Relative performance of AUSGeoid09 in mountainous terrain

Article

Sussanna, V., Janssen, V. and Gibbings, P.. 2016. "Relative performance of AUSGeoid09 in mountainous terrain." Journal of Geodetic Science. 6 (1), pp. 34-42. https://doi.org/10.1515/jogs-2016-0002
Article Title

Relative performance of AUSGeoid09 in mountainous terrain

ERA Journal ID201007
Article CategoryArticle
AuthorsSussanna, V. (Author), Janssen, V. (Author) and Gibbings, P. (Author)
Journal TitleJournal of Geodetic Science
Journal Citation6 (1), pp. 34-42
Number of Pages9
Year2016
Place of PublicationGermany
ISSN2081-9919
2081-9943
Digital Object Identifier (DOI)https://doi.org/10.1515/jogs-2016-0002
Web Address (URL)https://www.degruyter.com/document/doi/10.1515/jogs-2016-0002/html
Abstract

The Australian Height Datum (AHD) is the national vertical datum for Australia, and AUSGeoid09 is the latest quasigeoid model used to compute (normalorthometric) AHD heights from Global Navigation Satellite System (GNSS) derived ellipsoidal heights. While previous studies have evaluated the AUSGeoid09 model across Australia, such studies have generally not focused on mountainous terrain. This paper investigates the performance of AUSGeoid09 in a relative sense in the Mid Hunter and Snowy Mountains regions of New South Wales, from a user’s perspective. Relative (i.e. height difference between two points) comparisons were undertaken between AUSGeoid09-derived heights and official AHD heights. The performance of AUSGeoid09 was compared to its predecessor AUSGeoid98. In both study areas, an overall improvement was evident when applying AUSGeoid09 to compute AHD height differences. AUSGeoid09 generally provided AHD height differences at the ±0.05 m to ±0.09 m level (1 sigma) and substantially increased the percentage of GNSS-derived height differences meeting 3rd order differential levelling specifications. This is a very encouraging result, considering the difficulties of spirit levelling in mountainous terrain and the increasing popularity of GNSS-based height transfer in practice.

KeywordsAUSGeoid09, Australian Height Datum, geoid model, Global Navigation Satellite System, N values, national datums
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401306. Surveying (incl. hydrographic surveying)
401302. Geospatial information systems and geospatial data modelling
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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