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Performance of AUSGeoid09 in NSW
Citation
Janssen, V and Watson, T, Performance of AUSGeoid09 in NSW, Proceedings of APAS 16th Annual Conference, 2011, 6-7 April 2011, Bathurst, pp. 27-36. (2011) [Non Refereed Conference Paper]
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Copyright Statement
Copyright 2011 Land and Property Management Authority, NSW
Abstract
In March 2011 Geoscience Australia released AUSGeoid09, an improved geoid model for
Australia to relate GNSS-derived ellipsoidal heights to the Australian Height Datum
(AHD71) and vice versa. This paper briefly reviews the theory of GNSS-based height
determination and illustrates that the absolute accuracy of N values is increasingly important
for users of Global Navigation Satellite System (GNSS) Continuously Operating Reference
Station (CORS) networks. In order to quantify the expected improvement of replacing the
current geoid model, AUSGeoid98, with AUSGeoid09 in New South Wales (NSW), four tests
were performed. These tests investigated how well the two geoid models fit known AHD71
heights, based on (1) about 500 AUSPOS solutions, (2) 38 CORSnet-NSW sites, (3) several
GNSS-based adjustments, and (4) numerous height control points from these adjustments. It
was found that AUSGeoid09 provides a considerably improved fit to AHD71 for GNSS-based
height transfer in NSW. In most cases the AUSGeoid09-derived height results fall within the
expected ±0.05 m accuracy stated by Geoscience Australia. It is also shown that the
magnitude of N values in NSW will change by up to 0.5 m when AUSGeoid09 is introduced in
order to provide a better fit to AHD71. The NSW Land and Property Management Authority
(LPMA) has adopted AUSGeoid09 for all operations and urges all spatial professionals to do
the same.
Item Details
Item Type: | Non Refereed Conference Paper |
---|---|
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
Objective Group: | Natural hazards |
Objective Field: | Natural hazards not elsewhere classified |
UTAS Author: | Janssen, V (Dr Volker Janssen) |
ID Code: | 68989 |
Year Published: | 2011 |
Deposited By: | Geography and Environmental Studies |
Deposited On: | 2011-04-13 |
Last Modified: | 2014-06-02 |
Downloads: | 242 View Download Statistics |
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