DBPapers
DOI: 10.5593/SGEM2014/B22/S9.052

QUASIGEOID FITTING TO THE GNSS/LEVELLING BENCHMARKS IN IASI CITY AREA

C. Chirila, E. Valeria Oniga, P.Daniel Dumitru
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-11-7 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 2, 411-418 pp

ABSTRACT
Adoption in Romania of the ETRS89 European datum implies the need for a coordinate transformation model relative to local datum, which has the characteristics of uniqueness, simplicity and accuracy. When the application relates to the 3D integration of the spatial data, the main problem consists in the introduction of precise gravity related heights in the local system. This can be resolved by correcting the quasigeoid surface resulting from a regional gravimetric model, in relation to data from GNSS and levelling measurements. The case study uses the corrections provided by the EGG97 European quasigeoid model with applications in Iasi city area, Romania. A comparative study will be performed using only interpolation or combined analytical and interpolation methods in order to obtain a precise local quasigeoid model.

Keywords: quasigeoid, interpolation, height, accuracy, transformation.