Spectral and Spatial Assessment of recent Satellite-based Gravity Field Models
19/09/2016 | 17:15 | Session 2: Global gravity field modelling
Author(s): Konstantinos Patlakis and Dimitrios Tsoulis
Konstantinos Patlakis and Dimitrios Tsoulis
In the course of the last fifteen years from the release of the first publicly available CHAMP-only gravity field model, more than seventy-five models based on measurements form the three gravity-dedicated satellite missions CHAMP, GRACE and GOCE have been made publicly available. Trying to present a comparative analysis of all these models both in the space and spectral domain, a bunch of assessment tools such as correlation or smoothing coefficients per order and degree, signal to noise ratio, gain, degree and order variances and error variances have been used. Moreover, an extended analysis of various gravity field functionals in different geographical regions has been performed. Finally, a comparison of all these models with respect to EGM2008 and various available topographic and topographic/isostatic models reveals the true errors of the models and provides a degree-wise quantification of different features of the observed gravity field.