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The GEOMED2 project: Multi-resolution aspects and aliasing in topographic effects for geoid and gravity determination


Barzaghi, Ricardo; Vergos, Georgios S.; Albertella, Alberta; Carrion, Daniela; Cazzaniga, Noemi; Tziavos, Ilias N.; Grigoriadis, Vassilios; Natsiopoulos, Dimitrios; Bruinsma, Sean; Bonvalot, Sylvain et al.
The GEOMED2 project: Multi-resolution aspects and aliasing in topographic effects for geoid and gravity determination // IAG-IASPEI 2017 Online abstracts
Kober, Japan, 2017. (poster, međunarodna recenzija, sažetak, znanstveni)


Naslov
The GEOMED2 project: Multi-resolution aspects and aliasing in topographic effects for geoid and gravity determination

Autori
Barzaghi, Ricardo ; Vergos, Georgios S. ; Albertella, Alberta ; Carrion, Daniela ; Cazzaniga, Noemi ; Tziavos, Ilias N. ; Grigoriadis, Vassilios ; Natsiopoulos, Dimitrios ; Bruinsma, Sean ; Bonvalot, Sylvain ; Seoane, Lucia ; Reinquin, Frank ; Lequentrec-Lalancette, M-F ; Salaun, Corinne ; Bonnefond, Pascal ; Knudsen, P. ; Andersen, Ole ; Simav, Mehmet ; Yildiz, Hasan ; Bašić, Tomislav ; Varga, Matej ; Bjelotomić, Olga ; Gil, A.J.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
IAG-IASPEI 2017 Online abstracts / - , 2017

Skup
IAG-IASPEI Joint Scientific Assemblies 2017

Mjesto i datum
Kober, Japan, 30.07-04.08.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Mediterranean Sea ; geoid ; RTM ; topographic effects ; aliasing ; geoid ; FFT ; LSC ; FastCol ; KTH ; Geomed2

Sažetak
One of the key aspects of the GEOMED2 project is the determination of a high-accuracy and high-resolution geoid model for the Mediterranean Sea along with the generation of gravity grids for various types of gravity anomalies like free-air, complete Bouguer, isostatic, etc. A crucial point in both geoid determination and gravity reductions, using the remove-compute-restore method, is the proper modelling of the topography/bathymetry effects on the available gravity anomalies. When estimating the high-frequency content of the gravity field spectrum the robustness and rigorousness of the determined topographic effects relies on both proper theoretical treatment and the soundness of the Digital Terrain and Bathymetry Model (DTM/DBM) used. Over land areas, the latest SRTM-based DTMs offer high-accuracy and high-resolution information on the topographic variations, in the sense that they properly manage to model the high-frequency contributions of the topographic masses. Over marine regions the situation is quite different, since the resolution of the DBMs available is not capable to remove the high-frequencies present in shipborne marine gravity data. Moreover, marine gravity data themselves do not have in many cases the necessary spatial resolution to rigorously model the high-frequencies depicted in the DBM. The main focus of the present work is on treating the aforementioned problems, i.e., to investigate and properly determine topographic effects over both land and marine areas to efficiently reduce land and marine gravity data towards geoid determination. Additionally, aliasing effects on the estimated topographic effects are investigated and the corresponding errors introduced in gravity anomalies and geoid heights are determined. Then, the DTM/DBM combination that provides the overall best results, in terms of the smoothness of the residual gravity anomalies, is outlined along with the final topographically corrected gravity anomalies and geoid indirect effects.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Geodezija



POVEZANOST RADA


Ustanove
Geodetski fakultet, Zagreb