| Abstract: | One of the main objectives of geodesy is to establish a framework of well distributed points (geodetic control points). The coordinates of these points should be known with sufficient accuracy in order to detect any crustal movement and to be also used in any application of geodynamics. These in turn need a better defined geodetic datum.Unfortunately, in Egypt such datum has not yet been adopted due to the lack in geodetic observations. The adopted ellipsoid is not the best or even a good fit to the geoid in Egypt. Therefore, the geodetic observations have not been completely and rigorously reduced to the reference ellipsoid. The network suffers from a fairly large distortion in scale and orientation. Quite a part of that distortion is due to the lack in reducing such observations. The objective of this paper is to review both the available geodetic data and to propose an approach to achieve a well defined geometric datum. Such approach should use all types of geodetic observations (astro-gravity-Doppler) in a combined study using a least squares collocation technique. |
