Geometrical Corrections

Abstract

In principle, the wave path d₁ is obtained after applying the two velocity corrections to an actual observation of the length. Unless the length is subsequently processed in a three-dimensional network adjustment, it has to be reduced to the equivalent spheroidal distance on a geodetic reference surface, for example the Australian Geodetic Datum. Selected methods of reduction to the spheroid will now be reviewed, prior to a discussion of additional corrections and computations.