Study of the Effect of the Geometrical Correction of the Satellite Image on the Global Positioning System Tracking by Using Geographical Information System

The use of global positioning system (gps) for geometrical correction (rectification) of the satellite imagery aims to establish the relation between the image coordinate system and the gps readout coordinate system. by using this technique, the errors existing within satellite image can be calibrated and reduced as well. this paper introduces application of geographical information system (gis) and image processing software in addition to gps for measuring the coordinates of waypoints to be as ground control points (gcps) for the geometrical correction process of the quickbird satellite image for the adopted study area (mosul city). for comparison purpose, the geodetic rectification process was also done for the adopted quickbird satellite image with respect to the ikonos imagery. due to the low standards in the geometric design characteristics of the road which badly affected the gps measurements, the output results show that the geodetic rectification of the quickbird imagery with respect to ikonos satellite image gives more accuracy of results than gcp acquired by gps. the overall procedure applied in the present study shows the ability to give an improvement in the positional accuracy of an already georeferenced coordinate system of the quickbird image which in turn gives a higher accuracy of the gps tracking path for the purpose of mapping, urban planning, cartography, survey and other gis applications .