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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    
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.

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