The development and testing of a high precision ellipsoidal - Australian height datum deformation grid for real time GPS applications

Morrison, Scott James (2010) The development and testing of a high precision ellipsoidal - Australian height datum deformation grid for real time GPS applications. [USQ Project] (Unpublished)

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Abstract

[Abstract]: The aim of this project is to bridge the gap of understanding between the heights produced by Global Positioning Systems (GPS) and their relationship to the Australian Height Datum (AHD). This will be achieved by developing a local geoid model and testing it by utilising global positioning equipment, software, registered state control marks and geodetic surveying principles. The objective of the project is to improve future GPS derived AHD heights and to confirm AHD values of a sample of state control marks within the limitations of a sample area. Global Navigation Satellite Systems (GNSS), notably GPS, have the ability to provide real time corrections and centimetre accuracy for surveying, civil engineering, property development, scientific and various other applications where position, both vertical and horizontal, is required. GPS offers an attractive alternative position determination tool, but only provided that it is sufficiently accurate for the application at hand. This project presents the results of utilising GPS, and software, to improve future GPS derived results of the AHD within the project area and confirm the stated values of AHD on state control marks within the limitations of the project area. GPS has established itself as a competitor to traditional surveying instruments such as the theodolite, electronic total stations, laser levels and spirit levels. GPS is a faster and more efficient tool for surveying applications, especially over large areas, when compared to the latter mentioned traditional instruments. Accurate position is the fundamental component of any built form project. Data is now commonly requested on the national mapping datum, the GDA94 and the AHD. Deriving and transfening AHD heights using GPS is problematic. GPS users in Australia have had access to AUSGeoid98, as a reference geoid, since November 1998. The primary application of a gravimetric geoid model is to convert GPS derived ellipsoid heights to elevations on a local height datum such as AHD. AUSGeoid98 is a gravimetric geoid model developed, at two-arc minute spacing, to align AHD. AHD has deficiencies by virtue of its original establishment as an orthometric derived height system. This represents a considerable gap in the knowledge in the integrity of the AUSGeoid98's realisation of the AHD. The outcomes and results from this project can be used to complement the existing AUSGeoid98's geoid model and therefore increase the accuracy and realisation of AHD by GPS observations within the project area.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Date Deposited: 04 Mar 2011 04:35
Last Modified: 03 Jul 2013 00:32
Uncontrolled Keywords: surveying; global positioning system; GPS; geoid modelling; AUSGeoid98
Fields of Research (FOR2008): 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems
URI: http://eprints.usq.edu.au/id/eprint/18568

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