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In the current study, the global geopotential harmonic models are used to densify gravity values along precise leveling routes, and hence to minimize the discretization error in computing the orthometric correction and to represent an economical alternative. Furthermore, these models are checked regarding their capability of being the only source of gravity information along spirit leveling lines. The orthometric corrections, computed for two simulated test links, are compared with those resulting from using purely observed gravity. Based on the obtained results, it is recommended to use the geopotential harmonic models as an economical source of gravity information along precise levelling routes. Moreover, it is recommended to investigate the application of the remove-restore technique of geopotential models in the computation of orthometric correction. .ةقٌقدلا ةٌنازٌملا تاراسم ىلع ةٌبذاجلا داصرأ مٌق فٌثكت ًف ةٌضرلأا ةٌبذاجلا لاجم جذامن مادختسا مت ،ثحبلا اذه ًف انلا أطخلا لٌلقت ىلا فدهٌ اذه اٌداصتقا لاٌدب لثمٌ اضٌأو يرتموثرلأا حٌحصتلا باسح ًف يددعلا لماكتلا مادختسا نع جت مٌقل دٌحولا ردصملا اهنوك ًف ةٌقفاوتلا جذامنلا هذه ةءافك نم ققحتلا مت اضٌأو .ةرٌغص ةٌنٌب تافاسم ىلع ةٌبذاجلا داصرلأ حصتلا مٌقب جئاتنلا تنروق دقو .ةٌنازٌملا تاراسم ىلع ةٌبذاجلا كلذو ،طقف ةٌبذاجلا داصرأ نم ةبوسحملا يرتموثرلأا حٌ يداصتقا ردصمك ةٌبذاجلا لاجمل ةٌقفاوتلا جذامنلا مادختساب ىصوٌ ،ثحبلا جئاتن ىلع اءانبو .ةٌنازٌملل نٌٌضارتفا نٌراسمل فذحلا أدبم قٌبطت ًف جذامنلا كلت مادختساب ىصوٌ كلذك .ةٌنازٌملا تاراسم ىلع ةٌبذاجلا تاناٌبل ا باسحل باسح ًف ةفاضلاا .يرتموثرلأا حٌحصتلا

GEOPOTENTIAL MODELS AS A TOOL OF DENSIFYING GRAVITY FOR ORTHOMETRIC CORRECTION COMPUTATION