AUSGeoid Data Format

AUSGeoid09 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid98 and AUSGeoid93 data files. AUSGeoid09 data files show the AHD-ellipsoid (GDA94) separation to 3 decimal places and deflections of the vertical were computed from the AHD-ellipsoid separation surface.

(a) (b) (c) (d) (e) (f)
GEO 33.791 S20 0 0.000 E135 0 0.000 -4.19 -2.19
(a) Geoid record indicator
(b) AHD - ellispoid (GDA94) separation, N Value (metres)
(c) Latitude (GDA94) - degrees, minutes & seconds
(d) Longitude (GDA94) - 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)