Application of the Wavelet Transform to Isostatic Analyses in Australia. Existing methods of determining the Earth's isostatic response assume ideal but unrealistic conditions. This project will develop a new technique for isostatic analysis, using the two-dimensional wavelet transform. This tool can resolve spectral components of geophysical data in the space domain, thus avoiding the problems arising during the conventional Fourier analysis. With innovative processing methods, maps of the crus ....Application of the Wavelet Transform to Isostatic Analyses in Australia. Existing methods of determining the Earth's isostatic response assume ideal but unrealistic conditions. This project will develop a new technique for isostatic analysis, using the two-dimensional wavelet transform. This tool can resolve spectral components of geophysical data in the space domain, thus avoiding the problems arising during the conventional Fourier analysis. With innovative processing methods, maps of the crustal thickness from gravity and topography data can be generated, a task usually reserved for costly seismic experiments. Analysis of the wavelet power spectrum would also benefit the exploration industry by identifying previously unknown sedimentary basins.Read moreRead less
Validation of Synthetic Regional Gravity Field Models. This research will further develop the theoretical and practical methods required to test any model of the Earth's gravity field. Previously, geodesists have had to rely on analytical error estimates, usually based on observed data. A synthetic Earth gravity model avoids this scenario by giving an exact validation technique of the methods used. The synthetic model will allow users of geoid models (e.g., for GPS heighting) to have much mor ....Validation of Synthetic Regional Gravity Field Models. This research will further develop the theoretical and practical methods required to test any model of the Earth's gravity field. Previously, geodesists have had to rely on analytical error estimates, usually based on observed data. A synthetic Earth gravity model avoids this scenario by giving an exact validation technique of the methods used. The synthetic model will allow users of geoid models (e.g., for GPS heighting) to have much more confidence in their results. When used with a precise geoid model, GPS is faster and cheaper than conventional spirit-levelling, offering around 800% productivity gains. Read moreRead less
Investigations of the Integrity of the Australian Height Datum. The Australian Height Datum (AHD) forms the fundamental framework for all vertical spatial information in Australia. It supports a wide range of applications in areas such as geodesy, surveying, mapping, telecommunications, resource exploration and environmental science. This medium-term research programme will investigate the many issues surrounding the integrity of the AHD, and will rigorously redefine, correct and unify it with ....Investigations of the Integrity of the Australian Height Datum. The Australian Height Datum (AHD) forms the fundamental framework for all vertical spatial information in Australia. It supports a wide range of applications in areas such as geodesy, surveying, mapping, telecommunications, resource exploration and environmental science. This medium-term research programme will investigate the many issues surrounding the integrity of the AHD, and will rigorously redefine, correct and unify it within a global vertical framework. This will provide improved height information to the numerous users of the AHD in Australia, and allow Australia to contribute more fully to the global spatial data infrastructure.Read moreRead less
Ellipsoidal physical geodesy - improved global and local gravity field modelling. Improved techniques for gravity field modelling, using the ellipsoidal approach proposed in this research, will increase the accuracy of the Australian geoid model. A more accurate model of the geoid will bring great cost-benefits mainly to the Australian surveying, mapping and exploration community. For example, height determination from GPS [Global Positioning System] or similar satellite-based measurements is on ....Ellipsoidal physical geodesy - improved global and local gravity field modelling. Improved techniques for gravity field modelling, using the ellipsoidal approach proposed in this research, will increase the accuracy of the Australian geoid model. A more accurate model of the geoid will bring great cost-benefits mainly to the Australian surveying, mapping and exploration community. For example, height determination from GPS [Global Positioning System] or similar satellite-based measurements is only possible with the aid of an accurate geoid model. This will allow the use GPS to its full capacity and save valuable time and money (by as much as a factor of 10).Read moreRead less