Croatia newest high resolution geoid model is HRG2009 developed by Tomislav Basic & Olga Bjelotomic, both from Faculty of Geodesy, Zagreb University. A publication describing development of HRG2009 can be found in book: Gravity, Geoid and Height Systems, Proceedings of the IAG Symposium GGHS2012, October 9–12, 2012, Venice, Italy.
The paper can be download here - IAG Vol 141 dan IAG Venice.
HRG2009 is a gravimetric geoid model for Croatia. It covers the entire territory of Croatia ranging between 42° and 46.6° in latitude, and between 13.0° and 19.5° in longitude, with a grid resolution of 30"x45". It is referred to the GRS80 ellipsoid in the Croatian HTRS96 datum. Data from terrestrial gravimetry and from satellite altimetry for the area of the Adriatic Sea were used. The model was computed by least-squares collocation in the framework of a remove-restore procedure. In particular the long-wavelenght part is derived from the EGM2008 global geopotential model, while the short-wavelenght part is mainly taken from a digital terrain model of 4"x5" obtained from 3"x3" SRTM data. The accuracy assessment of the HRG2009 model was performed by comparing it with 59 GNSS/levelling control stations, which were not used in calculations. The resulting differences have a standard deviation of 3.5 cm over the whole computation area, thus significantly improving the standard deviation of 11.4 cm obtained with the previous national geoid model HRG2000.
Source - igs.
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