Naslov
Modeling of Terrain Effect on Gravity Field Parameters in Croatia

Autori
Hećimović, Željko ; Bašić, Tomislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
IAG Proceedings of the GGSM2004 Symposium, Porto, Portugal, Aug. 30 - Sep. 3, 2004 / - : Springer, 2004

Skup
IAG International Symposium Gravity, Geoid and Space Missions GGSM2004

Mjesto i datum
Porto, Portugal, 30.08.2004. - 03.09.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
DEM; SRTM; DTED; terrain model resolution; RTM effect

Sažetak
Different characteristics of Croatian topography are requesting spatial treatment in local gravity field modeling. CHAMP and GRACE and further GOCE gravity models are defining new standards in gravity field modeling in global (long wave) and regional (middle wave) scale and modeling of short wave, topography influence on gravity field is becoming more and more important. This paper presents the results of several analyses considering influence of terrain models on geoid modeling data. In the analysis are used digital elevation model (DEM) made by digitalization of topographic maps, Shuttle Radar Topography Mission Digital Terrain Elevation Data (SRTM DTED), gravity anomalies, GPS\leveling undulations and deflections of the vertical in Croatian geoid test area. To check influence of different terrain resolutions on residual terrain model (RTM) effects on gravity anomalies and GPS\leveling undulations, the resolutions of referent terrain models 6'x7.6', 10'x15', 20'x30' and 30' x30' are used. The influence considering change of resolution is significant, but regular. Influence of different referent DEM resolutions on remove-restore residual fields is showing the smoothest and smallest field for resolution 20'x30'. Comparison of DEM and SRTM DTED terrain models is made to check their quality. In the test area they have vertical bias of 1 m and standard deviation of differences of 27 m. To judge influence on gravity field considering differences of DEM and SRTM DTED terrain models, RTM effects on gravity anomalies, GPS\leveling undulations and vertical deflections are modeled. Differences caused by DEM and SRTM DTED discrepancies are small, but they should be taken in consideration.

Izvorni jezik
Engleski

Znanstvena područja
Geodezija

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