Naslov
Preliminary works on Creation of the New Croatian Geoid Model HRG2009

Autori
Grgić, Ilija ; Lučić, Maro ; Repanić, Marija ; Bjelotomić, Olga ; Liker, Mihajla ; Markovinović, Danko ; Bašić, Tomislav

Izvornik
Bollettino di geodesia e scienze affini (0006-6710) LXIX (2010), 2-3; 165-177

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
HRG2000; HRG2009; GNSS/levelling points; geoid model

Sažetak
The official Croatian geoid model HRG2000 was developed as a surface for conversion of GNSS-derived ellipsoidal heights into orthometric heights. CROatian POsitionig System (CROPOS), based on 30 permanently working GNSS reference station, had been established last year. Since HRG2000 geoid model characterizes some weaknesses regarding absolute orientation we have used CROPOS service to define new points which will be a base for creation of the new Croatian geiod model HRG2009. For this purpose over the whole Croatian territory more than 500 GNSS/levelling geodetic points were stabilized and measured according to the approximate raster of 10x10km. All measured points were connected to the nearest benchmarks of the new Croatian vertical datum by precise levelling. The GNSS/Levelling survey provides reliable geoid undulation but only at the points where the survey is made. Therefore for the construction of an accurate HRG2009 geoid model afterwards the gravimetric geoid model, which should be calculated from all new measured gravity points and old available gravity data, will be fitted to the geoid undulation data from a GNSS/levelling survey. The recently determined geoid undulation calculated from GNSS/Levelling data at the measured geodetic points were analyzed additionally in relation to the geoid undulation from the geoid model HRG2000. The range of geoid undulation and orthometric height differences at measured points between old and new geoid model shows an important progress concerning quality in definition of heights for the Republic of Croatia.

Izvorni jezik
Engleski

Znanstvena područja
Geodezija

POVEZANOST RADA