The existing Egyptian geodetic network, which dates back to the first decade of the twentieth century, has been studied and adjusted in two and three-dimensions by several researchers. All previous trials showed that there is some kind of distortion due to the inaccurate treatment, adjustment and lake of geoid information. GPS is used extensively in the last decade. GPS is very accurate in its relative (surveying) mode. GPS is used in many projects in Egypt and the coordinates of many triangulation stations are precisely determined in the World Geodetic System 1984 (WGS-84). The idea of this research is to use the available precise coordinates, at some stations of the Egyptian triangulation network, in defining the distortion in the network and to establish a correction model to improve the accuracy of the local network without readjusting the network. |
