Enhancing the Integrity of the National Geodetic Data Bases in Egypt
نویسندگان
چکیده
Egypt has recentely established a new precise geodetic framework based on the global WGS84 datum to furnish a national GPS-based reference system. For agricultural development along the Nile valley, the National Agricultural Cadastral Network (NACN) has been established with a precision of 1 part per million. However, the orthometric heights of the 112-station network have been computed utilizing the OSU91A global geopotential model. Previous studies have shown that the accuracy of this model over Egypt is almost 1.5 meter. Even the new global models, such as EGM96, PGM2000, and UCPH2002, do not represent the gravitational field over Egypt better than 0.80 meter.
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