Thu Apr 10, F. Flechtner
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Slobbe, Cornelis, Klees, Roland, Farahani, Hassan H., Huisman, Lennard, Alberts, Bas, Voet, Pierre, and Doncker, Filip De, 2019. The Impact of Noise in a GRACE/GOCE Global Gravity Model on a Local Quasi-Geoid. Journal of Geophysical Research (Solid Earth), 124(3):3219–3237, doi:10.1029/2018JB016470.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2019JGRB..124.3219S,
author = {{Slobbe}, Cornelis and {Klees}, Roland and {Farahani}, Hassan H. and {Huisman}, Lennard and {Alberts}, Bas and {Voet}, Pierre and {Doncker}, Filip De},
title = "{The Impact of Noise in a GRACE/GOCE Global Gravity Model on a Local Quasi-Geoid}",
journal = {Journal of Geophysical Research (Solid Earth)},
keywords = {geoid, weighted least squares, spherical radial basis functions, GPS/leveling, satellite-only global gravity model},
year = 2019,
month = mar,
volume = {124},
number = {3},
pages = {3219-3237},
abstract = "{We present a local quasi-geoid (QG) model which combines a satellite-
only global gravity model with local data sets using weighted
least squares. The QG is computed for an area comprising the
Netherlands, Belgium, and the southern North Sea. It uses a two-
scale spherical radial basis function model complemented by bias
parameters to account for systematic errors in the local gravity
data sets. Variance factors are estimated for the noise
covariance matrices of all involved data sets using variance
component estimation. The standard deviation (SD) of the
differences between the computed QG and GPS/leveling data is
0.95 and 1.52 cm for the Netherlands and Belgium, respectively.
The fact that the SD of the control data is about 0.60 and 1.20
cm for the Netherlands and Belgium, respectively, points to a
lower mean SD of the computed QG model of about 0.7 cm for the
Netherlands and 1.0 cm for Belgium. The differences to a QG
model computed with the remove-compute-restore technique range
from -5.2 to 2.6 cm over the whole model domain and from -1.5 to
1.5 cm over the Netherlands and Belgium. A variogram analysis of
the differences with respect to GPS/leveling data reveals a
better performance of the computed QG model compared to a
remove-compute-restore-based QG model for wavelengths >100 km
for Belgium but not for the Netherlands. The latter is due to
the fact that at the spatial scales resolved by the global
gravity model, variance component estimation assigns
significantly lower weights to the local data set in favor of
the global gravity model.}",
doi = {10.1029/2018JB016470},
adsurl = {https://ui.adsabs.harvard.edu/abs/2019JGRB..124.3219S},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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