Sussanna, Vittorio (2013) AUSGeoid09 performance in mountainous regions. [USQ Project]
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Abstract
The Australian Height Datum 1971 (AHD71) is the current national vertical datum for Australia. AUSGeoid09 is the latest geoid model of an equipotential surface used to
compute AHD71 heights (orthometric height) from ellipsoidal heights. This research reviews the theory of GNSS heightening to investigate the performance of AUSGeoid09
to derive AHD71 heights within the Snowy Mountains and Mid Hunter mountainous
regions in NSW.
Absolute (i.e. single point) and relative (i.e. height difference between two points) sense comparisons were employed between geoid-derived heights and published AHD71. The improvement of AUSGeoid09 was evaluated as a function of difference between the AUSGeoid09 and AUSGeoid98. The result of both cases of study has confirmed an overall improvement in retrieving AUSGeoid09-derived AHD71 heights compared to AUSGeoid98 both in absolute and relative sense. However, the Snowy Mountains study area has outlined only a little improvement in absolute sense. Additionally, a possible slight slope within the AUSGeoid09 model was detected. This was evident when the residuals were plotted in their horizontal position; there was an improvement in the performance of the model in one particular direction indicating a possible slope in the AUSGeoid09 model in this specific region. This was not as evident in the Hunter
region. The results have been positive in the last two decades where, GNSS technology has been used to carry vertical survey control. However, the continuous increase use of GNSS will eventually reach a stage where a new vertical datum will be necessary to create homogeneity.
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| Item Type: | USQ Project |
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| Item Status: | Live Archive |
| Additional Information: | Bachelor of Spatial Science project. |
| Faculty/School / Institute/Centre: | Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021) |
| Supervisors: | Gibbings, Peter; Janssen, Volker |
| Date Deposited: | 27 Feb 2014 05:01 |
| Last Modified: | 19 Jul 2018 00:22 |
| Uncontrolled Keywords: | AUSGeoid09 performance; mountainous regions; AHD71 |
| Fields of Research (2008): | 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying) 09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems |
| Fields of Research (2020): | 40 ENGINEERING > 4013 Geomatic engineering > 401306 Surveying (incl. hydrographic surveying) 40 ENGINEERING > 4013 Geomatic engineering > 401302 Geospatial information systems and geospatial data modelling |
| URI: | https://sear.unisq.edu.au/id/eprint/24625 |
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