th General Assembly of the International Union of Geodesy and Geophysics (IUGG 2015), Prague, Czechia, June 22–July 2, 2015.
Grombein, T.; Seitz, K.; Heck, B. (2015). Height System Unification Based on the Fixed GBVP Approach. IAG 150 Years : IAG Scientific Assembly in Postdam, Germany, 1–6 September, 2013. Ed.: C. Rizos, 305–311, Springer-Verlag. doi:10.1007/1345_2015_104
Müssle, M.; Heck, B.; Seitz, K.; Grombein, T. (2014). On the effect of planar approximation in the Geodetic Boundary Value Problem. Studia Geophysica et Geodaetica, 58 (4), 536–555. doi:10.1007/s11200-013-0249-4
Grombein, T.; Luo, X.; Seitz, K.; Heck, B. (2014). A Wavelet-Based Assessment of Topographic-Isostatic Reductions for GOCE Gravity Gradients. Surveys in Geophysics, 35 (4), 959–982. doi:10.1007/s10712-014-9283-1
Seitz, K.; Grombein, T.; Heck, B. (2014, March). Schwereanomalien und Schwerestörungen in der Region Oberrheingraben. 74. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG 2014), Karlsruhe, Germany, March 10–13, 2014.
Grombein, T.; Seitz, K.; Heck, B. (2014). Numerische Untersuchungen zur Realisierung eines einheitlichen globalen Höhendatums. 74. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG 2014), Karlsruhe, Germany, March 10–13, 2014.
Grombein, T.; Seitz, K.; Heck, B. (2014). Evaluation of the latest GOCE gravity field models by using GNSS/leveling data in Australia, Brazil, and Germany. 5th International GOCE User Workshop (2014), Paris, France, April 27–May 2, 2014.
Oliveira, M.; Fuchs, M.; Grombein, T.; Bouman, J.; Haberkorn, C. (2014). GOCE gravity gradient analysis in the West Antarctica using a voxel based approach. European Geosciences Union General Assembly (EGU 2014), Vienna, Austria, April 27–May 2, 2014.
Grombein, T.; Seitz, K.; Heck, B. (2014). Incorporating Topographic-Isostatic Information into GOCE Gravity Gradient Processing. Observation of the System Earth from Space. Ed.: F. Flechtner, 95–101, Springer-Verlag. doi:10.1007/978-3-642-32135-1_12
Grombein, T.; Seitz, K.; Heck, B. (2014). Topographic–Isostatic Reduction of GOCE Gravity Gradients. Earth on the Edge. Ed.: C. Rizos, 349–356, Springer-Verlag. doi:10.1007/978-3-642-37222-3_46
Grombein, T.; Seitz, K.; Heck, B. (2013). On the use of the fixed Geodetic Boundary Value Problem for global height system unification. Scientific Assembly of the International Association of Geodesy (IAG 2013), Potsdam, Germany, September 1–6, 2013.
Grombein, T.; Seitz, K.; Heck, B. (2013). Unification of continental height systems based on the fixed Geodetic Boundary Value Problem – a case study in spherical approximation. AGU Fall Meeting (2013), San Francisco, CA, USA, December 9–13, 2013.
Grombein, T.; Seitz, K.; Heck, B. (2013). Assessment of RTM-implied gravity signals - a case study in Australia, Brazil, and Germany. Scientific Assembly of the International Association of Geodesy (IAG 2013), Potsdam, Germany, September 1–6, 2013.
Müßle, M.; Seitz, K.; Heck, B.; Grombein, T. (2013). Numerical investigation of the effect of planar approximation in the Geodetic Boundary Value Problem. Scientific Assembly of the International Association of Geodesy (IAG 2013), Potsdam, Germany, September 1–6, 2013.
Heck, B.; Müßle, M.; Seitz, K.; Grombein, T. (2013). On the effect of planar approximation in the Geodetic Boundary Value Problem. European Geosciences Union General Assembly (EGU 2013), Vienna, Austria, April 7–12, 2013.
Müßle, M.; Seitz, K.; Grombein, T.; Heck, B. (2012, October). Numerische Untersuchungen zur Genauigkeit der Tesseroidformeln für die Massenmodellierung im Nahbereich. Geodätische Woche (2012), Hanover, Germany, October 9–11, 2012.
Grombein, T.; Seitz, K.; Awange, J. L.; Heck, B. (2012, April). Detection of hydrological mass variations by means of an inverse tesseroid approach. European Geosciences Union General Assembly (EGU 2012), Vienna, Austria, April 22–27, 2012. doi:10.5445/IR/1000162814Full textFull text of the publication as PDF document
Grombein, T.; Seitz, K.; Heck, B. (2012). Estimation of height system biases by means of EGM08 and GOCE-derived geopotential models. International Symposium on Gravity, Geoid and Height Systems (GGHS 2012), Venice, Italy, October 9–12, 2012.
Grombein, T.; Seitz, K.; Heck, B. (2012). The Rock-Water-Ice topographic-isostatic gravity field model up to d/o 1800. International Symposium on Gravity, Geoid and Height Systems (GGHS 2012), Venice, Italy, October 9–12, 2012.
Grombein, T.; Seitz, K.; Heck, B. (2011). Topographic-isostatic reduction of GOCE gravity gradients. 25th General Assembly of the International Union of Geodesy and Geophysics (IUGG 2011), Melbourne, Australia, June 28–July 7, 2011.
Grombein, T.; Seitz, K.; Heck, B. (2011). Smoothing GOCE gravity gradients by means of topographic-isostatic reductions. 4th International GOCE User Workshop (2011), Munich, Germany, March 31–April 1, 2011.
Grombein, T.; Seitz, K.; Heck, B. (2010, October). Einfluss von Dichteannahmen auf die Modellierung topographischer Effekte. Geodätische Woche (2010), Cologne, Germany, October 5–7, 2010.
Grombein, T.; Seitz, K.; Heck, B. (2010). Spherical and ellipsoidal arrangement of the topography and its impact on gravity gradients in the GOCE mission. European Geosciences Union General Assembly (EGU 2010), Vienna, Austria, May 2–7, 2010.
Grombein, T.; Seitz, K.; Heck, B. (2010). Modelling topographic effects in GOCE gravity gradients. Geotechnologien: science report, 17, 84–93. doi:10.2312/GFZ.GT.17.13
Grombein, T.; Seitz, K. (2010). Die Stokes-Funktion und modifizierte Kernfunktionen. Vernetzt und ausgeglichen : Festschrift zur Verabschiedung von Prof. Dr.-Ing. habil. Dr.-Ing. e.h. Günter Schmitt. Hrsg.: K. Zippelt, 89–100, KIT Scientific Publishing.
Grombein, T.; Seitz, K.; Heck, B. (2009). Optimierte Tesseroidformeln zur Berechung topographischer Effekte auf den Gradiententensor. Geodätische Woche 2009 : 22. - 24. September 2009, Messe Karlsruhe, Rheinstetten im Rahmen der INTERGEO – Kongress und Fachmesse für Geodäsie, Geoinformation und Landmanagement. Abstracts. Hrsg.: B. Heck, 23, Universitätsverlag Karlsruhe.
Grombein, T. (2008). Studie zur Modifikation der Stokesfunktion. student research project.
Grombein, T.; Seitz, K.; Heck, B. (2008). Modifikation der Stokesfunktion bei regionaler Quasigeoidbestimmung. Geodätische Woche (2008), Bremen, Germany, September 30–October 2, 2008. Full textFull text of the publication as PDF document