DBPapers
DOI: 10.5593/sgem2017/22/S09.013

ANALYSIS OF SATELLITE BASED GLOBAL GRAVITY FIELD MODELS ON GNSS/LEVELLING AND REFERENCE GRAVITY STATIONS WORLDWIDE

M. Varga, I. Vidic, T. Basic
Wednesday 13 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7408-02-7 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 22, 99-106 pp, DOI: 10.5593/sgem2017/22/S09.013

ABSTRACT

Satellite based global gravity field models represent Earth’s long-wavelength static or time-variable gravity field. Their progress and development in the recent years has been induced by successful satellite missions, such as GOCE, GRACE and CHAMP and this will continue in the future missions. Resolution and agreement with quality terrestrial data are two attributes that indicate potential usability of each model. Maximum degree of spherical harmonics determines resolution of the satellite-based models. Agreement with terrestrial data is evaluated by comparing different gravity functionals calculated from model with available terrestrial reference data. Thus, spatial and spectral analysis of the quality of satellite based global geopotential models is valuable from several aspects for both creators and users of models.
In this paper, gravity acceleration and geoid undulation computed from the most recent GOCE, GRACE and CHAMP global gravity field models are analysed and compared with control dataset that includes available GNSS/levelling and gravity data worldwide. GNSS/levelling and gravity data are collected, preprocessed and prepared for analysis. Results of comparison show agreement of the global gravity field models with control dataset and indicate spatial and spectral quality in the long-wavelengths of the global gravity field models.

Keywords: global geopotential model, GNSS/levelling, gravimetry, validation