Abstract
We present a method to estimate the difference between quasigeoid and geoid heights globally from the Earth Gravitational Model EGM08 and a related topographic model. The numerical computations with the standard topographic density of 2.67 g/cm3 show that the maximum and minimum of the separations are estimated to 5.47 m and −0.11 m on the Tibet plateau and in the Indian Ocean, respectively. These estimates do not consider possible topographic density variations, which result in topographic bias changes proportional to the topographic elevation squared. Assuming such density changes of 10% from the standard value, the separation may change up to 5 dm.
Similar content being viewed by others
References
Bassin C, Laske G, Masters TG (2000) The current limits of resolution for surface wave tomography in North America. EOS Trans AGU 81:F897
Bott HP (1971) The interior of the earth. Edward Arnold Ltd, London
Flury J, Rummel R (2009) On the geoid–quasigeoid separation in mountain areas. J Geodesy 83:829–847. doi:10.007/s00190-009-0302-9
Heiskanen WA, Moritz H (1967) Physical geodesy. W.H. Freemann and Co, San Francisco and London
Pavlis NK, Factor JK, Holmes SA (2007) Terrain-related gravimetric quantities computed for the next EGM. Presented at the 1st International symposium of the International gravity service 2006, August 28- September 1, Istanbul, Turkey
Pavlis NK, Holmes SA, Kenyon SC, Factor JK (2008) An Earth Gravitational model to degree 2160: EGM08. Presented at the 2008 General Assembly of the European Geosciences Union, Vienna, Austria, April 13–18, 2008
Sjöberg LE (1998) The exterior Airy/Heiskanen topographic-isostatic gravity potential, anomaly and the effect of analytical continuation in Stokes’ formula. J Geod 72:654–662
Sjöberg LE (2007) The topographic bias by analytical continuation in physical geodesy. J Geod 81:345–350
Sjöberg LE (2010) A strict formula for geoid-to-quasigeoid separation. J Geod 84(11):699–702. doi:10.1007/s00190-010-0407-1
Sjöberg LE (2012) The geoid-to quasigeoid difference using an arbitrary gravity reduction model. Stud Geophys Geod 56 (on-line first)
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by: H. A. Babaie
Rights and permissions
About this article
Cite this article
Sjöberg, L.E., Bagherbandi, M. Quasigeoid-to-geoid determination by EGM08. Earth Sci Inform 5, 87–91 (2012). https://doi.org/10.1007/s12145-012-0098-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12145-012-0098-7