INTERNATIONAL HYDROGRAPHIC REVIEW 
MAY 2020 
82 
els and GNSS-based height determination. E-mail: joachim.schwabe@bkg.bund.de 
Jonas Agren is associate professor in geodesy and senior lecturer at the University of Gävle in 
Sweden. He is also part time senior geodesist at Lantmäteriet, the Swedish mapping, cadastral 
and land registration authority. He received his PhD degree in physical geodesy at the Royal Insti 
tute of Technology in Stockholm (KTH) in 2004. Since then he has worked with geoid modelling, 
height systems and gravimetry in Sweden and the Nordic/Baltic countries. He was the chairman 
of the working group on geoid and height systems of the Nordic Geodetic Commission (NKG) be 
tween 2010 and 2018, and leader of FAMOS activity 2 (Harmonising vertical datum/improving 
vessel navigation for the future) between 2015 and 2018.E-mail: jonas.agren@hig.se 
Gunter Liebsch is head of the unit “Integrated Spatial Referencing” at the German Federal 
Agency for Cartography and Geodesy (BKG), dealing with the German and the European height 
systems, GREF (GNSS reference station network in Germany) and the national quasigeoid model 
GCG. He graduated as a geodesist from the Technische Universität Dresden (TUD) in 1990 and 
finalized his PhD thesis on the processing and use of water level time series for geodetic and geo 
dynamic applications in the Baltic Sea in 1997.E-mail: gunter.liebsch@bkg.bund.de 
Patrick Westfeld is head of German Hydrographic Office's R&D section “Geodetic- 
hydrographic Techniques and Systems” at the Federal Maritime and Hydrographic Agency (BSH). 
His activities range from conceptual issues pertaining to hydroacoustic and imaging sensor tech 
nologies, sensor integration and modeling, algorithmic development and software implementation 
up to and including application-specific implementation and practical transfer in the production en 
vironment. After graduating as a geodesist from the Technische Universität Dresden (TUD) in 
2005, he conducted research in the fields of photogrammetry and laserscanning and finalized his 
PhD degree in 2012 on geometric-stochastic modeling and motion analysis. 
E-mail: patrick.westfeld@bsh.de 
Thomas Hammarklint is the Chairman of the BSHC Chart Datum Working Group and works at 
the Swedish Maritime Administration (SMA). He graduated as a physical oceanographer from the 
Gothenburg University in 2002. He is the Swedish representative and expert in several working 
groups and programs related to water levels, data exchange and reference levels, such as IOC 
Global Sea Level Observing System (GLOSS), IHO Tidal Water Level and Current Working 
Group (TWCWG), NSHC Tidal Working Group (TWG) and Baltic Sea Operational Oceanographic 
System (BOOS). E-mail: thomas.hammarklint@sjofartsverket.se 
Jyrki Mononen is an expert at the Finnish Transport and Communications Agency Traficom in 
the Hydrographic Survey Services. He is the ordinary secretary of the BSHC Chart Datum 
Working Group. He graduated as MSc in land surveying an the Helsinki University of Technology 
in 1995. He has been involved in chart datum definitions in Finnish nautical charts and 
navigational information, national specifications for hydrographic surveying and procurement of 
hydrographic surveys. He is Finnish representative in IHO Tides, Water Level and Currents 
Working Group and Data Quality Working Group. E-e-mail: jyrki.mononen@traficom.fi 
Ole B. Andersen is professor in marine geodesy and head of the hydrosphere group at DTU 
Space at the Technical University of Denmark which is the national space institute of Denmark. 
His activity in the working group has been to provide satellite-based long-term estimates of mean