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Regional Models

Hawaiian Islands (USGG09/GEOID09)

  Authors: D.R. Roman, Y.M. Wang     Created: 2009    Resp: D.R. Roman  
      Status: PUBLIC    

USGG2009 is a gravimetric geoid model for Hawaiian Islands computed by the National Geodetic Survey (NGS). It is referred to the GRS80 normal ellipsoid in the ITRF00 frame. It has a 1'x1' spatial resolution in latitude and longitude. It is based on terrestrial and ship-borne surface gravity data from the NGS database and DNSC08 altimetry-derived gravity over the oceans. The geoid determination is performed in the framework of a remove-restore procedure, where long wavelengths come from the EGM2008 geopotential model. In particular the USGG2009 model is based on the use of the one-dimensional spherical Fast Fourier Transform (FFT) with a modified Stokes kernel that retained all signal below degree 120 from EGM2008. The digital elevation model used for the terrain correction has a 3"x3" spatial resolution and it is mainly based on SRTM-DTED1. The GEOID09 model is also computed for Hawaiian Islands, but unlike the grids for the conterminous United States and the other outlying regions, this model does not incorporate GPS/levelling data. It is derived from the USGG2009 model for Hawaiian Islands by changing the reference frame of the GRS80 normal ellipsoid to the NAD83(PAC00) frame.

Y.M. Wang, J. Saleh, X. Li, D.R. Roman (2012). The US Gravimetric Geoid of 2009 (USGG2009): model development and evaluation. Journal of Geodesy, 86(3), pp. 165-180.
D.R. Roman, Y.M. Wang, J. Saleh, X. Li. (2010). Geodesy, geoids, and vertical datums: A perspective from the US National Geodetic Survey. Proceedings of the FIG Congress 2010, Facing the Challenges - Building the Capacity Sydney, Australia.
D.R. Roman, Y.M. Wang, J. Saleh, X. Li. (2009). Final National Models for the United States: Development of GEOID09. Technical Report, NOAA/National Geodetic Survey.
D.R. Roman, Y.M. Wang, J. Saleh, X. Li. (2009). A Gravimetric Geoid Model for the United States: The Development and Evaluation of USGG2009. Technical Report, NOAA/National Geodetic Survey.