Quasigeoid-to-geoid determination by EGM08

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• 作者：L. E. Sj?berg (1) lsjo@kth.se
  M. Bagherbandi (1)
• 关键词：Geoid – Quasi‐geoid – EGM08
• 刊名：Earth Science Informatics
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：5
• 期：2
• 页码：87-91
• 全文大小：381.7 KB
• 参考文献：1. Bassin C, Laske G, Masters TG (2000) The current limits of resolution for surface wave tomography in North America. EOS Trans AGU 81:F897
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  6. 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
  7. Sj?berg 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
  8. Sj?berg LE (2007) The topographic bias by analytical continuation in physical geodesy. J Geod 81:345–350
  9. Sj?berg LE (2010) A strict formula for geoid-to-quasigeoid separation. J Geod 84(11):699–702. doi:
  10. Sj?berg LE (2012) The geoid-to quasigeoid difference using an arbitrary gravity reduction model. Stud Geophys Geod 56 (on-line first)
• 作者单位：1. Division of Geodesy and Geoinformatics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Computer Applications in Geosciences
  Geosciences
  Simulation and Modeling
  
• 出版者：Springer Berlin Heidelberg
• ISSN：1865-0481

文摘

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.