
%0 Journal Article
%A Featherstone, W.E. 
%T GPS coordinate transformations and their use in gravimetry
%J Exploration Geophysics
%D 1993/12/01
%V 24
%N 4
%P 487-492
%K 
%R https://doi.org/10.1071/EG993487
%U https://www.publish.csiro.au/paper/EG993487 
%X Geodetic coordinates on Australian maps are referenced to the Australian Geodectic Datum 1984 (AGD84). Topographic elevations are referred to the Australian Height Datum (AHD). Conversely, GPS yields 3-D Cartesian coordinates and coordinate differences in the World Geodetic System 1984 (WGS84). The difference between coordinates of the same point on the Earth's surface varies between 150 m to 200 m over continental Australia. This study presents a method of transforming between GPS (WGS84) and AGD84 latitude, longitude and AHD. This permits GPS-aided gravity data to be integrated with other geophysical data referred to the AGD84. A new rigorous formula to simultaneously determine the latitude, free-air and slab Bouguer corrections from GPS and geoid information is derived. It is demonstrated that, if an incorrect elevation datum is used for gravimetric data reduction, a different gravity anomaly is produced. 
