View Item 

THe NZGEOID09 model of New Zealand

Access Status
Open access
Authors
Claessens, Sten
Hirt, Christian
Amos, Matthew
Featherstone, Will
Kirby, Jonathan
Date
2011
Type
Journal Article

Metadata
Show full item record
Citation
Claessens, Sten and Hirt, Christian and Amos, Matthew and Featherstone, Will and Kirby, Jonathan. 2011. The NZGEOID09 model of New Zealand. Survey Review. 43 (319): pp.2-15.
Source Title
Survey Review
ISSN
Faculty
Department of Spatial Sciences
Faculty of Science and Engineering
WA School of Mines
Remarks

© W. S. Maney & Son Ltd

URI
Collection
Abstract

The NZGeoid09 gravimetric quasigeoid model of New Zealand was computed through FFT-based Stokesian integration with a deterministically modified kernel and an iterative computation approach 13 that accounts for offsets among New Zealand's 13 different local vertical datums (LVDs). NZGeoid09 is an improvement over the previous NZGeoid05 due to use of the EGM2008 and DNSC08GRA models, and due to improvements to the data processing strategy. The integration parameters of degree of kernel modification L=40 and cap radius = 2.5 were determined empirically through a comparisonwith 1422 GPS/levelling observations, after the LVD offsets had been removed. The precision of NZGeoid09 was assessed using the same GPS/levelling dataset, yielding an overall standard deviation of 6.2 cm. NZGeoid09 performs better than NZGeoid05 and marginally better than EGM2008, but few data are available in the Southern Alps of New Zealand to give a better evaluation.