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Regional Models

New Zealand (NZGeoid2017)


  Authors: J.C. McCubbine, et al.     Created: 2017    Resp: J.C. McCubbine (Geoscience Australia) 
      Status: PUBLIC    
Description:
This is a gravimetric quasi-geoid model for New Zealand covering the region 25°S - 60°S and 160°E - 170°W, with a spatial resolution of one arc-minute. It is referred to the GRS80 ellipsoid, in the NZGD2000 geodetic datum. It is based on gridded gravity data derived from 40,677 land gravity observations, satellite altimetry-derived marine gravity anomalies, historical shipborne marine gravity observations and approximately one million airborne gravity observations. Datasets were combined via least squares collocation through a logarithmic covariance function. The NZGeoid2017 quasi-geoid model was computed by Wong and Gore modified Stokes integration using the remove-compute-restore technique with the EIGEN-6C4 global gravity model as the reference field. The resulting model shows a nominal accuracy of ±48 mm when comparing it with 1442 GPS-levelling data, after correcting 13 local vertical datum biases.

References:
J.C. McCubbine, M.J. Amos, F.C. Tontini F.C., E. Smith, R. Winefied, V. Stagpoole, W.E Featherstone (2018). The New Zealand gravimetric quasigeoid model 2017 that incorporates nationwide airborne gravimetry. Journal of Geodesy, 92(8), pp. 923-937.DOI: 10.1007/s00190-017-1103-1

New Zealand