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Absolute performance of AUSGeoid09 in mountainous regions

Citation

Sussanna, V and Janssen, V and Gibbings, P, Absolute performance of AUSGeoid09 in mountainous regions, Journal of Applied Geodesy, 8, (3) pp. 195-203. ISSN 1862-9016 (2014) [Refereed Article]


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Copyright 2014 Walter de Gruyter GmbH The final publication is available at www.degruyter.com.

DOI: doi:10.1515/jag-2014-0007

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)AHDheights fromGlobalNavigation 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 MidHunter, AUSGeoid09 provided a substantial improvement over its predecessor, clearly demonstrating the benets 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.

Item Details

Item Type:Refereed Article
Keywords:AUSGeoid09, AHD, geoid model, N values, height datum, GNSS
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Environment not elsewhere classified
Author:Janssen, V (Dr Volker Janssen)
ID Code:96372
Year Published:2014
Deposited By:Geography and Environmental Studies
Deposited On:2014-11-03
Last Modified:2016-10-18
Downloads:34 View Download Statistics

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