Updated: 28 June 2005

AUSGeoid Data Format

AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places. AUSGeoid98 deflections of the vertical were computed from the geoid-ellipsoid separation surface, while the AUSGeoid93 deflections of the vertical were computed from OSU91A.

(a)	(b)	(c)	(d)	(e)	(f)
GEO	51.293	S10 10 0.000	E129 0 0.000	2.39	-2.60
GEO	51.007	S10 0 0.000	E129 0 0.000	5.49	-3.06

(a)	Geoid record indicator
(b)	GRS80/WGS84 N Value (metres)
(c)	Latitude (GDA94/WGS84 - degrees, minutes & seconds)
(d)	Longitude (GDA94/WGS84 - degrees, minutes & seconds)
(e)	Deflection of the vertical in the meridian (sec) where the deflection is defined as 'astro' latitude minus 'geodetic' latitude (positive north, negative south)
(f)	Deflection of the vertical in the prime vertical (secs) where the deflection is defined as ('astro' longitude minus 'geodetic' longitude)*Cos(latitude) - (positive east, negative west)

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For more information contact: geodesy@ga.gov.au