Miscellaneous Corrections, Computations and Numerical Examples

Occasionally, some additional EDM corrections are required in order to achieve the collinearity requirements between EDM wave path and zenith angle ray paths which were assumed during the derivation of the geometrical corrections in Sect. 7. A number of approaches to the problem are discussed below. These derivations are followed by the discussion of three EDM-related computational problems, namely the computation of height differences from measured zenith angles and slope distances (EDM-Trigonometric Heighting), the computation of the coefficient of refraction from reciprocal zenith angle (and slope distance) measurements and the centring of measured zenith angles and slope distances from satellite stations to their respective centre stations. This section then concludes with fully worked examples for the reduction to the spheroid of the measurements of a short and a long EDM line.