EGU2020-20380, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-20380
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Effect of topographic potential difference and gravity correction on the geoid-quasigeoid separation

Yan Ming Wang
Yan Ming Wang
  • NOAA/NGS, Geoscience Research Lab, Silver Spring, United States of America (yan.wang@noaa.gov)

The effect of the topographic potential difference and the gravity correction on the geoid-quasigeoid separation are usually ignored in numerical computations. Those effects are computed in a mountainous Colorado region by using the digital elevation model SRTM v4.1 and terrestrial gravity data. The effects are computed at 1′X1′ grid size in the region. The largest effect is the topographic potential difference. It reaches a maximum of 19.0 cm with a standard deviation of 1.8 cm over the whole region. The gravity correction is smaller, but it still reaches a maximum of 3.0 cm with a standard deviation 0.3 cm for the whole region. The combined (ignored) effect ranges from -12.2 to 20.0 cm, with a standard deviation of 1.8 cm for the region. This numerical computation shows that the ignored terms must be taken into account for cm-geoid computation in mountainous regions.

How to cite: Wang, Y. M.: Effect of topographic potential difference and gravity correction on the geoid-quasigeoid separation, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20380, https://doi.org/10.5194/egusphere-egu2020-20380, 2020

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