In the current study, 5'x5' grid values of geoidal heights, for the whole terri-tory of Egypt were computed by collocation technique, based on all the old and the recent available heterogeneous geodetic data. The well-known remove-restore technique was used for the purpose of maximally smoothing the used data as a pre-request by the collocation method. This was done, for the first time in Egypt, by the aid of an appropriate high degree global harmonic model, tailored to the local terrestrial data. A digital terrain model for Egypt was also used for the same purpose. The final results have shown a rather good internal and external accu-racy of the predicted geoid of about 0.22 m and 0.63 m respectively. |
