The IAG approach to the atmospheric geoid correction in Stokes' formula and a new strategy |
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| Authors: | L E Sjöberg |
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| Institution: | (1) Royal Institute of Technology, Department of Geodesy and Photogrammetry, S-100 44 Stockholm, Sweden e-mail: sjoberg@geomatics.kth.se; Tel.: +46 8 7907330; Fax: 46 8 7907343, SE |
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| Abstract: | The well-known International Association of Geodesy (IAG) approach to the atmospheric geoid correction in connection with
Stokes' integral formula leads to a very significant bias, of the order of 3.2 m, if Stokes' integral is truncated to a limited
region around the computation point. The derived truncation error can be used to correct old results. For future applications
a new strategy is recommended, where the total atmospheric geoid correction is estimated as the sum of the direct and indirect
effects. This strategy implies computational gains as it avoids the correction of direct effect for each gravity observation,
and it does not suffer from the truncation bias mentioned above. It can also easily be used to add the atmospheric correction
to old geoid estimates, where this correction was omitted. In contrast to the terrain correction, it is shown that the atmospheric
geoid correction is mainly of order H of terrain elevation, while the term of order H
2 is within a few millimetres.
Received: 20 May 1998 / Accepted: 19 April 1999 |
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| Keywords: | , Atmospheric correction,Atmospheric gravity |
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