Summary

Results of a preliminary gravimetric geoid computed on the Geodetic Reference System of 1967 (GRS67) are given in the form of undulation and deflection maps. For the computations, 1 " x 1 " mean free-air gravity anomalies formed the inner zone and 5 " equal area values the outer zone around each com-putation point. Some of the required 1 " x 1 " means, together with their accuracies, were obtained by statistical prediction methods using an auto-covariance function derived from the known 1 " x 1 " values. The results confirm the general south-easterly down slope of the geoid undulations. The average computed standard errors are about 3.6 m in the undulations and Oe"6 in the deflections. 1