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Crossover Adjustment of New Zealand Marine Gravity Data, and Comparisons with Satellite Altimetry and Global Geopotential Models

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Authors
Amos, Matthew
Featherstone, Will
Brett, J.
Date
2005
Type
Conference Paper

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Citation
Amos, Matthew and Featherstone, Will and Brett, J. 2005. Crossover Adjustment of New Zealand Marine Gravity Data, and Comparisons with Satellite Altimetry and Global Geopotential Models, in Christopher Jekeli, Luisa Bastos, Joana Fernandes (ed), GGSM 2004: IAG International Symposium, Aug 30 2004, pp. 266-271. Porto, Portugal: Springer.
Source Title
Gravity, Geoid and Space Missions
Source Conference
GGSM 2004: IAG International Symposium
DOI
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Faculty
Department of Spatial Sciences
Faculty of Science and Engineering
WA School of Mines
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The original publication is available at : http://www.springerlink.com

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Abstract

This paper summarises the crossover adjustment of approximately 90,000-line-km of ship-track gravity observations around New Zealand. The adjustment reduced the standard deviation of the ~106 crossovers from ~2.0 mgal to ~0.3 mgal. These data were then used to assess four different grids of satellite-altimeter-derived gravity anomalies. The KMS02 altimeter grid was selected for use around New Zealand as it gave a better fit to the coastal ship-track data. Least-squares collocation was then used to 'drape' the altimetry onto the crossover-adjusted ship-tracks to counter the well-known problems with satellite altimeter data near the coast. The precision of this merged ship-altimeter gravity dataset is estimated to be 3.5 mgal.