The Nzgeoid09 Model of New Zealand
نویسندگان
چکیده
The NZGeoid09 gravimetric quasigeoid model of New Zealand was computed through FFT-based 11 Stokesian integration with a deterministically modified kernel and an iterative computation approach 12 that accounts for offsets among New Zealand’s 13 different local vertical datums (LVDs). NZGeoid09 is 13 an improvement over the previous NZGeoid05 due to use of the EGM2008 and DNSC08GRA models, 14 and due to improvements to the data processing strategy. The integration parameters of degree of 15 kernel modification L=40 and cap radius 0=2.5 ̊ were determined empirically through a comparison 16 with 1422 GPS/levelling observations, after the LVD offsets had been removed. The precision of 17 NZGeoid09 was assessed using the same GPS/levelling dataset, yielding an overall standard deviation 18 of 6.2 cm. NZGeoid09 performs better than NZGeoid05 and marginally better than EGM2008, but few 19 data are available in the Southern Alps of New Zealand to give a better evaluation. 20 21
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