Baltic Region and Nordic Area (NKG2015)
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Authors: J. Ågren, et al.
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Created: 2015
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Resp: J. Ågren
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Description:
The NKG2015 gravimetric quasigeoid model for the Nordic-Baltic countries has been developed by the Nordic Geodetic Commission (http://www.nordicgeodeticcommission.com/).
It is referred to the GRS80 ellipsoid (ETRF2000 frame, epoch 2000.0) and it extends from 53°N to 73°N and from 0°E to 34°E with a grid spacing of 0.6'x1.2'.
With respect to the previous NKG2004 version, the NKG gravity database has been thoroughly modernized and updated since 2010. A new regional NKG digital elevation model with 3"x3"
resolution has been compiled, along with an ice thickness model derived for the glaciers in Norwegian mountains. A new NKG GNSS/levelling database has also been created.
The NKG2015 quasigeoid determination is based on the least-squares modification of Stokes’ formula with additive corrections (LSMSA) in the framework of a remove-restore procedure,
using the GOCE/GRACE geopotential model GO_CONS_GCF_2_DIR_R5 up to degree and order 300. The resulting model has been fitted to GNSS/levelling data with a 1-parameter transformation and
a permanent tide correction. After that, the NKG2015 quasigeoid model agrees with GNSS/levelling data with a standard deviation of 2.9 cm (1.5-2.0 cm on land).
References:
J. Ågren, G. Strykowski, M. Bilker-Koivula, O. Omang, S. Märdla, R. Forsberg, A. Ellmann, T. Oja, I. Liepinš, E. Paršeliūas, J. Kaminskis, L.E. Sjöberg,
G. Valsson (2015). The NKG2015 gravimetric geoid model for the Nordic-Baltic region. Presented at the 1st Joint Commission 2 and IGFS Meeting, 19-23
September 2016, Thessaloniki, Greece.
Web of Science ID:
DRCI:DATA2018076013172045
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