A Better Match Of The EGM96 Harmonic Model For The Egyptian Territory Using Collocation A Digital Elevation Model for Egypt by Collocation A Precise Geoidal Map of the Southern Part of Egypt by Collocation Toshka Geoid Accuracy Assessment of world DEMs versus Local DEM in Egypt DRAWING ACCURATE AND PRECICE MAPS OF THE DEFLECTION OF THE VERTICAL COMPONENTS F0R EGYPT BASED ON HETROGENEOUS GRAVITY FILED DATA Evaluation and Spectral Analysis of a Locally Refined EGM96 “EGM96EGR” Harmonic Model Fetching the Most Appropriate Global Geopotential Model for Egypt Improving Accuracy and Increasing Resolution of the World and Local DEMs through Data fusion The “EGM96EGIT” Geopotential Model Tailored to Egypt by the Stokes’ Integral Technique Two Techniques Of Tailoring A Global Harmonic Model: Operational Versus Model Approach Applied To The Egyptian Territory