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Numerical aspects of EGM08-based geoid computations in Fennoscandia regarding the applied reference surface and error propagation
University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering.
2013 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 96, p. 28-32Article in journal (Refereed) Published
Abstract [en]

So far the recent Earth's gravity model, EGM08, has been successfully applied for different geophysical and geodetic purposes. In this paper, we show that the computation of geoid and gravity anomaly on the reference ellipsoid is of essential importance but error propagation of EGM08 on this surface is not successful due to downward continuation of the errors. Also we illustrate that some artefacts appear in the computed geoid and gravity anomaly to lower degree and order than 2190. This means that the role of higher degree harmonics than 2160 is to remove these artefacts from the results. Consequently, EGM08 must be always used to degree and order 2190 to avoid the numerical problems. © 2013 Elsevier B.V.

Place, publisher, year, edition, pages
2013. Vol. 96, p. 28-32
Keywords [en]
Artefact, Downward continuation, Ellipsoid, Error propagation, Signal and error degree variances, Sphere
National Category
Geophysics
Identifiers
URN: urn:nbn:se:hv:diva-5569DOI: 10.1016/j.jappgeo.2013.06.011ISI: 000324357200005Scopus ID: 2-s2.0-84880431933ISBN: 09269851 (ISSN) (print)OAI: oai:DiVA.org:hv-5569DiVA, id: diva2:642579
Available from: 2013-08-22 Created: 2013-08-13 Last updated: 2017-12-06Bibliographically approved

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