DOI: 10.36347/sjet.2018.v06i01.004

Pages: 22-30

Due to the evolution of global positioning technologies through satellites and global coordinate system appears as a database that is dependable in all engineering fields, that spatial data (maps, networks, engineering projects). Iraq has no (datum) conjointly with the global system but local, therefore the need to link the local coordinate system (reference ellipsoid (Clarke 1880)) with (WGS 84) .It is difficult to use modern equipments in engineering projects , planning and satellite images Built on the basis of global systems (WGS84). The process of linking the two systems requires data in both systems it needs the coordinates of the national network of Geodetic (Clarke 1880) and the coordinates of the same points in the global system (WGS84) that are monitored in some way Geodetic Model using DGPS to synchronize with at least three CORS stations, and special software to get accurate coordinates. Ten selected sectors (100 * 100) km chosen around the area of Iraq ,four ground control points on each sector are observed on both local coordinates system(Clarke 1880,ITRF00) using (Adjust program) software to calculate the parameters of transformation between two systems by(Helmert Method/7-parameters) .In order to check the accuracy of these parameters another control point(5th one ) which coordinates prevesouly observed by GPS technich(ITRFOO) can be transfere to local system using above seven-parameters and compared the results. By applying the equations (Helmert Method/7-parameters) has access to accurate results up to (0.01-0.002) m.