A Study of Zero-and first-degree terms in geopotential models over Australia
By virtue of the formulation of the boundary value problem of physical geodesy, the zero and first-degree terms in any gravimetrically determined geoid are omitted. With the advent of space-based positioning, notably GPS, geometrical control is now available with which to constrain these terms. Furt...
| Main Authors: | , |
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| Format: | Journal Article |
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Institution of Surveyors, Australia
1997
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| Online Access: | http://www.cage.curtin.edu.au/~will/gra66_06.pdf http://hdl.handle.net/20.500.11937/44371 |
| Summary: | By virtue of the formulation of the boundary value problem of physical geodesy, the zero and first-degree terms in any gravimetrically determined geoid are omitted. With the advent of space-based positioning, notably GPS, geometrical control is now available with which to constrain these terms. Furthermore, the fit of a geopotential model gravity field to the terrestrial gravity field can also give some indication as to the magnitude of the zero-degree term. This investigation compares a series of global geopotential models with absolute geometrically-determined geoid heights derived from the Australian Fiducial Network and terrestrial gravity anomalies from the Australian gravity data-base in order to deduce the magnitude of these terms in the Australian context. |
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