Open AccessThe Geocentric Orientation Vector for the Australian Geodetic Datum
Author(s) -
Mather R. S.
Publication year - 1971
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1971.tb03583.x
Subject(s) - geodetic datum , geoid , geocentric model , geodesy , orientation (vector space) , ellipsoid , set (abstract data type) , geology , mathematics , computer science , geophysics , geometry , measured depth , programming language
Summary The geocentric orientation vector is defined for the Australian Geodetic Datum on the assumption that the geoid has the same potential as the value on Reference Ellipsoid 1967 on adopting Reference System 1967. It is shown that only the free air geoid need be considered to provide the required definition in the Australian region with a precision equivalent to that of the data set currently available. Solutions obtained by two different techniques indicate that the parameters required to define the vector at the Johnston origin of the datum areThe error estimate in the last parameter also assumes that no significant errors exist in low degree harmonics of degree n (< 5) and orders zero and one used in the representation of the Earth's gravity field. Such errors cannot be detected over the 2 per cent of the Earth's surface area included in the present study. The consequent errors are unlikely to exceed ± 3 m on current estimates of the accuracy of low degree harmonic coefficients.