Document Type : Research Paper

Author

• Abbas Ali Saleh Abadi

Abstract

The Geographic Organization of the Armed Forces, in line with its research in the field of surveying sciences, successfully completed the installation and running of GPS antenna on Fokker and Falcon aircrafts, the implementation of which was announced with the arrival of the twenty-first anniversary of the glorious victory of the Islamic Revolution. The project was conducted with the aim of making implementation of aerial photography using satellite observations of the GPS system possible. In this research project, the experts of the Organization managed to connect the RS-10A RC-10 aerial camera to a new generation of GPS receivers that can receive waves transmitted from Glonass and GPS satellites. The project was implemented while the manufacturers of these types of cameras prevented from carrying it out, considering it impossible to realize. With the implementation of this project, a test flight with the new system was carried out over the Varamin area in Tehran, the results of which were then calculated with appropriate accuracy after processing and analysis of errors of this method. In this test flight, aerial photos taken from the area were calculated with the accuracy of 2 to 3 cm on the computational datum of Iran. This level of accuracy is very satisfying for aerial photography centers that provide photogrammetry cover maps.
However, to ensure the accuracy of the measurements and calculations, the results of aerial triangulation were tested in preparation of 1: 25000 maps, and the results of this comparison were satisfactory. Therefore, it can be argued that by performing aerial photography and triangulation along with GPS, the cost and time of the implementation of common photogrammetric projects fall to a third of their figures when practiced by old methods without causing a problem for the accuracy of cover maps in geographic terms.