The transformation of coordinates between the global coordinate system yield
ellipsoid WGS84 (World Geodetic System 1984) and the local coordinate system yield
ellipsoid Clark1880 in different regions of Syria, is the essential step in the effectiv
e use of
GNSS (Global Navigation Satellite Systems) surveying techniques in Syria, and the
transformation occurs with 3D transformation between one ellipsoid and another, or 2D
transformation directly between two planar. The transformation must be understood,
analyzed and tested. The research is about the accuracy of the 2D transformation in small
area to give coordinates can be directly used in different surveying and engineering works,
and about studying the common points number and their distribution effect on
transformation accuracy, and conclude that the biggest effect on transformation accuracy is
for the common points distribution.
Search includes the geodetic study local network triangulation real estate in Slenfeh
area, and propose a solution for the local network linking public real estate network in
Syria based on a comparison of the 2D-Transformation results so as to cho
ose the optimal
conversion which avoids the occurrence of interactions between regions and schemes real
estate and reduces distortions network after conversion (shift, rotation, scale). At first been
touched to date geodesic network set up in Slenfeh region and the stages of execution, and
the problems of engineering, and then to the transformation methods used in the link, and
apply them to the network, and choose the best conversion, and set parameters optimal
transformation, have been proposed solution depends on the network is divided into three
segments so that Network least deformation resulting from the transformation in each
sector.
A computer program that has been prepared for the implementation of the
transformation and linking local grid points by using the C # programming language.
It has been verified the resultant transformation parameters by comparing linear
measurements calculated from coordinates resulting from the transformation with linear
measurements in the network observation records, and execution field measurements of
some of the points and calculate its coordinates and compare it with the coordinates
calculating fromtransformation.
