International Service for the Geoid


Search in ISG Website



Services - Geoid Repository

Regional Models

Croatia (HRG2009)

  Authors: T. Basic, O. Bjelotomic     Created: 2009    Resp: T. Basic  
      Status: PRIVATE    
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.

T. Basic, O. Bjelotomic (2014). HRG2009: New High Resolution Geoid Model for Croatia. In: U. Marti (ed.), Gravity, Geoid and Height Systems, IAG Symposia Series, vol. 141, pp. 187-191, Springer Verlag.