He received B.Sc. in Land Surveying Engineering (2000), and then the M.Sc. degree in Geodesy from K.N.Toosi University,Tehran, Iran in 2002, the Ph.D. degree from the Royal Institute of Technology (KTH), Stockholm, Sweden, in 2011. He promoted to Docent in Geodesy (2013). He is working as Professor at University of Gävle and Senior Researcher at KTH.
He is member of editorial board in Journal of Geodetic Science since 2013.
Except his academic activities he was project manager of railway and highway studies in different phases of construction of the projects in Metra Consulting Engineering Co. from 2001-2007 in Tehran-Iran.
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Long-term monitoring of temporal geoid change is important for updating the static
geoid model. The change of the geoid with time is caused by the redistribution of
masses within the Earth. Generally it can be observed by repeated geodetic observations such as gravimetric observations, including space gravity and gradiometry, and from geodetic height observed by precise levelling and/or GNSS observations (cf. Sjöberg and Bagherbandi 2017, Chapter 8).
In order to obtain the secular trend of the geoid change a long observation period should be considered. The plot in the following uses all monthly GRACE data sets between 2002 and 2016.