Mean Earth'S Equipotential Surface From Topex/Poseidon Altimetry |
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| Authors: | Milan Burša Jan Kouba Karel Raděj Scott A. True Viliam Vatrt Marie Vojtíšková |
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| Affiliation: | (1) Astronomical Institute, Acad. Sci. Czech Republic, Bo!["ccaron"]("/content/h30w55tj5338618g/xlarge269.gif") ní II/1401, 141 31 Prague 4, Czech Republic;(2) Natural Resources Canada, Geodetic Survey Division, 615 Booth Str., Ottawa, KIA, OE9, Canada;(3) Topographical Service of the Army of the Czech Republic, Topographical Institute VTOPÚ, 518 01 Dobru!["scaron"]("/content/h30w55tj5338618g/xlarge353.gif") ka, Czech Republic;(4) National Image and Mapping Agency, St. Louis, MO 63118-3399, USA |
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| Abstract: | The geopotential value of W0= (62 636 855.611 ± 0.008) m2s–2which specifies the equipotential surface fitting the mean ocean surface best, was obtained from four years (1993 - 1996) of TOPEX/POSEIDON altimeter data (AVISO, 1995). The altimeter calibration error limits the actual accuracy of W0to about (0.2 - 0.5) m2s–2(2 - 5) cm. The same accuracy limits also apply to the corresponding semimajor axis of the mean Earth's level ellipsoid a = 6 378 136.72 m (mean tide system), a = 6 378 136.62 m (zero tide system), a = 6 378 136.59 m (tide-free). The variations in the yearly mean values of the geopotential did not exceed ±0.025 m2s–2(±2.5 mm). |
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| Keywords: | geopotential - mean surface – satellite altimetry |
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