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| Titel |
Determination of the normal height of the Everest based on EGM 2008 |
| VerfasserIn |
W. B. Shen, Jin Li, J. Han |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028726
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| Zusammenfassung |
| The orthometric height H is the height above the geoid, which is the equi-geopotential
surface nearest to the mean sea level. The normal height H*, however, is the height above the
quasi-geoid, which fast coincides with the geoid in the ocean but deviates from the geoid a
little in the land areas. In China, the height datum system is based on the quasi-geoid, i.e., in
most cases we use the normal height. GPS technique provides the coordinates of an arbitrary
point P on ground with the accuracy better than 1 cm, in the geocentric Earth-fixed system.
Hence, with the same accuracy, GPS technique provides the geodetic coordinates of the point
P . Then, if the quasi-geoid is determined, the normal height can be subsequently determined.
In the present paper, we focus on the determination of the normal height of the
Everest based on the international gravity field model, EGM 2008. The geodetic
coordinates of the Everest could be obtained by different sources. We use the coordinates
provided by Chinese Surveying Bureau. In the frame of Molodensky theory, based on
EGM 2008 (with degree 2190), we determine the normal height of the Everest by two
approaches: point-wise approach and area-average approach. By point-wise and
area-average approaches, our results show that the normal heights of the Everest are
HEGM2008* = 8847.32 m and HEGM2008* = 8847.37 m, respectively. Concerning the
normal height determination of the Everest, we find that the difference between our
result and the result provided recently by Chinese Surveying Bureau is less than
0.1 m. Using EGM 96 however, we find that the difference is around 1 m. This study
is supported by National 863 Project of China (Grant No.: 2006AA12Z211) and
National Natural Science Foundation of China (Grant No.: 40637034; 40574004). |
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