Comparison of Different Satellite Altimeter-Derived Gravity Anomaly Grids with Ship-Borne Gravity Data Around Australia
MetadataShow full item record
The GMGA97, KMS01 and Sandwell's v.9.2 grids of marine gravity anomalies, derived from multi-mission satellite altimetry, are compared with one another and with ship-track gravity anomalies computed from the Australian marine gravity database. The results show some significant differences among these data sources, especially close to the coasts and in regions of steep horizontal gravity gradients, such as along the continental shelf. These are attributed to loss of altimeter lock as it passes over the coast and poorly modelled shallow-sea tides, and data interpolation errors, respectively. The comparisons also show that there are some serious biases among ship-tracks in the Australian marine gravity database, which illus-trates that these data have not been crossover cor-rected properly. Therefore, users of any of these data should treat them with caution.
Showing items related by title, author, creator and subject.
An evaluation of FFT geoid determination techniques and their application to height determination using GPS in Australia.Zhang, Kefei (1997)A new, high resolution, high precision and accuracy gravimetric geoid of Australia has been produced using updated data, theory and computational methodologies. The fast Fourier transform technique is applied to the ...
Amos, Matthew (2007)One goal of modern geodesy is the global unification of vertical datums so that height data from them can be properly integrated. This thesis studies the unification of the 13 disparate levelling- and tide-gauge-based ...
Abeyratne, P.; Featherstone, Will; Tantrigoda, D. (2009)The tide-free EGM2008 combined global geopotential model is compared with land and marine gravity observations and co-located GPS-levelling on and around Sri Lanka (formerly Ceylon). Not all these data are in the public ...