Naslov
Latest results from the Geomed2 project: Geoid and DOT in the Mediterranean area

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

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, kratko priopćenje, znanstveni

Izvornik
25YPRA Programme Abstracts / - , 2018

Skup
25 Years of Progress in Radar Altimetry Symposium

Mjesto i datum
Ponta Delgada, Portugal, 24.09.2018. - 29.09.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
GEOMED-2 ; geoid ;
(Mediterranean Sea ; geoid ; RTM ; topographic effects ; aliasing ; geoid ; FFT ; LSC ; FastCol ; KTH ; Geomed2)

Sažetak
The main aim of the Geomed2 project was the estimation of the best possible geoid approximation, given the available marine gravity data, for the wider Mediterranean area, i.e. in the area bounded between 30 <phi < 48 -10 < lambda < 40, on a 2’ 2’ geographical grid. For the geoid estimation, all available shipborne gravity data have been collected, edited, homogenized and used to derive the most homogeneous possible dataset in order to devise a gravimetric only geoid model. In that respect, special attention has been paid to the data debiasing, where both area-wise and track-wise methods have been employed. The geoid estimation was based on the well-known remove-compute-restore method, employing different approaches for the actual geoid modeling. The available gravity data have been gridded on a regular 2’ 2’ grid in the computation area employing ordinary kriging, serving both as input to the geoid estimation methodologies and as a project deliverable to be disseminated as a new approximation of the gravity field over the Mediterranean. When required, the low frequency components of the gravity field have been modeled using EIGEN-6c4 to d/o 1000 and different methods for RTC reduction have been tested. The estimated geoids have then been compared with GPS leveling data and an independent oceanographic geoid. We present the advantages and pitfalls of each processing step, discussing the possible sources of noise and errors, while finally devising a final optimal estimate to be used for geodetic and oceanographic applications.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika, Geodezija

POVEZANOST RADA