Absolute performance of AUSGeoid09 in mountainous regions

Article

Sussanna, Vittorio, Janssen, Volker and Gibbings, Peter. 2014. "Absolute performance of AUSGeoid09 in mountainous regions." Journal of Applied Geodesy. 8 (3), pp. 195-204. https://doi.org/10.1515/jag-2014-0007
Article Title

Absolute performance of AUSGeoid09 in mountainous regions

ERA Journal ID39857
Article CategoryArticle
AuthorsSussanna, Vittorio (Author), Janssen, Volker (Author) and Gibbings, Peter (Author)
Journal TitleJournal of Applied Geodesy
Journal Citation8 (3), pp. 195-204
Number of Pages10
Year2014
Place of PublicationGermany
ISSN1862-9016
1862-9024
Digital Object Identifier (DOI)https://doi.org/10.1515/jag-2014-0007
Web Address (URL)https://www.degruyter.com/document/doi/10.1515/jag-2014-0007/html
Abstract

The Australian Height Datum (AHD) is the current national vertical datum for Australia, and AUSGeoid09 is the latest quasigeoid model used to compute (normal-orthometric) AHD heights from Global Navigation Satellite System (GNSS) derived ellipsoidal heights. While previous studies have evaluated the AUSGeoid09 model across Australia, such studies have not focused on mountainous regions in particular. This paper investigates the performance of AUSGeoid09 in an absolute sense in the Mid Hunter and Snowy Mountains regions of New South Wales. Absolute (i.e. single point) comparisons were undertaken between AUSGeoid09-derived heights and published AHD heights. The performance of AUSGeoid09 was evaluated relative to its predecessor AUSGeoid98. In both study areas, an overall improvement is evident when applying AUSGeoid09 to compute AHD heights in an absolute sense. In the Mid Hunter, AUSGeoid09 provided a substantial improvement over its predecessor, clearly demonstrating the benefits of its new geometric component on GNSS-derived AHD height determination. In the Snowy Mountains, moderate improvement over AUSGeoid98 was evident. However, a slope was detected for AUSGeoid09 residuals, and it appears that the geometric component may have overcompensated for sea surface topography in this area. While this appraisal of AUSGeoid09 performance in mountainous regions is encouraging, it has been shown that some discrepancies still remain between AUSGeoid09-derived heights and AHD. Eventually, a new vertical datum will be necessary to ensure homogeneity across Australia.

KeywordsAUSGeoid09; AHD; geoid model; N values; height datum; GNSS
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020409902. Engineering instrumentation
379999. Other earth sciences not elsewhere classified
370603. Geodesy
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Byline AffiliationsDepartment of Finance, Services and Innovation, New South Wales
Faculty of Health, Engineering and Sciences
Institution of OriginUniversity of Southern Queensland
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